WO2013055987A1 - Pyrrolobenzodiazepines and conjugates thereof - Google Patents

Pyrrolobenzodiazepines and conjugates thereof Download PDF

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Publication number
WO2013055987A1
WO2013055987A1 PCT/US2012/059864 US2012059864W WO2013055987A1 WO 2013055987 A1 WO2013055987 A1 WO 2013055987A1 US 2012059864 W US2012059864 W US 2012059864W WO 2013055987 A1 WO2013055987 A1 WO 2013055987A1
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Prior art keywords
antibody
group
conjugate according
conjugate
independently selected
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PCT/US2012/059864
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French (fr)
Inventor
John A. Flygare
Janet L. GUNZNER-TOSTE
Thomas Pillow
Philip Wilson Howard
Luke Masterson
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Spirogen Sàrl
Genentech, Inc.
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Priority to EP12780356.7A priority Critical patent/EP2750713B1/en
Priority to JP2014535895A priority patent/JP6104257B2/en
Priority to SI201230392T priority patent/SI2750713T1/en
Priority to BR112014009050-5A priority patent/BR112014009050B1/en
Priority to ES12780356.7T priority patent/ES2556584T3/en
Priority to EA201490580A priority patent/EA026827B1/en
Priority to NZ623209A priority patent/NZ623209B2/en
Priority to PL12780356T priority patent/PL2750713T3/en
Priority to DK12780356.7T priority patent/DK2750713T3/en
Priority to AU2012322607A priority patent/AU2012322607B2/en
Priority to KR1020147012725A priority patent/KR101877598B1/en
Priority to CA2850371A priority patent/CA2850371C/en
Priority to MX2014004434A priority patent/MX350152B/en
Priority to RS20150839A priority patent/RS54446B1/en
Priority to SG11201401406YA priority patent/SG11201401406YA/en
Priority to CN201280061459.1A priority patent/CN103987407B/en
Application filed by Spirogen Sàrl, Genentech, Inc. filed Critical Spirogen Sàrl
Publication of WO2013055987A1 publication Critical patent/WO2013055987A1/en
Priority to ZA2014/02275A priority patent/ZA201402275B/en
Priority to IL231796A priority patent/IL231796A/en
Priority to HK14108583.0A priority patent/HK1195017A1/en
Priority to HRP20151374TT priority patent/HRP20151374T1/en
Priority to SM201600022T priority patent/SMT201600022B/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6801—Drug-antibody or immunoglobulin conjugates defined by the pharmacologically or therapeutically active agent
    • A61K47/6803—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates
    • A61K47/68035—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates the drug being a pyrrolobenzodiazepine
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D243/00—Heterocyclic compounds containing seven-membered rings having two nitrogen atoms as the only ring hetero atoms
    • C07D243/06—Heterocyclic compounds containing seven-membered rings having two nitrogen atoms as the only ring hetero atoms having the nitrogen atoms in positions 1 and 4
    • C07D243/10—Heterocyclic compounds containing seven-membered rings having two nitrogen atoms as the only ring hetero atoms having the nitrogen atoms in positions 1 and 4 condensed with carbocyclic rings or ring systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
    • A61K47/6849—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a receptor, a cell surface antigen or a cell surface determinant
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
    • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
    • C07D487/04—Ortho-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D519/00—Heterocyclic compounds containing more than one system of two or more relevant hetero rings condensed among themselves or condensed with a common carbocyclic ring system not provided for in groups C07D453/00 or C07D455/00

Definitions

  • the present invention relates to pyrroiobenzodiazepines (PBDs), in particular
  • pyrroiobenzodiazepines having a labile N10 protecting group, in the form of a linker to a cell binding agent.
  • PBDs pyrro!obenzodiazepines
  • Family members include abbeymycin (Hocniowski.. et a/., J. Antibiotics, 40, 145-148 (1987) ⁇ , c icamyein
  • PBDs are of the general structure:
  • DNA, Ai! of the known natural products have an ⁇ -configuration at the cfsirai CI la position which provides them with a right-handed twist when viewed from the C ring towards the A ring. This gives them the appropriate three-dimensional shape for isoheiicity wit the minor groove of 8-forrn DNA, leading to a snug fit at the binding site (Ko n, in Antibiotics Hi.
  • a particularly advantageous pyrro!obenzodiazepine compound is described by Gregson et ai. ⁇ Chem. Common, 1999, 797-798) as compound 1, and by Gregson et a/. (J Med. C em. 2001 , 44, 1161- 174) as compound 4a.
  • This compound also known as SJG-136, is shown below:
  • PBD compounds can be employed as prodrugs by protecting them at the N10 position with a nitrogen protecting group which is removable in vivo (WO 00/12507).
  • nitrogen protecting group which is removable in vivo
  • Many of these protecting groups are carbamates, and are, for example, of the structure: where the asterisk ⁇ *) indicates the attachment point to the N10 atom of the PBD.
  • the present inventors have a!so described the preparation of PBD compounds having a nitrogen carbamate protecting group at the N10 position (WO 2005/023814).
  • the protecting groups are removable from the N10 position of the PBD moiety to leave an N10-GT1 imine bond.
  • a range of protecting groups is described, including groups that can be cleaved by the action of enzymes.
  • WO 2007/085930 describes the preparation of dimer PBD compounds having linker groups for connection to a cell binding agent, such as an antibody. The linker is present in the bridge linking the monomer PBD units of the dimer.
  • ADC antibody-drug conjugates
  • cytotoxic or cytostatic agents i.e. drugs to kill or inhibit tumor cells in the treatment of cancer
  • cytotoxic or cytostatic agents i.e. drugs to kill or inhibit tumor cells in the treatment of cancer
  • systemic administration of these unconjugated drug agents may result in unacceptable levels of toxicity to normal cells as well as the tumor cells sought to be eliminated
  • Drug moieties may impart their cytotoxic and cytostatic effects by mechanisms including tubulin binding, DNA binding, or topoisomerase inhibition. Some cytotoxic drugs tend to be inactive or less active when conjugated to large antibodies or protein receptor ligands.
  • the present inventors have developed a novel approach to forming PBD conjugates with cell binding agents, and in particular PBD antibody conjugates.
  • the present invention provides a conjugate comprising a PBD dimer compound connected through the N10 position via a specific sulfur linker to a cell binding agent
  • the cell binding agent is preferably an antibody.
  • the present invention provides novei conjugate compounds of formuia (A);
  • R D is independently selected from R, C0 2 R, COR, CHO, C0 2 H, and halo;
  • R 6 and R 9 are independently selected from H, R, OH, OR, SH, SR, NH 2 , NHR, NRR',
  • R ? is independently seiected from H, R, OH, OR, SH, SR, NH 2 , NHR, NRR', N0 2 , Me 3 Sn and haio;
  • Y is selected from a single bond, and a group of formulae A1 or A2: where N shows where the group binds to the N10 of the PBD moiety;
  • R ⁇ and R L2 are independently seiected from H and methyl, or together with the carbon atom to which they are bound form a cyclopropylene group;
  • CBA represents a cell binding agent
  • Q is independently selected from O, S and NH;
  • R is either H, or R or, where Q is O, S0 3 M, where M is a metai cation;
  • R and R ! are each independently selected from optionally substituted G-MS aiky!, C3..20 heterocyc!y and C & .3 ⁇ 4> aryj groups, and optionally in relation to the group NRR', R and R' together with the nitrogen atom to which they are attached form an optfonali substituted 4-, 5-, 6- or 7-membered heterocyclic ring;
  • R" is a C ⁇ 2 alky!ene group, which chain may be interrupted by one or more heteroatoms, e.g, O,. S, M(H), N e and/or aromatic rings, e.g. benzene or pyridine, which rings are optionally substituted;
  • X and X ! are independentl selected from O, S and N ⁇ H).
  • formula A is selected from the following formulae A-l, A-ll and A-lil, depending on Y:
  • a second aspect of the present invention pertains to the use of a conjugate of the first aspect to provide a com
  • Q is independently selected from O, S and NH;
  • R 11 is either H s or R or, where Q is O, S0 3 M, where M is a metal cation.
  • a third aspect of the pfesen invention aiso provides compounds of formula (D) for use in the preparation of the conjugate compounds of the invention:
  • ring selected from:
  • V and W are each selected from ⁇ CH 2 ⁇ discipline, O, S, NR, CHR, and CRR * where n is 2 or 3, except that V is C when R and R a t together with the carbon atoms of the C ring to which they are attached, form an optionally substituted benzene ring, and W is C when R 3 and R 2 , together with the carbon atoms of the C ring to which they are attached, form an optionally substituted benzene ring; and
  • T is selected from CH 2 , NR, CO, BH, SO, and S0 2 ;
  • U is selected from OH..., NR, O and S;
  • Y is (CH 2 ) n , where n is 1 , 2, 3 or 4;
  • T, U and Y are not aii CH 2 .
  • the present invention provides a conjugate comprising a PBD dimer connected through the N10 position on one of the PBD moieties via the specified linker to a cell binding agent.
  • the present invention is suitable for use in providing a PBD compound to a preferred site in a subject.
  • the conjugate allows the release of an active PBD compound that does not retain any part of the linker. There is no stub present that could affect the reactivity of the PBD compound.
  • the dotted lines indicate the optional presence of a double bond between C2 and C3, as shown below:
  • a double bond is present between C2 and C3 when R 2 is C f 3 ⁇ 4 aryl C ⁇ . ⁇ 2 a!ky!.
  • the dotted Sines indicate the optional presence of a double bond between C1 and C2, as shown below:
  • a double bond is present between C1 and C2 when R 2 is C 5 . 20 aryl or C-i-12 alkyl.
  • R 2 is independently H.
  • the configuration is configuration (I).
  • R 2 is independently R.
  • R 2 is independently optionally substituted C5-20 aryl.
  • R 2 is independently optionally substituted Ci -12 alkyl.
  • R 2 is independently optionally substituted C 5 . 20 aryl.
  • R 2 is independently optionally substituted C 5 _ 7 aryl.
  • R 2 is independently optionally substituted C 8- io aryl.
  • R 2 is independently optionally substituted phenyl.
  • R 2 is independently optionally substituted thienyl. In one embodiment, R 2 is independently optionally substituted napthyl.
  • R 2 is independently optionally substituted pyridyl.
  • R 2 is independently optionally substituted quinolinyl or isoquinolinyl.
  • R 2 bears one to three substituent groups, with 1 and 2 being more preferred, and singly substituted groups being most preferred.
  • the substituents may be any position.
  • R a is a C->7 aryi group
  • a single substituent is preferably on a ring atom that is not adjacent the bond to the remainder of the compound, i.e. it is preferably ⁇ or y to the bond to the remainder of the compound. Therefore, where the C s . 7 aryi group is phenyl, th substituent is preferably in the meta- or para- positions, and more preferably is in the para- position.
  • R 2 is selected from:
  • R 7 is a C 8 !0 aryi group, for example quinolinyl or isoquinolinyl, it may bear any number of substituents at any position of the quinoline or isoquinoline rings. In some embodiments, it bears one, two or three substiituents, and these may be on either the proximal and distal rings or both (if more than one substituent). in one embodiment, where R 2 is optionally substituted, the substituents are selected from those substituents given in the substituent section below.
  • R is optionaiiy substituted
  • the substituents are preferably selected from:
  • R or R 2 is optionally substituted
  • the substituents are selected from the group consisting of R, OR, SR, NRR', N0 2 , halo, C0 2 R, COR, CONH 2 , CONHR, and CONRR'.
  • R 2 is C-;. :? alkyi.
  • the optional substituent may additionally include C 3 _ 20 heterocyclyl and C 5 . 20 aryl groups.
  • R a is C 3 . ? o heferocyciyi, the optional substituent may additionally include C M2 alkyl and ⁇ 3 ⁇ 4; 3 ⁇ 4 : aryl groups.
  • R 2 is 0 ; .; 3 ⁇ 4 aryl groups
  • the optional substituent may additionally include
  • alkyi encompasses the sub-classes alkenyl and alkynyl as well as cycloalky!.
  • R z is optionally substituted C 1-12 alkyl
  • the alkyl group optionally contains one or more carbon-carbon double or triple bonds, which may form par of a conjugated system, in one embodiment, the optionally substituted C 5 .
  • the C,.. ⁇ aikyi group is a group selected from saturated C 1-12 alkyl, C 2 -i 2 alkenyl, Qj. 1 2 alkynyl and C n cycioalkyi.
  • a substituent on R 2 is halo, it is preferably F or CI, more preferably F.
  • a substitueni on R 2 is ether, it may in some embodiments be an alkoxy group, for example, a C-.; ⁇ alkoxy group (e.g. methoxy, ethoxy) or it may in some embodiments be a aryloxy group fe.g phenoxy, pyrid loxy, furanyloxy).
  • a substituent on R 2 is C-
  • These groups may be bound to the rest of the PSD moiety via the nitrogen atom. These groups may be further substituted, for example, by C- M alkyi groups.
  • ff a substituent on R 2 is bis-oxy-C -3 alkyiene, this is preferably bis-oxy-methytene o bts-oxy- ethylene.
  • Particularly preferred substituents for R 2 include methoxy, ethoxy, fluoro, chloro, cyano, bis- oxy-methylene, metrryi-piperazinyS, morpholino and methyl-thienyl.
  • Particularly preferred substituted R 2 groups include, but are not limited to, 4-methoxy-phenyl, 3-methoxyphenyl, 4-ethoxy-phenyl, 3-ethoxy-phenyl, 4-methyl-phenyl, 4-fluoro-phenyl, 4- chloro-phenyl, 3,4-bisoxymethylene-phenyl, 4-methylthienyl, 4-cyanophenyl, 4- phenoxyphenyl, quinolin-3-yl and quinolin-6-yl, isoquinolin-3-yl and isoquinolin-6-yl, 2-thienyl, 2-furanyl, methoxynaphthyl, and naphthyl.
  • R 2 is halo or dihalo. In one embodiment, R 2 is -F or -F 2 , which substituents are illustrated below as III) and (IV) respectively:
  • R D is independently selected from R, C0 2 R, COR, CHO, C0 2 H, and halo.
  • R D is independently R.
  • R D is independently halo.
  • R 6 is independently selected from H, R, OH, OR, SH, SR, NH 2 , NHR, NRR ⁇ O £ , Me 3 Sn- and Halo. In one embodiment, R 6 is independently selected from H, OH, OR, SH, NH 2 , N0 2 and Halo. In one embodiment, R 6 is independently selected from H and Halo.
  • R 6 is independently H.
  • R 6 and R 7 together form a group -0-(CH 2 ) p -0-, where p is 1 or 2.
  • R 7 R 7 is independently selected from H, R, OH, OR, SH, SR, NH 2 , NHR, NRR', N0 2 , Me 3 Sn and halo.
  • R 7 is independently OR.
  • R 7 is independently OR 7A , where R 7A is independently optionally substituted Ci. e aikyi.
  • R' A is independently optionally substituted saturated C -6 alkyl.
  • R 7A is independently optionally substituted C 2 -4 alkenyl.
  • R 7A is independently Me.
  • R 7A is independently CH 2 Ph.
  • R 7A is independently allyl.
  • R 9 is independently selected from H, R, OH, OR, SH, SR, NH 2 , NHR, NRR ⁇ N0 2 , e 3 Sn- and Halo. in one embodiment, R 9 is independently H.
  • R 9 is independently R or OR.
  • the linking group is removable from the N10 position of the PBD moiety in the conjugate of formula A to leave an N10-C1 1 imine bond, a carbinoiamine, a substituted carbinoiamine, where Q 11 is QSOM, a bisulfite adduct, a tnjocarbinolamine, a substituted
  • the Jinking group is removable from the N10 position of the PBD moiety to leave an 10-C11 imine bond.
  • the specified link between the PBD dimer and the cell binding agent, e.g. antibody, in the present invention is preferably stab!e extracellulariy.
  • the antibody-drug conjugate (ADC) is preferably stable and remains intact, i.e. the antibody remains Sinked to the drug moiety.
  • the linkers are stabie outside the target celi and may be cleaved at some efficacious rate inside the cell.
  • An effective linker will: (i) maintain the specific binding properties of the antibody; (ii) ai!ow intraceiiuiar delivery of the conjugate or drug moiety; (iii) remain stable and intact, i.e.
  • Stability of the ADC may be measured by standard analytical techniques such as mass spectroscopy, HPLC, and the
  • Delivery of the compounds of formulae B or C is achieved at the desited activation site of the conjugates of formula A by the action of an enzyme on the linking group.
  • the S of the conjugate of formula A is linked by a disulfide bond to a free S (active thiol) on the cell binding agent.
  • the linking group may be cleavable by the action of an enzyme.
  • the enzyme is a thioreductase.
  • Certain antibodies have reducible interchain disulfides, i.e. cysteine bridges.
  • Antibodies may be mad reactive for conjugation with linker reagents by treatment with a reducing agent such as DTT (diihiothrestoi).
  • a reducing agent such as DTT (diihiothrestoi).
  • DTT diihiothrestoi
  • Each cysteine bridge will thus form, theoreticaify, two reactive thiol nucieophiies.
  • Additional nucleophiiic groups can be introduced into antibodies through the reaction of lysines with 2-iminothiolane (Traut's reagent) resulting in conversion of an amine into a thiol.
  • Reactive thiol groups may be introduced into the antibody (or fragment thereof ⁇ by introducing one, two, three, four, or more cysteine residues (e.g., preparing mutant antibodies comprising one or more non-native cysteine amino acid residues).
  • US 7521541 teaches engineering antibodies by introduction of reactive cysteine amino acids.
  • R L1 and R L2 are selected from H and methyl, or together with the carbon atom to which they are bound form a cyclopropylene group. In some embodiments, both are H. In other embodiment, both are methyl. In further embodiments, one is H and the other is methyl; in these embodiments, the carbon atom to which they are bound is a chiral centre.
  • Y is a single bond.
  • Y is
  • Y is
  • Q is selected from O, S, or N(H).
  • Q is O.
  • R n is either H, or R or, where Q is O, S0 3 M, where M is a metal cation. in one embodiment, R is H.
  • ! ' is R.
  • R n is SO 3
  • M is a metal cation.
  • the cation may be Na .
  • a cell binding agent may be of an kind, and include peptides and non-peptides. These can include antibodies or a fragment of an antibody that contains at least one binding site, iymphokines, hormones, growth factors, nutrient-transport molecules, or any other cell binding molecule or substance.
  • antibody herein is used in the broadest sense and specifically covers monoclonal antibodies, polyclonal antibodies, dimers, multimers, multispecific antibodies ⁇ e.g., bispecifie antibodies), and antibody fragments, so long as they exhibit the desired biological activity (Miller ei al ⁇ 2003 ⁇ Jou of Immunology 170:4854-4861 ).
  • Antibodies may be murine, human, humanized, chimeric, or derived from other species.
  • An antibody is a protein generated by the immune system that is capable of recognizing and binding to a specific antigen.
  • a target antigen generally has numerous binding sites, also cai!ed epitopes, recognized by CD s on multiple antibodies. Each antibody that specificai!y binds to a different epitope has a different structure. Thus, one antigen may have more than one corresponding antibody.
  • An antibody includes a full-length immunoglobulin molecule or an immunologically active portion of a fui!-!ength immunoglobulin molecule, i.e., a molecule that contains an antigen binding site that immunospecifically binds an antigen of a target of interest or part thereof, such targets including but not limited to, cancer cell or ceils that produce autoimmune antibodies associated with an autoimmune disease.
  • a full-length immunoglobulin molecule or an immunologically active portion of a fui!-!ength immunoglobulin molecule i.e., a molecule that contains an antigen binding site that immunospecifically binds an antigen of a target of interest or part thereof, such targets including but not limited to, cancer cell or ceils that produce autoimmune antibodies associated with an autoimmune disease.
  • immunoglobulin can be of any type (e.g. IgG, igE, Ig . IgO, and igA), class (e.g. SgGI , igG2, igG3, igG4, igA1 and !gA2) or subclass of immunoglobulin molecule.
  • the immunoglobulins can be derived from any species, including human, murine, or rabbit origin.
  • Antibody fragments comprise a portion of a full length antibody, generally the antigen binding or variable region thereof.
  • Examples of antibody fragments include Fab, Fab', F(ab3 ⁇ 4, and Fv fragments; diabodies; linear antibodies; fragments produced by a Fab expression library, antHdiotypic (anti-id) antibodies, CDR (complementary determining region), and epitope-binding fragments of any of the above which immunospecificaify bind to cancer cell antigens, viral antigens or microbial antigens, single-chain antibody molecules; and multispecific antibodies formed from antibody fragments.
  • the term "monoclonal antibody” as used herein refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e.
  • Monoclonal antibodies are highly specific, being directed against a single antigenic site. Furthermore, in contrast to polyclonal antibody preparations which include different antibodies directed against different determinants (epitopes), each monoclonal antibody is directed against a single determinant on the antigen. In addition to their specificity, the monoclonal antibodies are advantageous in that they may be
  • the modifier "monoclonal" indicates the character of the antibody as being obtained from a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method.
  • the monoclonal antibodies to be used in accordance with the present invention may be made by the hybridoma method first described by Kohler ef a/ ⁇ 1975 ⁇ Nature 256:495, or may be made by recombinant DNA methods ⁇ see, US 4818567).
  • the monoclonal antibodies may aiso be isolated from phage antibody libraries using the techniques described in Clackson et a! ⁇ 1991 ⁇ Nature, 352:824-828; Marks et a! (1991 ) J. Mol. Biol., 222:581-597.
  • the monoclonal antibodies herein specifically include "chimeric" antibodies in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain(s) is identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of such antibodies, so long as they exhibit the desired biological activity (US 4816587; and Morrison f a/ (1984) Proc, Natl. Acad. Sci, USA, 81 :6851-6855).
  • Chimeric antibodies include "primatized” antibodies comprising variable domain antigen-binding sequences derived from a non- human primate (e.g. Old Worid Monkey or Ape) and human constant region sequences.
  • an “intact antibody” herein is one comprising a VL and VH domains, as well as a light chain constant domain (CL) and heavy chain constant domains, CH1 , CH2 and CH3.
  • the constant domains may be native sequence constant domains (e.g. human native sequence constant domains) or amino acid sequence variant thereof.
  • the intact antibody may have one or more "effector functions" which refer to those biological activities attributable to the Fc region (a native sequence Fc region or amino acid sequence variant Fc region) of an antibody. Examples of antibody effector functions include C1q binding; complement dependent cytotoxicity; Fc receptor binding; antibody-dependent cell-mediated cytotoxicity (ADCC); phagocytosis; and down regulation of cell surface receptors such as B cell receptor and BCR.
  • intact antibodies can be assigned to different "classes.” There are five major classes of intact antibodies: IgA, IgD, IgE, IgG, and IgM, and several of these may be further divided into “subclasses '* (isotypes), e.g., lgG1 , igG2, IgGS, !gG4, fgA, and lgA2.
  • the heavy-chain constant domains that correspond to the different classes of antibodies are called ⁇ , ⁇ , ⁇ , ⁇ , and ⁇ , respectively.
  • the subunit structures and three-dimensional configurations of different classes of immunoglobulins are well known. Examples of cell binding agents include those agents described for use in WO 2007/085930, which is incorporated herein.
  • the cell binding agent may be, or comprise, a polypeptide.
  • the polypeptide may be a cyclic polypeptide.
  • the cell binding agent may be antibody.
  • the present invention provides an antibody-drug conjugate (ADC).
  • the drug loading is the average number of PBD drugs per antibody.
  • Drug loading may range from 1 to 8 drugs (D) per antibody (Ab), i.e. where 1 , 2, 3, 4, 5, 6, 7, and 8 drug moieties are coyalently attached to the antibody.
  • the average number of drugs per antibody in preparations of ADC from conjugation reactions may be characterized by conventional means such as mass spectroscopy, ELISA assay, electrophoresis, and HPLC.
  • the quantitative distribution of ADC in terms of p may also be determined.
  • ELISA the averaged value of p in a particular preparation of ADC may be determined (Hamblett et al (2004) Clin. Cancer Res, 10:7083-7070; Sanderson et ai (2005) C!in. Cancer Res. 11 :843- 852).
  • the distribution of (drug) values is noi discernible by the antibody-antigen binding and detection limitation of ELISA.
  • ELISA assay for detection of antibody-drug conjugates does not determine where the drug moieties are attached to the antibody, such as tiie heavy chain or light chain fragments, or the particular amino acid residues.
  • separation, purification, and characterization of homogeneous ADC where p is a certain value from ADC with other drug loadings may be achieved by means such as reverse phase HPLC or electrophoresis.
  • p may be limited by the number of attachment sites on the antibody.
  • an antibody may have only one or several cysteine thiol groups, or may have oniy one or several sufficiently reactive thiol groups through which a iinker may be attached.
  • Higher drug loading, e.g. p >5, may cause aggregation, insolubility, toxicity, or loss of cellular permeability of certain antibody-drug conjugates.
  • an antibody may contain, for example, many lysine residues that do not react with the drug-linker intermediate (D-L) or iinker reagent. Only the most reactive lysine groups may react with an amine-reactive linker reagent. Also, only the most reactive cysteine thiol groups may react with a thio!-reactive iinker reagent. Generally, antibodies do not contain many, if any, free and reactive cysteine thiol groups which may be linked to a drug moiety.
  • cysteine thiol residues in the antibodies of the compounds exist as disulfide bridges and must be reduced with a reducing agent such as dithiothreitol (DT I) or TCEP, under partial or total reducing conditions.
  • a reducing agent such as dithiothreitol (DT I) or TCEP
  • the loading (drug/antibody ratio) of an ADC may be controlled in several different manners, including: (i) limiting the molar excess of drug-linker intermediate (D-L) or linker reagent relative to antibody, (ii) limiting the conjugation reaction time or temperature, and (iii) partial or limiting reductive conditions for cysteine thiol modification.
  • Cysteine amino acids may be engineered at reactive sites in an antibody and which do not form intrachain or intermolecular disulfide linkages (Junutuia, et al., 2008b Nature Biotech 26 ⁇ 8);925-932; Dornan et al (2009) Blood 114( 13 ⁇ :2721-27:29; US 7521541 ; US 7723485; O2009/052249, Shen et al (2012) Nature Biotech., 30(2 ⁇ :184-191 ; Junutuia et al (2008) Jour of immun. Methods 332.41-52).
  • the engineered cysteine thiols may react with linker reagents or the drug-linker reagents of the present invention which have thiol-reactive, e!eetrophif!G groups sucn as maleimide or alpha-halo amides to form ADC with cysteine engineered antibodies (ThioMabs) and the PBD drug moieties.
  • the location of the drug moiety can thus be designed, controlled, and known.
  • the drug loading can be controlled since the engineered cysteine thiol groups typically react with thiol-reactive linker reagents or drug-linker reagents in high yield.
  • a drug loading near 2 can be achieved and near homogeneity of the conjugation product ADC.
  • the resulting product is a mixture of ADC compounds with a distribution of drug moieties attached to an antibody, e.g. 1 , 2, 3, etc.
  • Liquid chromatography methods such as polymeric reverse phase (PLRP) and hydrophobic interaction (HIC) may separate compounds in the mixture by drug loading value.
  • Preparations of ADC with a single drug loading value (p) may be isolated, however, these single loading value ADCs may still be heterogeneous mixtures because the drug moieties may be attached, via the linker, at different sites on the antibody.
  • antibody-drug conjugate compositions of the invention include mixtures of antibody-drug conjugate compounds where the antibody has one or more PBD drug moieties and where the drug moieties may be attached to the antibody at various amino acid residues.
  • the average number of dimer pyrrolobenzodiazepine groups per cell binding agent is in the range 1 to 20. In some embodiments the range is selected from 1 to 8, 2 to 8, 2 to 6, 2 to 4, and 4 to 8.
  • the eel! binding agent is a linear or cyclic peptide comprising 4-20, preferably 6-20, contiguous amino add residues.
  • one cell binding agent is linked to one monomer or dimer pyrroiobenzodiazeptne compound.
  • the cell binding agent comprises a peptide that binds integrin a v p s .
  • the peptide may be selective for ⁇ ⁇ ⁇ « over XYS.
  • the eel! binding agent comprises the A20FMDV-Cys polypeptide.
  • the A2QFMDV-Cys has the sequence: NAVPNLRGDLQVLAGKVARTC, Alternatively, a variant of the A20FMDV-Cys sequence may be used wherein one, two, three, four, five, six, seven, eight, nine or ten amino acid residues is substituted with another amino acid residue.
  • the antibody is a monoclonal antibody; chimeric antibody; humanized antibody; fully human antibody; or a single chain antibody.
  • the antibody is a fragment of one of these antibodies having biological activity. Examples of such fragments include Fab, Fab', F(ab') 2 and Fv fragments.
  • each antibody may be linked to one or several dimer
  • pyrrolobenzodiazepine groups The preferred ratios of pyrrolobenzodiazepine to cell binding agent are given above.
  • the antibody may be a domain antibody (DAB).
  • the antibody is a monoclonal antibody.
  • Antibodies for use in the present invention include those antibodies described in WO 20140060600A1
  • tumour-associated antigens include, but are not limited to, those tumour-associated antigens set out in WO 2005/082023. See, for instance, pages 41-55.
  • the conjugates of the invention are designed to target tumour cells via their cell surface antigens.
  • the antigens are usually normal cell surface antigens which are either over- expressed or expressed at abnormal times. Ideally the target antigen is expressed only on proliferative cells (preferably tumour cells), however this is rarely observed in practice. As a result, target antigens are usually selected on the basis of differential expression between proliferative and healthy tissue.
  • Antibodies have been raised to target specific tumour related antigens including:
  • CD30 CD19, CD33, Glycoprotein HUB, CanAg, Her2 (£rbB2 Neu), CD56
  • TAA Tumor-associated antigens
  • tumor-associated polypeptides that are specifically expressed on the surface of one or more particular type(s) of cancer cell as compared to on one or more normal non-cancerous cell(s).
  • tumor-associated po!ypeptides are more abundantly expressed on the surface of the cancer cells as compared to on the surface of the non-cancerous ceils.
  • the identification of such tumor-associated cell surface antigen poiypeptides has given rise to the ability to specifically target cancer cells for destruction via antibody-based therapies.
  • TAA examples include, but are not limited to, TAA (1)-(36) listed below.
  • TAA (1)-(36) listed below.
  • information relating to these antigens ail of which are known in the art, i listed below and includes names, alternative names, Genbank accession numbers and primary reference(s), following nucleic acid and protein sequence identification conventions of the National Center for Biotechnology Information (NCBl), Nucleic acid and protein sequences corresponding to TAA (1)-(36) are available in public databases such as GenBank.
  • Tumor-associated antigens targeted by antibodies include all amino acid sequence variants and isoforms possessing at least about 70%, 80%, 85% : 90%, or 95% sequence identity relative to th sequences identified in th cited references, or which exhibit substantially the same biological properties or characteristics as a TAA having a sequence found in the cited references.
  • a TAA having a variant sequence generally is able to bind specifically to an antibody that binds specifically to the TAA with the corresponding sequence listed.
  • the sequences and disclosure in the reference specifically recited herein are expressly incorporated by reference.
  • WQ2004/032842 (Example IV); WO2003/042661 (Claim 12); WO2003/016475 (Claim 1 ); WO2002/78524 (Example 2); WO2002/99074 (Claim 19; Page 127-129); WO2002/86443 (Claim 27; Pages 222, 393); WO2003/003906 (Claim 10; Page 293); WO2002 64798 (Claim 33; Page 93-95); WO2000/14228 (Claim 5; Page 133-136); US2003 224454 (Fig 3);
  • WO2003/025138 (Claim 12; Page 150); NP_003477 soiute carrier family 7 (cationic amino acid transporter, y+system), member 5 /pid-NP_003477.3 - Homo sapiens; Gross- references: IM;600182; NP_003477.3; NMJJ15923; NM terminate 003486sky 1
  • Napi3b NAPi-3B, NPTiib, SLC34A2, solute carrier family 34 (sodium phosphate), member 2, type i! sodium-dependent phosphate transporter 3b, Genbank accession no. N J006424) J. Biol. Chem. 277 (22): 19665- 9672 (2002), Genomics 62 (2):281-284 (1999), Fei!d, J A, et a! (1999) Biochem. Biophys. Res. Commun. 258 (3):578-582);
  • WO2004/022778 (Ciaim 2); EP 1394274 (Example 1 1 ); WO2002/102235 (Claim 13; Page 326); EP0875569 (Ciaim 1 ; Page 17-19); WO2001/57188 (Claim 20; Page 329);
  • WO2004/032842 (Example IV); WO2001/751 7 (Claim 24; Page 139-140); Cross- references: MiM:604217; NP_006415.1 ; NM_006424_1
  • Sema 5b (FLJ 0372, KIAA1 45, Mm.42015, SE ASB, SE AG, Semaphorin 5b Hiog, sema domain, seven thrombospondin repeats (type 1 and type -iike), transmembrane domain (I ' M) and short cytoplasmic domain, (semaphorin) 5S, Genbank accession no, AB040878); Nagase T. , et al (2000) DNA Res.
  • ETB Endothelin type B receptor, Genbank accession no. AY27S463; Nakamuta M., et a! Biochem. Biophys. Res. Commun, 177, 34-39, 991 ; Ogawa Y., et at Biochem. Biophys. Res, Commun, 178, 248-255, 1991; Arai H. ; et al Jpn Circ. J. 56, 1303-1307, 1992; Arai H contend et ai J. Biol. Chem, 268, 3463-3470, 1993; Sakamoto A., Yanagisa a M., et ai Biochem, Biophys. Res. Commun.
  • WO2003/016494 (Fig 6); WO2003/025138 (Claim 12; Page 144); WO2001/98351 (Claim 1 ; Page 124-125); EP0522868 (Claim 8; Fig 2); WO2001/77172 (Claim 1 ; Page 297-299); US2003/109676; US6518404 (Fig 3); US5773223 (Claim 1a; Col 31-34); WO2004/001004
  • STEAP2 (HGNC_8639, iPCA-1 , PCANAP1 , STAMP1, STEAP2, STOP, prostate cancer associated gene 1 , prostate cancer associated protein 1 , six transmembrane epithelial antigen of prostate 2, six transmembrane prostate protein, Genbank accession no.
  • TrpM4 (BR22450, FLJ20041 , TRPM4, TRPM4B, transient receptor potential cation channel, subfamily M, member 4, Genbank accession no. NM_017636); Xu, X.Z., et ai Proc. Natl. Acad. Sci U.S.A. 98 (19): 10692-10697 (2001 ), Cell 109 ⁇ 3):397-407 (2002), J. Biol. Cham.
  • WO2002/3026S (Claim 27; Page 391 ); US2003/219806 (Claim 4); WO2001/62794 (Claim 14; Fig 1A-D); Cross-references; I :606936; NP_060106.2; NM_017636_1
  • CRIPTO (CR, CR1 , CRGF, CRiPTO, TDGF1. ieratocarcinoma-deriveti growth factor, Genbank accession no. NPJ3032G3 or N _003212); Ciccodicola, A., et al EMBO J, 8
  • CD21 C 2 (Complement receptor 2) or C3DR (C3d/Epstein Barr virus receptor) or Hs.73792 Genbank accession no. M260G4); Fujisaku et ai (1989) J. Biol. Cham. 264 (4):21 8-2125); Wets JJ., et ai J. Exp, Med. 167, 1047-1066, 1988; Moore M., etal Pmc. Natl. Acad. Sci. U.S.A. 84, 9194-9198, 1987; Bare! M., et at Mo!, Immunol. 35, 1025-1031 , 1998; Weis J.J., at al Proc. Nail. Acad.
  • CD79b (CD79B, CD79p, IGb (immunoglobuiirv-associated beta), B29, Genbank accession no. NMJ300626 or 11038674); Proc. Natl. Acad. $ci. U.S.A. (2003) 100 (7):4126 ⁇ 4131 Blood (2002) 100 (9);3068-3076. Muiier et a/ (1992) Eur. J. Immunol. 22 (6):1621- 1625); WO2004/016225 (ciaim 2.
  • WO2003/077836 WO2001/38490 (Claim 5; Fig 18D-1 -18D-2); WO2003/097803 (Claim 12); WO2003/089624 (Claim 25); Cross-references: MiM:606509; NP_1 10391.2; NM_030764_1
  • HER2 Erb82. Genbank accession no. M1 1730
  • Coussens L et al Science (1985) 230(4730): 1 132-1 139
  • Yamamoto T. et al Nature 319, 230-234, 986
  • Semba K et ai Proc. Natl, Acad. Set. U.S.A. 82, 6497-6501 , 1985
  • Swiercz J.M. et a! J. Cell Btoi. 165, 869- 880, 2004
  • Cho H.-S. et al Nature 421 , 756-760. 2003: Ehsani A., et at (1993) Genomics 15, 426-429; WO2004/048938 (Example 2); WO2004 027049 (Fig 11); WO2004/009622; WO2003/081210;
  • WO2003 089904 (Claim 9); WO2003/G16475 (Claim 1 ); US2003/1 18592; WO2003/008537 (Claim 1 ); WO2003/055439 (Claim 29: Fig 1A-B); WO2003/025228 (Claim 37; Fig 5C); WO20Q2/22636 (Example 3: Page 95-107); VVO2002/12341 (Claim 68; Fig 7);
  • WO2002/13847 (Page 71 -74); WO2002/14503 (Page 114-1 17); WO2001/53463 (Claim 2; Page 41 -46); WO2001/41787 (Page 15); WO2000/44899 (Claim 52; Fig 7); WO2000/20579 (Claim 3; Fig 2); US5869445 (Claim 3; Col 31-38); WO9630514 (Claim 2; Page 56-61 ); EP1439393 (Claim 7); WO2004/043361 (Claim 7); WO2004/022709; WO2001/00244 (Example 3; Fig 4); Accession: P04828; EMBL; M1 1767; AAA35808.1. EMBL; M1 1761 ; AAA35808.1
  • NCA CEACAM6, Genbank accession no, M1872S
  • Barnett T. et al Genomics 3, 59- 86, 1988
  • Tawaragi Y. et a! Biochem. Biophys. Res, Commun, 50, 89-96. 1988
  • Strausberg
  • WO2002/60317 (Claim 2); Accession: P40199; Q14920; EMBL; M29541 ; AAA59915.1. EMBL; M18728 (19) MDP (DPEP1 , Genbank accession no. BC017023); Proc. Natl. Acad. Sci. U.S.A. 99 (26):16899-16903 (2002)); WO2003/016475 (Ciaim 1); WO2002/64798 (Ciaim 33; Page 85- 87); JP05003790 (Fig 6-8); W099/46284 (Fig 9); Cross-references: M I M 79780;
  • IL20Ra (IL20Ra, ZCYTOR7, Genbank accession no. AF184971 ); Clark H.F., et al Genome Res. 13, 2285-2270, 2003; Mungaji A. J., et at Nature 425, 805-811 , 2003;
  • EP1394274 (Example 11 ); US2004/005320 (Example 5): G2QQ3/029262 (Page 74-75); WO2003/002717 (Ciaim 2; Page 63); WO2002/22 53 (Page 45-47); US20Q2/0423S6 (Page 20-21); WO2Q01/46261 (Page 57-59); WO2001/46232 (Page 63-65); W098/37193 ⁇ Claim I. ⁇ Page 55-59); Accession: Q9UHF4; Q6UWA9; Q96SH8; EMBL; AF 184971 ; AAF01320.1.
  • EpftS2R (D T, ER , Hek5, EPHT3, TyroS, Genbank accession no. NMJM4442);
  • WO20030 2661 (Claim 12); WO20G053216 ⁇ Ciaim 1 ; Page 41 ); WO200 065576 (Claim 1 ); WO2004020583 (Claim 9); WO2003004529 (Page 128- 32); O2000532 6 (Claim 1 ; Page 42); Cross-references: MIM:600997; NP_004433.2; NM_004442_1
  • PSCA Prostate stern ceil antigen precursor, Genbank accession no. AJ297436
  • Reiter R.E Reiter R.E,. et al Pmc, Natl. Acad. ScL U.S.A. 95, 1735-1740, 1998
  • Gu Z. prepares for et al Oncogene 19, 1288-1296, 2000
  • WO2001/40309 (Example 1 ; Fig 17); US2001/Q55751 (Example 1 ; Fig 1 b); VVO2000/32752 (CSaim 18; Fig 1 ); O98/51805 ⁇ Claim 17; Page 97); W098/51824 (Claim 10; Page 94); WO9S/40403 (Claim 2; fig 18); Accession: 043653; EMBL; AF043498; AAC39607.1 (25) GEDA ⁇ Genbank accession No. AY260763); AAP14954 lipoma HIV1GIC fusion-partner- iike protein /pid-AAP14954.1 - Homo sapiens (human); WO2003/054152 (Claim 20);
  • WO2003/000842 (CSaim 1 ); WO2003/023013 (Example 3, Claim 20); US2003/194704 (Ciaim 45); Cross-references; G!;30102449; AAP14954.1 ; AY260763_1 (26) BAFF-R (S cell -activating factor receptor, BL ' yS receptor 3, BR3, Genbank accession
  • BAFF receptor /pid NP_443177.1 - Homo sapiens: Thompson, J.S., et a!
  • CD22 (B-ce!l receptor CD22-B iSOform, BL-CAM, Lyb-8, Lyb8, SIGLEC-2, FLJ22814,
  • WO2003/072036 (Claim 1 ; Fig 1); Cross-references: MiM; 107266; NPJ)Q1762.1 ;
  • CD79a (CD79A, CD79a, immunoglobulin-associated alpha, a B cell-specific protein that covalently interacts with Ig beta (CD79B) and forms a comple on the surface with !g M molecules, transduces a signal involved in B-ceil differentiation), pi; 4.84, MW: 25028 TM: 2 [P] Gene Chromosome: 1Sq13.2, Genbank accession No, NPJ301774.1O); WO2003/088808, US2003/0228319; WO2003/062401 (claim 9); US2002/150573 (claim 4, pages 13-14); W099/58658 (claim 13, Fig 16); WO92/07574 (Fig 1); US5644033; Ha et a!
  • CXCR5 Burkitfs lymphoma receptor 1 , a G protein-coupled receptor that is activated by the CXCL13 chemokine, functions in lymphocyte migration and humoral defense, plays a role in HIV-2 infection and perhaps development of AiDS, lymphoma, myeloma, and leukemia); 372 aa, pi: 8.54 MW: 41S59 TM; 7 [P] Gene Chromosome: 1 q23.3, Genbank accession No. NP_001707.1); WO2004/0400C0; WO2004 0 5426; US2003/105292
  • Example 2 US6555339 (Example 2); WO20G2/61087 (Fig 1); WO2001/57188 (Claim 20, page 269); WO2001/72830 (pages 12-13); W02GGG/22129 (Example 1 , pages 152-153, Example 2, pages 254-256); W099/28468 (claim 1 , page 38); US5440021 (Example 2, col 49-52); W094/28931 (pages 56-58); W092/17497 (claim 7, Fig 5); Dobner ef al (1992) Eur. 1 Immunol. 22:2795-2799: Barela ef a/ (1995) Biochem. J. 309:773-779
  • HLA-DOB Beta subunit of HC class II molecule (!a antigen) that binds peptides and presents them to CD4+ T lymphocytes); 273 aa, pi: 6.56, MW: 30820.TM: 1 ;Pj Gene
  • Chromosome 6p21.3, Genbank accession No. NP J302111.1 ); Tonne!ie et al (1985) EMBO J, 4(1 ):2839-2847; Jonsson et a/ (1989) Immunogenetics 2 ( ⁇ 4 ⁇ 1-413; Beck et al (1992) J. Mot. Biol. 228:433-4 1; Stfausberg ef a/ (2002) Proc. Natl, Acad. Set USA 99:16898- 16903; Servensus et a (1987) J. Biol. Chem. 262:8759-8766; Beck ef al (1996) J.
  • P2X5 Purinergic receptor P2X iigand-gated ion channel 5, an ion channel gated by extracellular ATP, may be involved in synaptic transmission and neurogenesis, deficiency may contribute to the pathophysiology of idiopathic detrusor instability
  • 422 aa pi: 7,63, MW: 47206 TfVS: 1
  • Gene Chromosome 17p13,3, Genbank accession No.
  • WO2003/072035 (claim 10); Touchmsn ei ai (2000) Genome Res. 10:165-173; WO2002/22660 (claim 20); WO2003/093444 (claim 1 ); WO2003/087768 (claim 1 );
  • CD72 B-cell differentiation antigen CD72, Lyb-2
  • Gene Chromosome 9p13.3, Genbank accession No. PJ3G1773.1
  • LY64 Lymphocyte antigen 64 (RP105), type I membrane protein of the leucine rich repeat (LRR) family, regu!ates B-cei! aciivatson and apoptosss, loss of function is associated with Increased disease activity in patients with systemic lupus erythematous); 661 aa 5 pi; 6.20, MW: 74147 TM; 1 [P] Gene Chromosome: 5q12, Genbank accession No.
  • NP_005573.1 US2GQ2/193567; WO97/0719S (claim 11 , pages 39-42); Miura ef a/ (1996) Genomics 38(3):299-304; Miura et al (1998) Blood 92:2815-2822; VVO2003/083047;
  • FcRHI Fc receptor-like protein 1 , a putative receptor for the immunoglobulin Fc domain that contains C2 type Ig-fike and !TAM domains, may have a role in B-!ymphocyte differentiation
  • 429 aa. pi 5.28, MW: 46925 TM: 1
  • Gene Chromosome 1q21-1q22, Genbank accession No. NP_443170.1
  • WO2003/077836 WO2001/38490 (claim 6, Fig 18E-1-18-E-2); Davis ef a/ (2001) Proc Natl, Acad. Sci USA 98(17):9772-9777;
  • IRTA2 Immunoglobulin superfamily receptor translocation associated 2, a putative imrnunoreceptor with possible roies in B ceil development and lympftomagenesis
  • TENB2 (TMEFF2, tomoreguBn, TPEF, HPP1, T , putative transmembrane
  • proteoglycan related to the EGF/heregulin family of growth factors and fo!listatin ; 374 aa, NCB! Accession: AAD55776, AAF91397, AAG49451 , NCSi RefSeq: NPJ357276; NCBi Gene: 23671 ; QM ⁇ M: 605734; SwissProt Q9UIK5; Genbank accession No. AF179274; AY358907, CAF85723, CQ782436; WO2004 074320; JP2004113151 ; WO2003/042661 ;
  • the parent antibody may also be a fusion protein comprising an albumin-binding peptide (ABP) sequence (Dennis ef at. (2002) “Albumin Binding As A General Strategy For improving The Pharmacokinetics Of Proteins” J Bio! Chem, 277:35035-35043; WO
  • ABSP albumin-binding peptide
  • Antibodies of the invention include fusion proteins with ABP sequences taught by: (!) Dennis et a ⁇ 2002) J Biol Chem, 277:35035-35043 at Tables III and IV, pag 35038; (is) US 2004/0001827 at [0076]; and (iii) WO 01/45746 at pages 12-13, and aii of which are incorporated herein by reference.
  • the antibody has been raised to target specific the tumour related antigen ⁇ ⁇ ⁇ 6 .
  • the cell binding agent ma be labelled, for example to aid detection or purification of the agent either prior to incorporation as a conjugate, or as part of the conjugate.
  • the label may be a biotin label.
  • the cell binding agent may be labelled with a radioisotope. R and R'
  • R is independently selected from optionally substituted € ⁇ alkyf
  • R is independently optionally substituted Ci -12 alkyl.
  • R is independently optionally substituted C 3 . 2 o heterocyclyl.
  • R is independently optionally substituted C 5 _ 20 aryi.
  • R is independently optionally substituted C M2 alkyl. Described above in relation to R 2 are various embodiments relating to preferred alkyl and aryi groups and the identity and number of optional substituents. The preferences set out for R 2 as it applies to R are applicable, where appropriate, to all other groups R, for examples where R 6 , R 7 , R 8 or R 9 is R.
  • a compound having a substituent group -NRR' in one embodiment, .
  • the ring may contain a further heteroatom, for example N, O or S.
  • the heterocyclic ring is itself substituted with a group R. Where a further N heteroatom is present, the substituent may be on the N heteroatom.
  • R" is a C g . -ta aikylene group, which chain may be interrupted by one or more heteroatoms, e.g. O, S, N(H), HMe and/or aromatic rings, e.g. benzene or pyridine, which rings are optionally substituted.
  • heteroatoms e.g. O, S, N(H), HMe and/or aromatic rings, e.g. benzene or pyridine, which rings are optionally substituted.
  • R" is a C;-. - ; a!kyiene group, which chain may be interrupted by one or more heteroatoms and/or aromatic rings, e.g. benzene or pyridine.
  • the aikylene group is optionally interrupted by one or more heteroatoms seiected from O, S, and NMe and/or aromatic rings, which rings are optionally substituted.
  • the aromatic ring is a C3 ⁇ 4.3 ⁇ 4) arylene group, where arylene pertains to a divalent moiety obtained by removing two hydrogen atoms from two aromatic ring atoms of an aromatic compound, which moiety has from 5 to 20 ring atoms.
  • R" is a C 3 . i2 aikylene group, which chain may be interrupted by one or more heteroatoms, e.g. O, S, N(H), NMe and/or aromatic rings, e.g. benzene or pyridine, which rings are optionally substituted by NH 2 .
  • R" is a C 3 ⁇ 4 .1 ⁇ 2 aikylene group.
  • R" is selected from a C 3 , C 5 , C 7 , C 9 and a Cn aikylene
  • R" is selected from a C 3 , C 5 and a C 7 aikylene group
  • R" is selected from a C 3 and a C 5 aikylene group
  • R* is a C s aikylene group
  • R" is a C 5 aiky!ene group.
  • the aikylene groups listed above may be optionally interrupted by one or more heteroatoms and/or aromatic rings, e.g. benzene or pyridine, which rings are optionally substituted.
  • the alkylene groups listed above may be optionally interrupted by one or more heteroatoms and/or aromatic rings, e.g. benzene or pyridine.
  • alkylene groups listed above may be unsubstituted linear aliphatic alkylene groups.
  • X is selected from O, S, or N(H).
  • X is O.
  • the compounds where one or both C rings is replaced by a ring of formula E have a group R s which with either of or R : ⁇ together with carbon atoms of the C ring to which they are attached, form an optionally substituted benzene ring.
  • the optionally substituted benzene ring may be regarded as fused to the C ring of the pyrrolobenzodiazepine.
  • the fused benzene ring may be referred to as the D ring.
  • the structure of the fused ring is illustrated below:
  • each of D ', D 2 , D 3 and D 4 represents H or a substituent.
  • the benzene ring is unsubstituted.
  • the benzene ring is optionally substituted with one, two, three of four groups selected from OH, CN, R, OR 5 0 ⁇ SQ 2 -R, C0 2 R, COR, SH, SR, NH 2 , NHR, NRR', NOs, e 3 Sn and ha!o.
  • the benzene ring is monosubstituted.
  • the monosubstituent may be any one of D ⁇ D 2 , D 3 or D '3 ⁇ 4 (the rest being H).
  • the benzene ring is substituted at D 2 , and D ! , D 3 ⁇ 4 and D 4 are eac H.
  • the benzene ring is substituted at D 3 , and D ⁇ D 2 and D are each .
  • R 2 with R 1 together with carbon atoms of the C ring to which they are attached, form an optionally substituted benzene ring.
  • U is CH ; , when T is NR. BH, SO, or S0 2 .
  • T is CH 2 or CO when U is NR, O or S.
  • T is selected from CH 2 and CO.
  • U is selected from NR, O and S.
  • Y is (CH 2 )n, where n is 1 or 2.
  • the C ring of the compound A-B has a structure selected from those shown below:
  • V and W are each selected from (CH ? ) fi> O, S, NR. CHR, and CRR' where n is 2,3 or 4, except that V is C when R 1 and R 2 , together with carbon atoms of the C ring to which they are attached, form an optionally substituted benzene ring, and W is C when R 3 and R 2 , together with carbon atoms of the C ring to which they are attached, form an optionally substituted benzene ring.
  • the other of V and W is selected from CH 2 and NR.
  • V and W when one of V and W is C, the other of V and W is CH 2 .
  • CBA is a ce!i binding agent such as an antibody or a cyclic or linear peptide
  • n is 0 or 1
  • Y, R and R are as previously defined, and R E and R E " are each
  • n 0;
  • n 1 ;
  • R E is H; R E is R D , where R D is optionally substituted alkyl;
  • R E is R D , where R D is methyl
  • CBA is an antibody
  • CBA is a cyclic peptide
  • R L1 and R L2 are H;
  • R L1 and R L2 are Me.
  • CBA ss a ce!i binding agent such as an antibody or a cyclic or linear peptide, Y, and R L2 are as previously defined
  • Ar 1 and Ar 2 are each independently optionally substituted C « ; 3 ⁇ 4 aryl, and n is 0 or 1
  • Ar 1 and Ar 2 may be the same or different.
  • Ar 1 and Ar a in each of the embodiments above are each independently selected from optionally substituted phenyl, furanyl, thiophenyi and pyridyl.
  • Ar 1 and Ar 2 in each of the embodiments above is optionally substituted phenyl.
  • Ar 1 and Ar 2 in each of the embodiments above is optionally substituted thien-2-yl or thien-3-yl.
  • Ar 1 and Ar 2 in each of the embodiments above is optionally substituted quinolinyl or isoquinolinyl.
  • the quinolinyl or isoquinolinyl group may be bound to the PBD core through any available ring position.
  • the quinoiinyi may be quinolin-2-yl, quinolin-3-yl, quinolin-4yl, quinoSin-5-yi, quinolin-6-yi, qutnolin-7-yl and quinolin-8-yl. Of these quinolin-3-yl and quinoHn-6-yl may be preferred.
  • the isoquinolinyl may be isoquinolin-1 -yl, isoquinolin-3-yl, isoquinolin-4yl, isoquinolin-5-yl, isoquinolin-6-yl, isoquinolin-7-yl and isoquinolin-8-yl. Of these isoquinolin-3-yl and isoquinolin-6-yl may be preferred.
  • CBA is a cell binding agent such as an antibody or a cyclic or linear peptide
  • R V1 and R vz are indepdentiy selected from H, methyl, ethyi and phenyl ⁇ which phenyl may be optionally substituted with fiuoro, particularly in the 4 position) and C &i ⁇ heterocyciyi, and n is 0 or 1.
  • R V1 and R s may be the same or different.
  • R V and R V2 may be indepdentiy selected from H, phenyl and 4 ⁇ fiuorophenyi.
  • the present invention also provides intermediates for use in the preparation of the conjugate compounds described herein. Preferred intermediates are described below, and correspond closely to the preferred conjugates described above.
  • n 0 or 1
  • Y, R and are as previously defined, and R and R are each independenily seiected from H or R°
  • Y, R and R L2 are as previously defined Ar and Ar are each independently optionally substituted C s . 20 aryi, and n is 0 or 1 , Ar 1 and Ar 2 may be the same or different.
  • R v1 and R V2 are fndepdently selected from H, methyl, ethyl and phenyl (which phenyl may be optional!y substituted with fluoro, particularly in the 4 position) and C 5 _ 6 heterocyclyl, and n is 0 or 1.
  • R V and R V2 may be the same or different.
  • substituted refers to a parent group which bears one or more substituents.
  • substituted is used herein in the conventional sense and refers to a chemical moiety which is covalently attached to, or if appropriate, fused to, a parent group.
  • substituents are well known, and methods for their formation and introduction into a variety of parent groups are also well known.
  • the substituents described herein are limited to those groups that are not reactive to a cell binding agent.
  • the link to the cell binding agent in the present case is formed from the N10 position of the PBD compound through a linker group (comprising, for example, L , L 2 and A) to the cell binding agent.
  • Reactive functional groups located at other parts of the PBD structure may be capable of forming additional bonds to the cell binding agent (this may be referred to as crosslinking). These additional bonds may alter transport and biological activity of the conjugate. Therefore, in some embodiment, the additional substituents are limited to those lacking reactive functionality.
  • the substituents are selected from the group consisting of R, OR, SR, NRR', N0 3 , halo, C0 2 R, COR, CONHa, CONHR, and CONRR'.
  • the substituents are selected from the group consisting of R, OR, SR, NRR ⁇ N0 2 , C0 2 R, COR, CONH 2 , CONHR, and CONRR'.
  • the substituents are selected from the group consisting of R, OR, SR, NRR', N0 2 , and halo.
  • the substituents are selected from the group consisting of R, OR, SR, NRR', and N0 2 .
  • any one of the embodiment mentioned above may be applied to any one of the substituents described herein.
  • the substituents may be selected from one or more of the groups listed fae!ow.
  • CMJ alk l The term "CMS aikyf" as used herein, pertains to a monovalent moiety obtained by removing a hydrogen atom from a carbon atom of a hydrocarbon compound having from 1 to 12 carbon atoms, which may be aliphatic or aiicyciie, and which may be saturated or unsaturated (e.g. partially unsaturated, fully unsaturated).
  • alkyi includes the sub-classes alkenyl, alkynyl, cycloalkyl, etc., discussed below.
  • saturated alkyl groups include, but are not limited to, methyl (d), ethyl (C 2 ), propyl (C 3 ), butyl (C, ; ) ? pentyi (C; ). hexyl (C 6 ) and heptyl (C 7 ).
  • saturated linear alkyl groups include, but are not limited to, methyl (C-,), ethyl (C;.), n-propy! (C ;i ⁇ , n-buty! (C ), n-penty! (amy! (C 5 ), n-hexyl (C 6 ) and n-heptyl (C 7 ).
  • saturated branched aikyi groups include iso-propyl (C 3 ), iso-butyl (C 4 ), sec-butyl (C 4 ), tert-butyl (C 4 ), iso-pentyl (C 5 ), and neo-pentyl (C 5 ).
  • alkyi group may optionally be interrupted by one or more heteroatoms selected from O, ⁇ H) and S. Such groups may be referred to as "heteroalkyl".
  • C2-20 Heteroalkyl The term "C2-12 heteroalkyl" as used herein, pertains to a monovalent moiety obtained by removing a hydrogen atom from a carbon atom of a hydrocarbon compound having from 2 to 12 carbon atoms, and one or more heteroatoms selected from
  • heteroalkyl groups include, but are not limited to those comprising one or more ethylene glycol units of the type -(OCH 2 CH 2 )-.
  • the terminal of a heteroalkyl group may be the primary form of a heteroatom, e.g. -OH, -SH or -NH 2 . In a preferred embodiment, the terminal is -CH 3 .
  • C 2 -i2 alkynyl The term "C 2 . 12 alkynyf as used herein, pertains to an alkyl group having one or more carbon-carbon triple bonds.
  • unsaturated alkynyl groups include, but are not limited to, ethynyl (-C ⁇ CH) and 2-propynyl (propargyl, -CH 2 -C ⁇ CH).
  • C3-12 cycloalkyl The term "C 3 . 12 cycloalkyl" as used herein, pertains to an alkyl group which is also a cyciyl group; tha is, a monovalent moiety obtained by removing a hydrogen atom from an alicyclic ring atom of a cyclic hydrocarbon (carbocyclic) compound, which moiety has from 3 to 7 carbon atoms, including from 3 to 7 ring atoms.
  • Examples of cycloaikyi groups include, but are not limited to, those derived from:
  • C 3 _2o heterocyclyl refers to a monovalent moiety obtained by removing a hydrogen atom from a ring atom of a heterocyclic compound, which moiety has from 3 to 20 ring atoms, of which from 1 to 10 are ring heteroatoms.
  • each ring has from 3 to 7 ring atoms, of which from 1 to 4 are ring heteroatoms.
  • the prefixes e.g. C3-20, C 3 - 7 , C 5 -6, etc.
  • the prefixes denote the number of ring atoms, or range of number of ring atoms, whether carbon atoms or heteroatoms.
  • the term "C ⁇ heterocyciyi", as used herein, pertains to a heterocyclyl group having 5 or 6 ring atoms.
  • monocyclic heterocyciy! groups include, but are not limited to, those derived from:
  • O-i oxirane (C 3 ), oxetane (C 4 ), oxolane (tetrahydrofuran) (C 5 ), oxole (dihydrofuran) (C 5 ), oxane (tetrahyd ropy ran) (C 6 ), dihydropyran (C 6 ), pyran (C 6 ), oxepin (C 7 );
  • dioxolane C- : ). dioxane (C 6 ), and dsoxepane (C 7 );
  • O-IS-I oxathiole (C 5 ) and oxathiane (thioxane) (C 6 ); and,
  • substituted monocyclic heterocyciyi groups include those derived from saccharides, in cyclic form, for example, furanoses (C 5 ), such as arabinofuranose, lyxofuranose, ribofuranose, and xylofuranse, and pyranoses (Ce), such as aSlopyranose, altropyranose, glucopyranose, mannopyranose, gulopyranose, idopyranose,
  • Cs-so ary! Cs-so ary!;
  • C5.20 aryT as used herein, pertains to a monovalent moiety obtained by removing a hydrogen atom from an aromatic ring atom of an aromatic compound, which moiety has from 3 to 20 ring atoms. Preferably, each ring has from 5 to 7 ring atoms.
  • the prefixes e.g. C3-20, C5- 7 , C5- 6 , etc.
  • the prefixes denote the number of ring atoms, or range of number of ring atoms, whether carbon atoms or heteroatoms.
  • the term "C ⁇ aryi" as used herein, pertains to an aryi group having 5 or 6 ring atoms.
  • the ring atoms may be all carbon atoms, as in "carboaryl groups”.
  • carboaryi groups include, but are not !!mited to, those derived from benzene (i.e. phenyl) (Cg), naphthalene (do ⁇ > azulene (do), anthracene (C M ) « phenanthrene (On), naphthacene (C 1S ), and pyrene (de)-
  • aryi groups which comprise fused rings, at least one of which is an aromatic ring include, but are not limited to, groups derived from indane (e.g.
  • the ring atoms may include one or more heteroatoms, as in "heteroaryl groups".
  • heteroaryl groups include, but are not limited to, those derived from;
  • iOi oxazole (C 5 ), isoxazole (C 5 ), isoxazine (Cs);
  • N a imidazole (1 ,3-diazQle) (C s ), pyrazo!e (1 ,2-diazole) (C 5 ), pyridazine (1 ,2-diazine) (C 6 ), pyrimidine (1 ,3-diazine) (C s ) (e.g., cytosine, thymine, uracil), pyrazine (1 ,4-diazine) (C 6 ); N 3 ; triazole (C g ⁇ ⁇ tria2ine (Cs); and,
  • heteroaryS which comprise fused rings, include, but are not limited to:
  • C 9 (with 2 fused rings) derived from benzofuran (O-,), isobenzofuran (O ⁇ , indole (N-i), isoindole (N-i), indolizine (N-i), indoline ( ⁇ ), isoindoline (N-i), purine (N ) (e.g., adenine, guanine), benzimidazole (N 2 ), indazole (N 2 ), benzoxazole
  • benzodioxole (0 2 ), benzofurazan (N 2 0 1 ), benzotriazole (N 3 ), benzothiofuran (Si), benzothiazole (N 1 S 1 ), benzothiadiazole (N 2 S);
  • CM with 3 fused rings derived from acridsrte (Ni), xanthene (CM), thioxanthene (Si), oxanthrene ⁇ C1 ⁇ 2 ⁇ , phenoxathiin ⁇ OSi ' phenazine (N 2 ), phenoxazine ( ⁇ - ⁇ - ⁇ ), phenothiazine ( 1 S- 1 ), thianthrene (S 2 ), phenanthridine ( ⁇ , phenanthroline (N 2 ), phenazine (N 2 ).
  • Aikoxy -OR, wherein R is an alkyl group, for example, a C-i_ 7 alkyl group.
  • C 1-7 aikoxy groups include, but are not limited to, -OMe (methoxy), -OEt (ethoxy), -O(nPr) (n- prapoxy), -O(iPf) (isopropoxy), -O(nSu) (h-butoxy), -O(sBu) (sec-butoxy), -O(iBu)
  • R 1 is a hemiacetal substituent, for example, a C lkyl group, a C 3 . aa heterocyciyi group, or a C C aryi group, preferably a C h alk ! group.
  • hemiacetal groups include, but are not limited to, -CH(OH) ⁇ OMe) and - CH(OH)(OEt).
  • Ketal -CR(OR s )(OR 2 ), where R 1 and R 2 are as defined for acetals, and R is a ketal substituent other than hydrogen, for example, a C 1-7 alkyl group, a ⁇ 3 _ 20 heterocyciyi group, or a Cs-jo ar i group, preferably a C h alk ! group. Examples keta!
  • hemiacetal groups include, but are not limited to, -C(Me)(OH)(OMe), -C(Et)(OH)(OMe), -C(Me)(OH)(OEt), and
  • Imino (imine): -NR, v/herein R is an imino substituent, for example, hydrogen, Ci.? alkyi group, a heterocyciyi group, or a ⁇ -1 ⁇ 2.3 ⁇ 4> aryl group, preferably hydrogen or a d. 7 alkyi group.
  • Formyl (carbaldehyde, carboxaldehyde): -C( 0 ⁇ H, Acyi (keto): -G( ⁇ 0)R, wherein R is an acyi substituent, for example, a d. / aik l group (also referred to as Ci ⁇ alkyiacyl or C 17 aikartoyi).. a ⁇ 3 .2 ⁇ heterocyciyi group (also referred to as C:3 ⁇ 4. 20 heierocyc!ylacy!), or a C ⁇ so a yl group ⁇ also referred to as Cs-soarylacyl), preferably a Ch alky! group.
  • R is an acyi substituent, for example, a d. / aik l group (also referred to as Ci ⁇ alkyiacyl or C 17 aikartoyi).. a ⁇ 3 .2 ⁇ heterocyciyi group (also referred
  • Carboxy (carboxylic acid): -C( 0)OH.
  • Thiocarboxy (thiocarboxylic acid): -C( S)SH.
  • Thiolocarboxy ⁇ thiolocarboxylic acid): -C( 0)SH.
  • Thionocarboxy (thionocarboxylic acid): -C( S)OH.
  • imidic acid: -C( NH)OH.
  • acyloxy (reverse ester): -QC( 0)R, wherein R is an acyloxy substituent, for example, a C ? aikyl group, a Ca ⁇ o eterocyciyi group, or a Canary! group, preferabiy a C h alky! group.
  • R is an acyloxy substituent, for example, a C ? aikyl group, a Ca ⁇ o eterocyciyi group, or a Canary! group, preferabiy a C h alky! group.
  • R is an ester substituent, for example, a Ci ? aiky! group, a G 3 .3 ⁇ 4j heterocyciyl group, or a C ' s-joaryl group, preferably a d. ? alkyi group.
  • R 1 and R are independently amino substttuents, for example, hydrogen, a C ; aikyi group (also referred to as Ci-? alkyiamino or dj-C ralkylamino), a C ⁇ Z o heterocyciyl group, or a C ⁇ o i group, preferably H or a d. ?
  • Amino groups may be primary (-NH 2 ), secondary (-NHR 1 ), or tertiary (-NHR ' ⁇ R 2 ). and in cationic form, may be quaternary (-*NR R 2 R 3 ).
  • amino groups inciude are not limited to, -NH 2 , -NHCH 3 , -NHC(CH 3 ) 2 , -N(CH 3 ) 2 , - (CH 2 CH 3 ) 2 , and -NHPh.
  • Exampies of cyclic amino groups include, but are not limited to, aziridino, azetidino, pyrrolidino, piperidino, piperazino, morpholino, and thiomorpholino.
  • Amido (carbamoyl, carbamyl, aminocarbonyl, carboxamide): -C ⁇ 0)NR 1 R 2 , wherein R 1 and R 2 are independently amino substituents, as defined for amino groups.
  • R a is an acyl substituent, for example, a C ⁇ alkyl group, a C3.20 heterocyclyi group, or a C ⁇ ary! group, preferably hydrogen or a Ch alky! group.
  • R 1 and R 2 may togeiher form a cyciic structLfre, as in, for example, succinimidyl, maleimidyl, and phthalimidyl: succinimidyl maleimidyl phthalimidyl
  • R 2 and R 3 are independently amino substituents, as defined for amino groups, and R 1 is a ureido substituent, for example, hydrogen, a C h alk ! group, a C 3 . 3 a heterocyciyi group, or a Cg ⁇ aryl group, preferably hydrogen or a Ch alky! group.
  • ureido groups include, but are not limited to, -NHCONH 2 , -NHCONHMe, -NHCONHEt, -NHCONMe 2 , -NHCONEt 2 , -NMeCONH 2 , -NMeCONHMe, -NMeCONHEt, - NMeCONMe 2 , and -NMeCONEt 2 .
  • Tetrazolyl a five membered aromatic ring ur nitrogen atoms and one carbon atom
  • Imino: NR, wherein R is an imino substituent, for example, for example, hydrogen, a Ci_ 7 alkyl group, a C 3 . 2 o heterocyciyi group, or a C 3 ⁇ 4 . 20 aryl group, preferably H or a C ⁇ / alkyl group.
  • Amidine (amidine): -C ⁇ NR)NR 2! wherein each R is an amidine substituent, for example, hydrogen, a C 1 .7 alkyl group, a C ⁇ so heterocyciyi group, or a C 5 - 2 o aryl group, preferably H or a C ⁇ alkyl group.
  • Nitroso -NO. Azido: -N 3 . Cyano (nitrile, carbonitrile): -CN. isocyano: -NC. Cyanato: -OCN.
  • Isocyanato -NCO.
  • R is a thioether substituent, for example, a C -7 alkyl group (also referred to as a Ct.raikylthio group ⁇ , a (3 ⁇ 4. 20 heterocyclyl group, or a C 5 . 20 aryl group, preferably a C t .? aiiky1 group.
  • Examples of C v? alkylthio groups include, but are not limited to,
  • Disulfide -SS-R, wherein R is a disulfide substituent, for example, a C h alky! group, a 0 ⁇ , ⁇ heterocyciyi group, or a C s ,3 ⁇ 4 ary! group, preferably a C1.7 aikyi group (also referred to herein as C ; aikyi disuiiide).
  • Exampies of C 1-7 aikyi disulfide groups include, but are not iimited to, -SSCH 3 and -SSCH 2 CH 3 .
  • Su!fine (suifinyi sulfoxide): -S ⁇ 0)R, wherein R is a su!fine substituent, for example, a Ci, 7 aikyi group, a C ⁇ e heterocyciyi group, or a Cs-sosr i group, preferably a C,.? aikyi group.
  • R is a su!fine substituent, for example, a Ci, 7 aikyi group, a C ⁇ e heterocyciyi group, or a Cs-sosr i group, preferably a C,.? aikyi group.
  • Sulfinate sulfinic acid ester
  • R is a sulfonate substituent, for exampie, a Ci j aikyi group, a 0 3 . 2 ⁇ heierocyciyi group, or a Cs.a>aryf group, preferably a Ct..? alkyl group.
  • R is a sulfinyloxy substituent, for example, a Ci_ 7 alkyl group, a C 3 . i0 heierocyciyi group, or a C s . so aryl group, preferably a Ch alky! group.
  • su!fsnyioxy groups include, but are not limited to, ⁇ OS(-0)CH 3 and -OS ⁇ OJCHaCHa.
  • R is a suifonyioxy substituent, for exampie, a d ⁇ alkyi group, a C 3 ⁇ 4 heterocyciyi group, or a C& ⁇ aryl group, preferably a C 3 ⁇ 4 .? alkyl group.
  • R 1 and R 2 are independently amino substituents, as defined for amino groups.
  • R and R 2 are independently amino substituents, as defined for amino groups.
  • R 1 is an amino substituent, as defined for amino groups.
  • R 1 is an amino substituent, as defined for amino groups
  • R is a sulfonamino substituent, for example, a C r alkyl group, a C3.20 heterocyclyl group, or a C 5 _ 20 aryl group, preferably a C h alky! group.
  • sulfinamino groups include, but are not limited to, -NHS( «0)CH 3 and
  • Examples of phosphino groups include, but are not limited to, -PH 2 , -P(CH 3 ) 2 , -P(CH 2 CH 3 ) 2 , -P(t-Bu) 2 , and -P(Ph) 2 .
  • R is a phosphinyl substituent, for example, a Cv7 alk l group, a C - heterocyclyl group, or a C ⁇ ...3 ⁇ 4 aryi group, preferably a Cw alkyl group or a C5.20 ar i group.
  • R is a phosphonate substituent, for example, -H, a Ci. 7 afkyl group, a C ⁇ heterocyclyl group, or a C 5 _ 20 aryl group, preferably -H, a Ci.ralky! group, or a Cg ⁇ aryJ group.
  • R is a phosphate substituent, for example, -H, a C r . 7 aikyl group, a C 3 , 20 heterocyclyl group, or a C ⁇ ar ! group, preferably -H, a Ch alky!
  • Phosphorous acid -OP(OH) 2 .
  • Phosphite -OP(OR) 2 , where R is a phosphite substituent, for example, -H, a C ⁇ alkyl group, a C 3 . 20 heterocyclyl group, or a C ⁇ aryl group, preferably -H, a C : a!kyl group, or a C3 ⁇ 43 ⁇ 4 > aryl group.
  • R is a phosphite substituent, for example, -H, a C ⁇ alkyl group, a C 3 . 20 heterocyclyl group, or a C ⁇ aryl group, preferably -H, a C : a!kyl group, or a C3 ⁇ 43 ⁇ 4 > aryl group.
  • Examples of phosphite groups include, but are not limited to, - ⁇ ( ⁇ 3 ) ⁇ :
  • Phosphoramidite -OP(OR '? )-NR ? 2l
  • R 1 and R 2 are prtosphoramidite substituents, for example, -H, a (optionally substituted) Ot.? alkyl group, a C g . 2 e heterocycty! group, or a ⁇ 3 ⁇ 4..3 ⁇ 4! aryl group, preferably -H, a Ci -7 alkyl group, or a C 5 . 20 aryl group.
  • phosphoramidite groups include, but are not limited to, -OP(OCH 2 CH 3 )-N(CH 3 ) 2 ,
  • Phosphoramidate -OP( s5 0)(OR 1 )-NR 2 3.
  • R 1 and R 2 are phosphoramidate substituents, for example, -H, a optionally substituted) c v7 alkyl group, a (3 ⁇ 4.3 ⁇ 4> heterocyclyl group, or a C ⁇ -2o aryl group, preferably -H, a C ⁇ r alkyl group, or a 05.20 aryl group.
  • * C 3 . 12 aikylene*. as used herein, pertains to a bidentate moiety obtained by * removing two hydrogen atoms, either both from the same carbon atom, or one from each of two different carbon atoms, of a hydrocarbon compound having from 3 to 12 carbon atoms (unless otherwise specified), which may be a!iphatic or alicyclic, and which may be saturated, partially unsaturated, or fully unsaturated.
  • the term "aikyiene” includes the sub-classes afkenylene, alkynylene, cycioalkyiene, etc., discussed below.
  • linear saturated C aikyiene groups include, but are not limited to, -(CH 2 ) n - where n is an integer from 3 to 12, for example, -CH 2 CH 2 CH 2 - (propylene),
  • Examples of branched saturated C 3 ⁇ 4. ⁇ ,;: ⁇ a!kyiene groups include, but are not limited to, -CH(CH 3 )CHr, -CH(CH 3 )CH 2 CHr . -CH(CH 3 )CH 2 CH 2 CH 2 -, -CH 2 CH(CH 3 )CH 2 -,
  • Examples of a!icyciic saturated Cs. s2 aiky!ene groups include, but are not limited to, cyclopentylene (e.g. cyclopent-1 ,3-ylene), and cyclohexylene
  • C 3-12 cycloalkylenes examples include, but are not limited to, cyclopentenylene (e.g. 4-cyclopenten-1 ,3-ylene), cyciohexenyiene (e.g. 2-cyclohexen-1 ,4-ylene; 3-cyclohexen-1 ,2-ylene; 2,5-cyclohexadien- 1 ,4-ylene).
  • cyclopentenylene e.g. 4-cyclopenten-1 ,3-ylene
  • cyciohexenyiene e.g. 2-cyclohexen-1 ,4-ylene; 3-cyclohexen-1 ,2-ylene; 2,5-cyclohexadien- 1 ,4-ylene.
  • a reference to carboxyfie acid also includes the anionic (carboxyiate) form (-COO ), a salt or solvate thereof, as well as conventional protected forms.
  • a reference to an amino group includes the protonated form (-N + HR 1 R 2 ), a salt or solvate of the amino group, for example, a hydrochloride salt, as well as conventional protected forms of an amino group.
  • a reference to a hydroxyl group also includes the anionic form ⁇ -O " ), a salt or solvate thereof, as well as conventional protected forms.
  • a corresponding salt of the active compound for example, a pharmaceutically-acceptable salt.
  • a pharmaceutically-acceptable salt examples are discussed in Berge, er a/., J. Pharm. Sci., 66, 1-19 (1977).
  • a salt may be formed with a suitable cation.
  • suitable inorganic cations include, but are not limited to, alkali metal ions such as Na + and K ' ⁇ alkaline earth cations such as Ca 2* and Mg 2 ⁇ and other cations such as ⁇ 3 .
  • suitable organic cations include, but are not limited to, ammonium ion (i.e. NH 4 + ) and substituted ammonium ions ⁇ e.g. NH 3 R ⁇ , NH 2 R a ⁇ , NHR 3 ⁇ NfV).
  • suitable substituted ammonium ions are those derived from: ethy!amine, dtethylamine,
  • a common quaternary ammonium ion is N ⁇ CH ? ,) . If the compound is cationic, or has a functional grou which may be cationic (e.g. -NH S may be -NH 3 *) « then a salt may be formed with a suitable anion.
  • tnorganic anions include, but are not limited to, those derived from the following inorganic acids: hydrochloric, hydrobromic, hydroiodic, sulfuric, sulfurous, nitric, nitrous, phosphoric, and phosphorous.
  • Suitable organic anions include, but are not limited to, those derived from the following organic acids: 2-acetyoxybenzoic, acetic, ascorbic, aspartic, benzoic, camphorsulfonic, cinnamic, citric, edetic, ethanedisulfonic, ethanesulfonic, fumaric, glucheptonic, gluconic, glutamic, glycolic, hydroxymaleic, hydroxynaphthalene carboxylic, isethionic, lactic, lactobionic, lauric, maleic, malic, methanesulfonic, mucic, oleic, oxalic, palmitic, pamoic, pantothenic, phenylacetic, phenylsulfonic, propionic, pyruvic, salicylic, stearic, succinic, sulfanilic, tartaric, toluenesulfonic, trifluoroacetic acid and valeric.
  • Suitable polymeric organic anions include, but are not limited to, those derived from the following polymeric acids: tannic acid, carboxymethyl cellulose.
  • solvate is used herein in the conventional sense to refer to a compSex of solute (e.g. active compound, salt of active compound) and solvent. If the solvent is water, the solvate may be conveniently referred to as a hydrate, for example, a mono-hydrate, a di-hydrate, a tri-hydrate, etc.
  • the invention includes compounds where a solvent adds across the imine bond of the PBD moiety, which is illustrated below where the solvent is water or an alcohol (R A OH, where R A is C: alkyt):
  • the balance of these equilibria depend on the conditions in which the compounds are found, as well as the nature of the moiety itself.
  • Certain compounds of the invention may exist in one or more particular geometric, optical, enantiomeric, diasteriomeric, epimeric, atropic, stereoisomeric, tautomeric, conformational, or anomeric forms, including but not limited to, cis- and trans-forms; E- and Z-forms; c-, t-, and r- forms; endo- and exo-forms; R-, S-, and meso-forms; D- and L-forms; d- and l-forms; (+) and (-) forms; keto-, enol-, and enolate-forms; syn- and anti-forms; synclinal- and anticlinal-forms; a- and ⁇ -forms; axial and equatorial forms; boat-, chair-, twist-, envelope-, and halfchair-forms; and combinations thereof, hereinafter collectively referred to as "isomers” (or "isomeric forms").
  • chiral refers to molecules which have the property of non-superimposability of the mirror image partner, while the term “achiral” refers to molecules which are superimposable on their mirror image partner.
  • stereoisomers refers to compounds which have identical chemical constitution, but differ with regard to the arrangement of the atoms or groups in space.
  • Diastereomer refers to a stereoisomer with two or more centers of chirality and whose molecules are not mirror images of one another. Diastereomers have different physical properties, e.g. melting points, boiling points, spectral properties, and reactivities. Mixtures of diastereomers may separate under high resolution analytical procedures such as electrophoresis and chromatography.
  • Enantiomers refer to two stereoisomers of a compound which are non-superimposable mirror images of one another. Stereochemical definitions and conventions used herein generally follow S. P. Parker, Ed., McGraw-Hill Dictionary of Chemical Terms (1984) McGraw-Hill Book Company, New York; and Eiiel, E, and Wiien, S.. "Stereochemistr of Organic Compounds", John Wiley & Sons, inc., New York, 1 S94. The compounds of the invention may contain asymmetric or chirai centers, and therefore exist in different stereoisomer ⁇ forms. It is intended that aS!
  • stereoisomeric forms of the compounds of the invention including but not limited to, diastereomers, enantiomers and atropisomers, as well as mixtures thereof such as racemic mixtures, form part of the present invention.
  • Many organic compounds exist in optically active forms, i.e., they have th ability to rotate the plane of plane-polarized light.
  • the prefixes D and L, or R and S are used to denote the absolute configuration of the molecule about its chiral center ⁇ s).
  • the prefixes d and I or (+) and (-) are employed to designate the sign of rotation of plane-polarized light by the compound, with (-) or I meaning that the compound is levorotatory.
  • a compound prefixed with (+) or d is dextrorotatory.
  • these stereoisomers are identica! except that they are mirror images of one another.
  • a specific stereoisomer may also be referred to as an enantiomer, and a mixture of such isomers is often called an enantiomeric mixture.
  • a 50:50 mixture of enantiomers is referred to as a racemic mixture or a racemate, which may occur where there has been no stereoselection or stereospecificity in a chemical reaction or process.
  • the terms “racemic mixture” and “racemate” refer to an equimolar mixture of two enantiomeric species, devoid of optical activity.
  • isomers are structural (or constitutional) isomers (i.e. isomers which differ in the connections between atoms rather than mereiy by the position of atoms in space).
  • a reference to a methoxy group, -OCH 3 ⁇ 4 is not to be construed as a reference to its structural isomer, a hydroxymethyl group, -CH 2 OH.
  • a reference to ort o-chlorophenyi is not to be construed as a reference to its structural isomer, meta- eniorophenyi.
  • a reference to a class of structures may well include structurally isomeric forms failing within that ciass (e.g. C ⁇ alkyl includes n-propyl and iso-propyl; butyl includes n ⁇ , iso-, sec-, and tert-butyl; methoxyphenyl includes ortho-, meta-, and para- methoxypheny!).
  • ciass e.g. C ⁇ alkyl includes n-propyl and iso-propyl; butyl includes n ⁇ , iso-, sec-, and tert-butyl; methoxyphenyl includes ortho-, meta-, and para- methoxypheny!.
  • keto/enol (illustrated below), imine/enamine, ami.de/imino alcohol, amidine/amidine, nitroso/oxime,
  • tautomer or “tautomeric form” refers to structural isomers of different energies which are interconvertible via a iow energy barrier.
  • proton tautomers also known as prototropic tautomers
  • Valence tautomers include interconversions by reorganization of some of the bonding electrons.
  • H may be in any isoiopic form, including 1 ⁇ 4 3 H (D), and s H (T); C may be in any isotopic form, including 2 C, 13 C, and C; O may be in any Isotopic form, including 16 0 and 8 0; and the like.
  • isotopes examples include isotopes of hydrogen, carbon, nitrogen, oxygen, phosphorous, fluorine, and chlorine, such as, but not limited to *H (deuterium, D), 3 H (tritium), 11 C, 3 C, t C, 15 N, !S F, 31 P, 3a P, 3S S, CI, and t2b ⁇ .
  • isotopicaliy labeled compounds of the present invention for example those into which radioactive isotopes such as 3H, 13C, and 14C are incorporated.
  • Such isotopicaliy labelled compounds may be useful in metabolic studies, reaction kinetic studies, detection or imaging techniques, such as positron emission tomography (PET) or single- photon emission computed tomography (SPECT) including drug or substrate tissue distribution assays, or in radioactive treatment of patients.
  • Deuterium labelled or substituted therapeutic compounds of the invention may have improved D PK (drug metabolism and pharmacokinetics) properties, relating to distribution., metabolism, and excretion ADME). Substitution with heavier isotopes such as deuterium may afford certain therapeutic advantages resulting from greater metabolic stability, for example increased in vivo half-life or reduced dosage requirements.
  • isotopicaliy labeled compounds of this invention and prodrugs thereof can generally be prepared by carrying out the procedures disclosed in the schemes or in the examples and preparations described below by substituting a readily available isotopicaliy labeled reagent for a non-tsotopical!y labeled reagent.
  • substitution with heavier isotopes, particularly deuterium (i.e., 2H or D) may afford certain therapeutic advantages resulting from greater metabolic stability, for example increased in vivo half-life or reduced dosage requirement or an improvement in therapeutic index. It is understood that deuterium in this context is regarded as a substituent.
  • concentration of such a heavier isotope, specifically deuterium may be defined by an isotopic enrichment factor.
  • any atom not specifically designated as a particular isotope is meant to represent any stable isotope of that atom.
  • a reference to a particular compound includes all such isomeric forms, including (wholly or partially) racemic and other mixtures thereof.
  • Methods for the preparation (e.g. asymmetric synthesis) and separation (e.g. fractional crystallisation and chromatographic means) of such isomeric forms are either known in the art or are readily obtained by adapting the methods taught herein, or known methods, in a known manner.
  • the cytotoxic or cytostatic activity of an antibody-drug conjugate is measured by: exposing mammalian cells having receptor proteins, e.g. HE 2, to the antibody of the ADC in a cell culture medium; culturing the cells for a period from about 6 hours to about 5 days; and measuring ceil viability.
  • Cell-based in vitro assays are used to measure viability ⁇ proliferation), cytotoxicity, and induction of apoptosis (caspase activation) of an ADC of the invention.
  • the in vita potency of aniibody-drug conjugates can be measured by a cell proliferation assay.
  • the CeliTfter-Gio ® Luminescent Ce!! Viability Assay is a commercially available ⁇ Promega Corp., Madison, i), homogeneous assay method based on the recombinant expression of Coteopte iuciferase (US Patent Nos. 5583024; 5674713 and 5700670).
  • This ceil proliferation assay determines the number of viable cells in culture based on quantitation of the ATP present, an indicator of metaboiicaly active ceils (Crouch et a! (1993) J. Immunol, Meth. 160:81-88; US 6602677).
  • the CeilTiter-G!o ® Assay is conducted in 96 wet! format, making it amenable to automated high-throughput screening (HTS (Cree et at ⁇ 1996) Anticancer Drugs 6; 398-404 ),
  • the homogeneous assay procedure involves adding the single reagent (GeilTiter-Gio ® Reagent) directly to cells cultured in serum-supplemented medium. Cell washing, removal of medium and multiple pipetting steps are not required.
  • the system detects as few as 15 DCis/wei! in a 384-weli formal in 10 minutes after adding reagent and mixing.
  • the ceils may be treated continuousiy with ADC, or they may be treated and separated from ADC. Generally, ceils treated briefly, i.e. 3 hours, showed the same potency effects as continuously treated cells.
  • the homogeneous "add-mix-measure" format results in ce!i lysis and generation of a luminescent signal proportional to the amount of ATP present.
  • the amount of ATP is directly proportional to the number of cells present in culture.
  • the CeliTiter-G!o ® Assay generates a "glow-type" luminescent signal, produced by the Iuciferase reaction, which has a half-life generally greater than five hours, depending on ceil type and medium used. Viable DCis are reflected in relative luminescence units (RLU).
  • RLU relative luminescence units
  • the substrate. Beetle Lucifenn is oxidatively decarboxylated by recombinant firefly Iuciferase with concomitant conversion of ATP to AMP and generation of photons.
  • the in vivo efficacy of antibody-drug conjugates (ADC) of the invention can be measured by tumor xenograft studies in mice.
  • ADC antibody-drug conjugates
  • an anti-HER2 ADC of the invention can be measured by a high expressing HERS transgenic expiant ' mouse model.
  • An allograft is propagated from the Fo5 mmtv transgenic mouse which does not respond to, or responds poorly to, HERCEPTIN® therapy.
  • Subjects were treated once with ADC at certain dose levels (mg/kg) and PBD drug exposure ( g/m 2 ); and placebo buffer control (Vehicle) and monitored over two weeks or more to measure the time to tumor doubling, log cell kill, and tumor shrinkage.
  • the conjugates of the invention may be used to provide a PBD compound at a target location.
  • the target location is preferably a proliferative cell population.
  • the antibody is an antibody for an antigen present in a proliferative cell population.
  • the antigen is absent or present at a reduced level in a non-proliferative cell population compared to the amount of antigen present in the proliferative cell population, for example a tumour cell popuiation.
  • the Sinker may be cleaved so as to release a compound of formulae B or C
  • the conjugate may be used to selectively provide a compound of formulae B or C to the target location.
  • the linker may be cleaved by an enzyme present at the target location.
  • the target location may be in vitro, in vivo or &x vivo.
  • the antibody-drug conjugate (ADC) compounds of the invention include those with utility for anticancer activity, in particular, the compounds include an antibody conjugated, i.e.
  • ADC antibody-drug conjugates
  • the present invention provides a conjugate compound as described herein for use in therapy.
  • conjugate compound as described herein for use in the treatment of a proliferative disease.
  • a second aspect of the present invention provides the use of a conjugate compound in the manufacture of a medicament for treating a proliferative disease.
  • proliferative disease pertains to an unwanted or uncontrolled cellular proliferation of excessive or abnormal cells which is undesired, such as, neoplastic or hyperplastic growth, whether in vitro or in vivo.
  • proliferative conditions i-nciude, but are not limited to, benign, pre-malignant, and malignant DCluiar proliferation, including but not limited to, neoplasms and tumours (e.g. histocytoma, glioma, asirocyoma, osteoma), cancers (e.g.
  • lung cancer small cell lung cancer, gastrointestinal cancer, bowel cancer, colon cancer, breast carinoma, ovarian carcinoma, prostate cancer, testicular cancer, liver cancer, kidney cancer, bladder cancer, pancreas cancer, brain cancer, sarcoma, osteosarcoma, Kaposi's sarcoma, melanoma), leukemias, psoriasis, bone diseases, fibroproliferative disorders (e.g. of connective tissues), and atherosclerosis.
  • Cancers of particular interest include, but are not limited to, leukemias and ovarian cancers.
  • ceil Any type of ceil may be treated, including but not limited to, lung, gastrointestinal (including, e.g. bowel colon), breast (mammary), ovarian, prostate, liver (hepatic), kidney (renal), bladder, pancreas, brain, and skin.
  • the treatment is of a pancreatic cancer.
  • the treatment is of a tumour having ⁇ ⁇ ⁇ 6 integrin on the surface of the cell.
  • the antibody-drug conjugates (ADC) of the present invention may be used to treat various diseases or disorders, e.g. characterized by the overexpression of a tumor antigen.
  • exemplary conditions or hyperproliferative disorders include benign or malignant tumors; leukemia, haematological, and lymphoid malignancies.
  • Others include neuronal, glial, astrocytes, hypothalamic, glandular, macrophagal, epithelial, stromal, biastocoe!ic.
  • inflammatory, angiogenic and immunologic including autoimmune, disorders.
  • the disease or disorder to be treated is a hyperpro!sferative disease suc as cancer.
  • cancers to be treated herein include, but are not limited to, carcinoma, lymphoma, blastoma, sarcoma, and leukemia or lymphoid malignancies. More particular examples of such cancers include squamous cell cancer ⁇ e.g.
  • lung cancer including small-cell lung cancer, non-small cell lung cancer, adenocarcinoma of the lung and squamous carcinoma of the lung, cancer of the peritoneum, hepatocellular cancer, gastric or stomach cancer including gastrointestinal cancer, pancreatic cancer, glioblastoma, cervical cancer, ovarian cancer, liver cancer, bladder cancer, hepatoma, breast cancer, colon cancer, rectal cancer, colorectal cancer, endometrial or uterine carcinoma, salivary gland carcinoma, kidney or renal cancer, prostate cancer, vulval cancer, thyroid cancer, hepatic carcinoma, anal carcinoma, penile carcinoma, as well as head and neck cancer.
  • lung cancer including small-cell lung cancer, non-small cell lung cancer, adenocarcinoma of the lung and squamous carcinoma of the lung, cancer of the peritoneum, hepatocellular cancer, gastric or stomach cancer including gastrointestinal cancer, pancreatic cancer, glioblastoma, cervical cancer, ovarian cancer, liver cancer,
  • Autoimmune diseases for which the ADC compounds may be used in treatment include rheun atologic disorders (such as, for example, rheumatoid arthritis, Sjogren's syndrome, scleroderma, lupus such as SLE and lupus nephritis, polymyositis/dermatomyositis, cryoglobulinemia, anti-phospholipid antibody syndrome, and psoriatic arthritis), osteoarthritis, autoimmune gastrointestinal and liver disorders (such as, for example, inflammatory bowel diseases (e.g.
  • vasculitis ⁇ such as, for example, ANCA-associated vasculitis, including Ghurg-Strauss vasculitis, Wegener's granulomatosis, and polyarteriitis
  • autoimmune neurological disorders such as, for example, multiple sclerosis, opsoclonus myoclonus syndrome, myasthenia gravis, neuromyelitis optica, Parkinson's disease, Alzheimer's disease, and autoimmune polyneuropathies
  • renal disorders such as, for example, glomerulonephritis, Goodpasture's syndrome, and Berger's disease
  • autoimmune dermatologic disorders such as, for example, psoriasis, urticaria, hives, pemphigus vulgaris, bullous pemphigoid
  • Graves ' disease and thyroiditis More preferred such diseases include, for example, rheumatoid arthritis, ulcerative colitis, A CA-associated vasculitis, lupus, multiple sclerosis, Sjogren's syndrome, Graves 1 disease, IDDM, pernicious anemia, thyroiditis, and
  • the conjugates of the present invention may be used in a method of therapy.
  • a method of treatment comprising administering to a subject in need of treatment a therapeutically-effective amount of a conjugate compound of the invention.
  • therapeutically effective amount is an amount sufficient to show benefit to a patient. Such benefit may be at least amelioration of at least one symptom.
  • the actual amount administered, and rate and time-course of administration, will depend on the nature and severity of what is being treated. Prescription of treatment, e.g. decisions on dosage, is within the responsibility of general practitioners and other medical doctors.
  • a compound of the invention may be administered alone or in combination with other treatments, either simultaneously or sequeniially dependent upon the condition to be treated. Examples of treatments and therapies include, but are not limited to, chemotherapy (the administration of active agents, including, e.g. drugs, such as chemotherapeutics); surgery; and radiation therapy.
  • chemotherapeutic agent is a chemical compound useful in the treatment of cancer, regardless of mechanism of action.
  • Classes of chemotherapeutic agents include, but are not limited to; alkylating agents, antimetabolites, spindle poison plant alkaloids,
  • Chemotherapeutic agents include compounds used in "targeted therapy” and conventional chemotherapy.
  • chemotherapeutic agents include: erlotinib (TARCEVA®, Genentech/OSI Pharm.), docetaxei (TAXOTERE®, Sanofi-Aventis), 5-FU (fluorouracil, 5-fluorouracil, CAS No. 51-21-8), gemcftabine (GEMZAR®, Uliy), PD-0325901 (CAS No. 391210-10-9, Pfizer), cispiaiin (cis-diamine, dicihioropiaiinum(ll), CAS No. 15663-27-1 ), carbop!attn (CAS No. 41575-94-4), paciitaxe! (TAXOL®.
  • trastuzumab HERCEPTIN®, Genentech
  • temozolomide 4-methyi-5-oxo- 2,3,4,6,8- pentazabicyc!o [4.3.0] nona-2,7,9-triene- 9-carboxamide, CAS No. 85622-93-1,
  • TE QDAR® TE QDAR®, TEMODAL®, Schenng Plough
  • tamoxifen (Z ⁇ -2-[4-(1 ,2-diphenyIbuM- enyl)phenoxy]-W,/V-dimethylethanamine, NOLVADEX®, iSTUBAL®, VALODEX®), and doxorubicin (ADR!AMYC!N®), Akti-1/2, HPPD, and rapamycin.
  • chemoiherapeutic agents include: oxalip!aiin (ELOXAT!N®, Sanofi), bortezomib (VELCADE®, Millennium Pharm.), sutent ⁇ SUN!TiNIB®, 3011248, Pfizer), leirozole (FEMARA®, NGvartis), imaiinib mesylate (GIEEVEC®, Novartis), XL-518 (SVSek inhibitor, Exelixis, WO 2007/044515), ARRY-886 ( ek inhibitor, AZD6244, Array BioPharma, Astra Zeoeca), SF-1126 (P13K inhibitor, Semafore Pharmaceuticals), BEZ-235 (PI3K inhibitor, Novartis), XL-147 (PI3K inhibitor, Exelixis), PTK787/ZK 222584 ⁇ Novariis), fuivestrant (FASLODEX®, AstraZeneca), !eucovor
  • sulfonates such as busulfan, improsulfan and piposulfan; aziridines such as benzodopa, carboquone, meturedopa, and uredopa; ethylenimines and methylamelamines including altretamine, triethylenemelamine, triethylenephosphoramide, triethylenethiophosphoramide and trimethylomelamine; acetogenins (especially bullatacin and bullatacinone); a camptoihecsn ⁇ including the synthetic analog topotecan); bryostatin; caSiysiatin; CC-1065 (including its adozelesin, carzelesin and bizelesin synthetic analogs); crypiophycins (particularly cryptophycin 1 and cryptophycin 8); dolastatin; duocarmycin (including the synthetic analogs, KW-2189 and CB1-TM1 ); eleutherobin; pancratistatin; a sarcodict
  • caiieheamicin calicheamicin gamma 11, caiieheamicin omega! 1 ⁇ Angew Chew. Mi. Ed. Engt. (1994) 33:183-186); dynemicin, dynemicin A; bisphosphonates, such as clodronate; an
  • esperamicin as vveil as neocarzinostatin chromophore and related chromoprotein enediyne antibiotic chromophores), aciacinomysins, actinomycin, authramycin, azaserine, bleomycins, cactinomycin, carabicin, carminomycin, carzinophilin, chromomycinis, dactinomycin, daunorubicin, detorubicin, 6-diazo-5-oxo-L-norleucine, morpholino-doxorubicin, cyanomorpholino-doxorubicin, 2-pyrrolino-doxorubicin and deoxydoxorubicin), epirubicin, esorubicin, idarubicin, nemorubicin, marcellomycin, mitomycins such as mitomycin C, mycophenolic acid, nogalamycin, olivomycins, peplomycin, por
  • etoglucid gallium nitrate; hydroxyurea; lenttnan; lonidainine; maytansinoids such as maytansine and ansamiiocins; mitoguazone; mitoxantrone; mopidanmol; nitraerine;
  • vinblastine eioposide (VP-16); ifosfamide; mitoxantrone; vincristine; vinorelbine
  • NAVELBINE® novantrone
  • teniposide edatrexate
  • daunomycin aminopterin
  • capecitabine XELODA®, Roche
  • ibandronate CPT-1 1 ; iopoisomerase inhibitor RFS 2000;
  • D FO dif!uororneihyiornithtne
  • retinoids such as retinoic acid
  • pharmaceutically acceptable salts, acids and derivatives of any of the above are dif!uororneihyiornithtne (D FO); retinoids such as retinoic acid; and pharmaceutically acceptable salts, acids and derivatives of any of the above.
  • chemoiherapeutic agent includes: (i) anti-hormonal agents that act to regulate or inhibit hormone action on tumors such as anti-estrogens and selective estrogen receptor modulators (SERMs), including, for example, tamoxifen (including NOLVADEX®; tamoxifen citrate), raloxifene, ⁇ .raloxifene, 4-hydroxytamoxifen, rioxifene, keoxifene, LY1 17018, onapristone, and FARESTON® (toremifine citrate); (ii) aromatase inhibitors that inhibit the enzyme aromatase, which regulates estrogen production in the adrenal glands, such as, for example, 4 ⁇ 5 ⁇ -imi a2oies, aminoglutethimide, MEGASE ⁇
  • SERMs selective estrogen receptor modulators
  • chemotherapeuiic agent therapeutic antibodies such as aiemtuzumab (Campath), bevacizumab (AVAST! N®, Genentech); cetuximab
  • panitumumab VECTIBSX®, Amgen
  • rituximab RSTUXAN®, Genentech/Biogentician
  • pertuzumab OPNfTARGTM, 2C4.
  • trastuzumab HERCEPTSN®, Genentech
  • tositumomab Bexxar, Corixia
  • antibody drug conjugate
  • Humanized monoclonal antibodies with therapeutic potential as chemotherapeuiic agents in combination with the conjugates of the invention include: aiemtuzumab, apolizumab, aselizumab, atlizumab, bapineuzumab, bevacizumab, bivatuzumab mertansine, cantuzumab mertansine, cedelizumab, certolizumab pegol, cidfusituzumab, cidtuzumab, daclizumab, eculizumab, efalizumab, epratuzumab, erlizumab, felvizumab, fontolizumab, germtuzumab ozogamicin, inotuzumab ozogamicin, ipilimumab, labetuzumab, lintuzumab, matuzumab, mepolizumab, motavizumab,
  • tacatuzumab tetraxetan tadocizumab, talizumab, tefibazumab, tocilizumab, toralizumab, trastuzumab, tucotuzumab celmoleukin, tucusituzumab, umavizumab, urtoxazumab, and visilizumab.
  • compositions according to the present invention may comprise, in addition to the active ingredient, i.e. a conjugate compound, a pharmaceutically acceptable excipient, carrier, buffer, stabiliser or other materials well known to those skilled in the art. Such materials should be non-toxic and should not interfere with the efficacy of the active ingredient.
  • a pharmaceutically acceptable excipient e.g. a conjugate compound
  • carrier e.g. a pharmaceutically acceptable excipient
  • buffer e.g. cutaneous, subcutaneous, or intravenous.
  • compositions for oral administration may be in tablet, capsule, powder or liquid form
  • a tablet may comprise a solid carrier or an adjuvant.
  • Liquid pharmaceutical compositions generally comprise a liquid carrier such as water, petroleum, animal or vegetable oils, mineral oil or synthetic oil. Physiological saline solution, dextrose or other saccharide solution or glycols such as ethylene glycol, propylene glycol or polyethylene glycol may be included.
  • a capsule may comprise a solid carrier such a gelatin.
  • the active ingredient will be in the form of a parenteral ⁇ acceptabie aqueous solution which is pyrogen-free and has suitable pH, isotonicity and stability.
  • a parenteral ⁇ acceptabie aqueous solution which is pyrogen-free and has suitable pH, isotonicity and stability.
  • isotonic vehicles such as Sodium Chloride Injection, Ringer's Injection, Laciated Ringer's Injection, Preservatives, stabilisers, buffers, antioxidants and/or other additives may be included, as required, Formulations
  • conjugate compound While it is possible for the conjugate compound to be used (e.g., administered) alone, it is often preferable to present it as a composition or formulation.
  • the composition is a pharmaceutical composition (e.g., formulation, preparation, medicament) comprising a conjugate compound, as described herein, and a pharmaceutically acceptable carrier, diluent, or excipient.
  • a pharmaceutical composition e.g., formulation, preparation, medicament
  • a pharmaceutically acceptable carrier e.g., diluent, or excipient.
  • the composition is a pharmaceutical composition comprising at least one conjugate compound, as described herein, together with one or more other pharmaceutically acceptable ingredients well known to those skilled in the art, including, but not limited to, pharmaceutically acceptable carriers, diluents, excipients, adjuvants, fillers, buffers, preservatives, anii-oxidants, lubricants, stabilisers, solubilisers, surfactants (e.g., wetting agents ⁇ , masking agents, colouring agents, flavouring agents, and sweetening agents.
  • the composition further comprises other active agents, for example, other therapeutic or prophylactic agents.
  • Suitable carriers, diluents, excipients, etc. can be found in standard pharmaceutical texts. See, for example, Handbook of Pharmaceutical Additives. 2 ⁇ Edition (eds. M. Ash and I, Ash ⁇ ,. 2001 (Synapse Information Resources, Inc., Ertdicott, New York, USA), Remington's Pharmaceutical Sciences. 20th edition, pub. Lippincott, Williams & Wifkins, 2000; and
  • Another aspect of the present invention pertains to methods of making a pharmaceutical composition
  • a pharmaceutical composition comprising admixing at least one [ 15 C]-radioiabelled conjugate or conjugate-like compound, as defined herein, together with one or more other pharmaceulicaily acceptable ingredients well known to those skilled in the art, e.g., carriers, diluents, excipients, etc, if formulated as discrete units (e.g., tablets, etc.), each unit contains a predetermined amount (dosage) of the active compound.
  • compositions are, within the scope of sound medical judgment, suitable for use in contact with the tissues of the subject in question (e.g., human) without excessive toxicity, irritation, allergic response, or other problem or complication, commensurate with a reasonable benefit/risk ratio.
  • Each carrier, diluent, excipient, etc. must also be “acceptable” in the sense of being compatible with the other ingredients of the formulation.
  • the formulations may be prepared by any methods well known in the art of pharmacy. Such methods include the step of bringing into association the active compound with a carrier which constitutes one or more accessory ingredients. In general, the formulations are prepared by uniformly and intimately bringing into association the active compound with carriers (e.g., liquid carriers, finely divided solid carrier, etc.), and then shaping the product, if necessary.
  • carriers e.g., liquid carriers, finely divided solid carrier, etc.
  • the formulation may be prepared to provide for rapid or slow release; immediate, delayed, timed, or sustained release; or a combination thereof.
  • Formulations suitable for parenteral administration include aqueous or non-aqueous, isotonic, pyrogen-free, sterile liquids (e.g., solutions, suspensions), in which the active ingredient is dissolved, suspended, or otherwise provided (e.g., in a liposome or other mrcroparticuiate).
  • Such liquids may additional contain other pharmaceutically acceptable ingredients, such as anti-oxidants, buffers, preservatives, stabilisers, bacteriostats, suspending agents, thickening agents, and solutes which render the formulation isotonic with the blood (or other relevant bodily fluid) of the intended recipient.
  • excipients include, for example, water, alcohols, polyols, glycerol, vegetable oiis, and the like.
  • suitable isotonic carriers for use in such formulations include Sodium Chloride Injection, Ringer's. Solution, or Laciated Ringer's Injection.
  • the concentration of the active ingredient in the liquid is from about 1 ng/mi to about 10 Mg mi, for example from about 10 ng/ml to about 1 pg/ml.
  • the formulations may be presented in unit-dose or multi-dose sealed containers, for example, ampoules and vials, and may be stored in a freeze-dried (lyophilised) condition requiring only the addition of the sterile liquid carrier, for example water for injections, immediately prior to use. Extemporaneous injection solutions and suspensions ma be prepared from sterile powders, granules, and tablets.
  • appropriate dosages of the conjugate compound, and compositions comprising the conjugate compound can vary from patient to patient. Determining the optimal dosage will generally involve the balancing of the level of therapeutic benefit against any risk or deleterious side effects.
  • the selected dosage level wfii depend on a variety of factors including, but not limited to, the activity of the particular compound, the route of administration, the time of administration, the rate of excretion of the compound, the duration of the treatment, other drugs, compounds, and/or materials used in combination, the severity of the condition, and the species, sex, age, weight, condition, general health, and prior medical history of the patient.
  • the amount of compound and route of administration will ultimately be at the discretion of the physician, veterinarian, or clinician, although generally the dosage will be selected to achieve local concentrations at the site of action which achieve the desired effect without causing substantial harmful or deleterious side-effects.
  • Administration can be effected in one dose, continuously or intermittently (e.g., in divided doses at appropriate intervals) throughout the course of treatment. Methods of determining the most effective means and dosage of administration are well known to those of skill in the art and will vary with the formulation used for therapy, the purpose of the therapy, the target DCi(s) being treated, and the subject being treated. Single or multiple administrations can be carried out with the dose level and pattern being selected by the treating physician, veterinarian, or clinician.
  • a suitable dose of the active compound is in the range of about 100 ng to about 25 mg (more typically about 1 pg to about 10 mg) per kilogram body weight of the subject per day.
  • the active compound is a salt, an ester, an amide, a prodrug, or the like
  • the amount administered is calculated on the basis of the parent compound and so the actual weight to be used is increased proportionately.
  • the active compound is administered to a human patient according to the following dosage regime: about 10Q mg, 3 times daily.
  • the active compound is administered to a human patient according to the following dosage regime; about 150 mg, 2 times daily.
  • the active compound is administered to a human patient according to the following dosage regime: about 200 mg, 2 times daily.
  • the conjugate compound is administered to a human patient according to the following dosage regime: about 50 or about 75 mg, 3 or 4 times daily.
  • the conjugate compound is administered to a human patient according to the following dosage regime: about 100 or about 125 mg, 2 times daiiy,
  • the dosage amounts described above may apply to the conjugate ⁇ including the PBD moiety and the linker to the antibody) or to the effective amount of PBD compound provided, for example the amount of compound that is releasable after cleavage of the linker.
  • an ADC of the invention will depend on the type of disease to be treated, as defined above, the severity and course of the disease, whether the molecule is administered for preventive or therapeutic purposes, previous therapy, the patient's clinical history and response to the antibody, and the discretion of the attending physician.
  • the molecule is suitably
  • a typical daily dosage might range from about 1 g kg to 100 mg/kg or more, depending on the factors mentioned above.
  • An exemplary dosage of ADC to be administered to a patient is in the range of about 0.1 to about 10 mg/kg of patient weight. For repeated administrations over several days or longer, depending on the condition, the treatment is sustained until a desired suppression of disease symptoms occurs.
  • An exemplary dosing regimen comprises a course of administering an initial loading dose of about 4 mg/kg, followed by additional doses every week, two weeks, or three weeks of an ADG. Other dosage regimens may be useful. The progress of this therapy is easily monitored by conventional techniques and assays.
  • treatment,' 1 in the context of treating a condition, pertains generally to treatment and therapy, whether of a human or an animal ⁇ e.g., in veterinary applications), in which some desired therapeutic effect is achieved, for example, the inhibition of the progress of the condition, and includes a reduction in the rate of progress, a halt in the rate of progress, regression of the condition, amelioration of the condition, and cure of the condition.
  • Treatment as a prophylactic measure i.e., prophylaxis, prevention
  • prophylactic measure i.e., prophylaxis, prevention
  • terapéuticaally-effective amount pertains to that amount of an active compound, or a material, composition or dosage from comprising an active compound, which is effective for producing some desired therapeutic effect, commensurate with a reasonable benefit/risk ratio, when administered in accordance with a desired treatment regimen.
  • prophylactically-effective amount refers to that amount of an active compound, or a material, composition or dosage from comprising an active compound, which is effective for producing some desired prophylactic effect, commensurate with a reasonable benefit/risk ratio, when administered in accordance with a desired treatment regimen.
  • Antibody drug conjugates may be prepared by several routes, employing organic chemistry reactions, conditions, and reagents known to those skilled in the art, including; (1 ) reaction of a nucieophiiic group of an antibody with a bivalent linker reagent, to form antibody-!inker intermediate Ab-L, via a covIER bond, followed by reaction with an activated drug moiety reagent ; and (2) reaction of a drug moiety reagent with a linker reagent, to form drug-linker reagent D ⁇ L, via a covended bond, followed by reaction with the nucleophilic of an antibody. Conjugation methods (1) and (2) may be employed with a variety of antibodies, and linkers to prepare the antibody-drug conjugates of the invention.
  • Nucleophilic groups on antibodies include, but are not limited to side chain thiol groups, e.g. cysteine.
  • Thiol groups are nucleophilic and capable of reacting to form covending bonds with electrophilic groups on linker moieties such as those of the present invention.
  • Certain antibodies have reducible interchain disulfides, i.e. cysteine bridges.
  • Antibodies may be made reactive for conjugation with linker reagents by treatment with a reducing agent such as DTT (Cfeian 's reagent, dithiothreitoi) or TCEP ⁇ iris ⁇ 2-carboxyethyi)phQsphine hydrochloride; Getz ei a! (1999) Anal. Biochem.
  • the subject patient may be an animal, mammal, a placental mammal, a marsupial
  • kangaroo, wombat e.g., kangaroo, wombat
  • a monotreme e.g., duckbilled platypus
  • a rodent e.g., a guinea pig, a hamster, a rat, a mouse
  • murine e.g., a mouse
  • a lagomorph e.g., a rabbit
  • avian ⁇ e.g., a bird canine
  • feline e.g., a cat
  • equine e.g., a horse
  • porcine e.g., a pig
  • ovine e.g., a sheep
  • bovine e.g., a cow
  • a primate simian (e.g., a monkey or ape), a monkey (e.g., marmoset, baboon), an ape (e.g., gorilla, chimpanzee,
  • the subject/patient may be any of its forms of development, for example, a foetus.
  • the subject/patient is a human.
  • the patient is a population where each patient has a tumour having a v ps integrin on the surface of the cell.
  • R L represents:
  • unsymmetrical dimers with respect to their N1G-C1 bonds, may be prepared by treating bis-amino compounds of formula IV with one equivalent of a commerciaSly avaiiable ⁇ or readily prepared) chloroformate reagent in order to break the symmetry of the rnoiecu!es.
  • the remaining free amine can then be functionalised independently to introduce the linking group precursor (R L ). Further functional group manipulation to close the PBD B-ring, remove protecting groups affords the target molecule.
  • Compounds of formula iV are typically prepared by coupling a suitably functionalised C-ring fragment (!) to an A-ring containing dimer core of formula II.
  • C-ring fragments may be prepared from known carbamate protected methyi 4-oxoproSinate buiiding blocks.
  • Oiefination under Witts g or Horner-Emmons conditions can be employed to furnish &ndo- or exo-unsaturated afkenes
  • C-ring and A-ring fragments can be coupled under standard conditions in the presence of triethylamine, using acid chloride derivatives of the A-ring fragments to give molecules of formula III.
  • Symmetry may also be broken at this stage by introducing different C-rings.
  • Compounds of type III can be reduced, without affecting endo or exo C-ring unsaturation, with zinc in acetic or formic acid to afford molecules of formula IV.
  • a suitable 4-hydroxy pyrrolidine building block may be coupled to a dimer core of formula II. The hydroxy!
  • Unsymmetrical carbamates of type VI can be prepared by treating bis-amines of type IV with a single equivalent of a commercially available (or readily prepared) chloroformates in the presence of pyridine or triethySamine. Chloroformates may be selected to afford appropriate carbamate based nitrogen protecting groups (Prof) which are orthogonal to those used in the pro-linker group (R L ).
  • the R L carbamate may be introduced by converting the remaining amino group to an isocyanate and quenching it with the R L alcohol. Alternatively the R L alcohol can be converted to a chloroformate or functional equivalent (fluoroformate, p-nitrocarbonate, pentafluorocarbonate or hydroxybenzotriazole carbonate). Finally, the remaining amino group can be converted to a reactive p-nitrocarbamate,
  • Molecules of formula VII can be prepared from molecules of formula VI by removing the silyl protecting groups, with, for example, aqueous acetic acid. Oxidation with Dess-Martin periodinane (or alternatively TPAP/NMO, PDC or under Swern conditions) affords the ring closed product.
  • Conjugates of formula V may be prepared from molecules of formula VII by removal of the carbamate based nitrogen protection group.
  • a conjugate of formula XVIII may be prepared from compound IX as shown in Scheme 2.
  • dimer compound (15) shown in paragraph [184] may be used as compound ⁇ Hi ⁇ in Scheme I above. This, and further adaptations, would be apparent to one of skill in the art.
  • Optical rotations were measured on an ADP 220 polarimeter (Bellingham Stanley Ltd.) and concentrations (c) are given in g/I QrnL Melting points were measured using a digital melting point apparatus ⁇ Electrothermal). IR spectra were recorded on a Perkin- Elmer Spectrum 1000 FT IR Spectrometer. 'H and !3 C N R spectra were acquired at 300 K using a Bruker Avance NMR. spectrometer at 400 and 100 MHz, respectively.
  • TLC Thin Layer Chromatography
  • a catalytic amount of anhydrous DMF (0.5 ml) was added to a stirred suspension of oxalyS chloride (9.1 g, 8.2S mL, 71.7 mmoi, 3 eq.) and dimer core (4) (11 ,82 g, 23.9 mmoi, 1 eq.) in anhydrous DGM (180 mL) at room temperature. Vigorous effervescence was observed after the addition of DMF and the reaction mixture was allowed to stir for 18 h in a round bottom flask fitted with a eaicium chloride drying tube. The resulting clear solution was evaporated under reduced pressure and the solid triturated with ether. The solid product was collected by vacuum filtration, washed with additional ether and dried in vacuo at 40°C for 1.5 hours.
  • Solid lithium borohydride (0.093 g, 4.3 mmoi, 3 eq.) was added in one portion to a solution of the ester (S) (1.05 g, 42 mmoi, 1 eq.) in dry THF ( 0 mL) under a nitrogen atmosphere at 0°C (ice bath). The reaction mixture was allowed to stir at 0°C for 30 minutes and then allowed to warm to room temperature at which point precipitation of an orange gum was observed. The reaction mixture was allowed to stir at room temperature for a further 2 hours and then cooled in an ice bath and treated with water (20 mL) to give a yellow suspension. Hydrochloric acid (1iVl) was carefully added (vigorous effervescence! until effervescence ceased. The reaction mixture was extracted with ethyiacetate (4 x 50 mL) and the combined organic layers were washed with water (100 mL), brine (100 ml) and dried ( gS0 4 ).
  • Triethylamine (0.25 g, 0.34 ml, 2.42 mmoi, 2.2 eq.) was added to a stirred solution of the mono-Boc protected b/s-aniline (9) (1.05 g, 1.1 mmoi, 1.0 eq.) and triphosgene (0.1 17 g, 0.4 mmo!, 0.36 eq.) in dry THF (10 mL) under an argon atmosphere at room temperature. The reaction mixture was heated to 40 e C and after 5 minutes a sample was treated with methanol and analysed by LCMS as the methyl carbamate.
  • Acetic act ⁇ J/H 2 0 (3/1 , 16 mL) was added to a solution, of the bis-sWy] ether (19) (0.72 g, 0.61 mmol, 1 eq.) in THF (4 mL). The resultant solution was stirred at room temperature for 16 hours. The pH of the reaction mixture was adjusted to pH8 with saturated sodium bicarbonate solution. The mixture was extracted with ethylaeetate (4 x 150 mL) and the combined extracts were washed with saturated sodium bicarbonate solution (2 x 150 mL), water (150 mL), brine (150 mL), dried (3 ⁇ 41gS0 4 ) and evaporated under reduced pressure.
  • reaction mixture was di!uted with DCM (50 ml) and extracted with 1M citric acid solution (3 x 150 mL), saturated sodium bicarbonate soiution (150 mL), water (200 mL), brine (200 ml), dried ⁇ MgS0 ) and evaporated under reduced pressure to give a yellow foam.
  • K562 human chronic myeloid leukaemia ceils were maintained in RPIVS1 1640 medium; supplemented with 10% fetal calf serum and 2 mM giutamine at 37°C in a humidified atmosphere containing 5% CO a and were incubated with a specified dose of drug for 96 hours at 37X in the dark. The incubation was terminated by centrifugation (5 min, 300 g) and the cells were washed once with drug-free medium. Following the appropriate drug treatment, the ceils were transferred to 96-well microtiter plates (10 4 ceils per well, 8 wells per sample). Plates were then kept in the dark at 37 X In a humidified atmosphere containing 5% CO .
  • the assay is based on the ability of viable ceils to reduce a yellow soluble tetrazoiium salt, 3-(4,5-dfmethyithiazoi-2-yi)-2,5-diphenyi-2H-tetrazoltum bromide ( ⁇ ' ⁇ , Aidrich-Sigma), to an insoluble purpie formazan precipitate. Following incubation of the plates for 4 days (to allow control cells to increase in number by approximately 10 fold), 20 ⁇ of MIT solution (6 mg/mL in phosphate-buffered saline) was added to each welt and the plates further incubated for 5 hours.
  • MIT solution 6 mg/mL in phosphate-buffered saline
  • Methods 332:41-52) expressed in CHO cells were reduced with about a 20-40 fold excess of TCEP (tris(2-carboxyethyl)phosphine hydrochloride or DTT (diibiothreitoi) in 50 mM Ins pH 7.5 with 2 m EDTA for 3 hrs at 37°C or overnight at room temperature.
  • TCEP tris(2-carboxyethyl)phosphine hydrochloride or DTT (diibiothreitoi) in 50 mM Ins pH 7.5 with 2 m EDTA for 3 hrs at 37°C or overnight at room temperature.
  • the reduced ThioMab was diluted and loaded onto a HiTrap S column in 10 mM sodium acetate, pH 5, and eluted with PBS containing 0.3M sodium chloride.
  • the antibody was acidified by addition of 1/20* volume of 10% acetic acid, diluted with 10 mM succinate pH 5, loaded onto the column and then washed with 10 column volumes of succinate buffer.
  • the column was eluted with 50 mM Tris pH7.5, 2 mM EDTA.
  • the eluted reduced ThioMab was treated with 15 fold molar excess of DHAA
  • the deblocked, reoxidized, tnio-antibodies were reacted with 8-8 fold molar excess of the compounds above (14, 22 ⁇ (from a DMSO stock at a concentration of 20 mM) in 50 mM Tris, pH 8, until the reaction was complete (16-24 hours) as determined by LC-MS analysis of the reaction mixture.
  • the crude antibody-daig conjugates were then applied to a cation exchange column after dilution with 20 mM sodium succinate, pH 5.
  • the column was washed with at least 10 column volumes of 20 mM sodium succinate, pH 5, and the antibody was eiuted with PBS.
  • the antibody drug conjugates were formulated Into 20 mM His/acetate, pH 5, with 240 mM sucrose using gei nitration columns.
  • the antibody-drug conjugates were characterized by UV spectroscopy to determine protein concentration, analytical SEC (size-exclusion chromatography) for aggregation analysis and LC-MS before and after treatment with Lysine C endopeptidase.
  • Size exclusion chromatography was performed using a Shodex KW802.5 column in G.2M potassium phosphate pH 6.2 with 0.25 mM potassium chloride and 15% SPA at a flow rate of 0.75 ml/min. Aggregation state of the conjugate was determined by integration of eluted peak area absorbance at 280 nm.
  • LC-MS analysis was performed using an Agilent QTOF 6520 ESI instrument.
  • an antibody-drug conjugate generated using this chemistry was treated with 1 :500 w/w Endoproteinase Lys C (Promega) in Tns, pH 7.5, for 30 min at 37°C.
  • the resulting cleavage fragments were loaded onto a 1000A, 8 urn PLRP ⁇ S column heated to 80°C and eluted with a gradient of 30% B to 40% B in 5 minutes.
  • Mobile phase A was H3 ⁇ 40 with 0.0.5% TFA and mobile phase B was acetonitrile with 0.04% TFA.
  • the flow rate was 0.5ml/min.
  • Protein eiuiion was monitored by UV absorbance detection at 280nm prior to eiectrospray ionization and MS anaiysis. Chromatographic resoiuiion of the unconjugated Fc fragment, residua! unconjugated Fab and drugged Fab was usually achieved. The obtained m/z spectra were deconvoluted using Mass HunterTM software (Agilent Technologies) to calculate the mass of the antibody fragments.
  • Control wefis were prepared containing medium and without ceils.
  • ADC was added to the experimental wells and incubated for 3-5 days.
  • the plate was incubated at room temperature for 10 minutes to stabilize the luminescence signal.
  • Certain cells are seeded at 000-2000/well or 2000-3000/wellin a 96-well plate, 50 uL/well.
  • ADC are added in 50 ⁇ volumes to final concentration of 9000, 3000, 1000, 333, 111 , 37, 12.4, 4.1 , or 1.4 ng/mL, with "no ADC" control wells receiving medium alone.
  • Conditions are in duplicate or triplicate
  • 100 ,uL/weSf Ceil TiterGlo II is added (luciferase-based assay; proliferation measured by ATP levels) and ce!l counts are determined using a luminometer. Data are plotted as the mean of luminescence for each set of replicates, with standard deviation error bars.
  • the protocol is a modification of the CellTster Gio Luminescent Cei! Viability Assay (Promega):
  • ADC is serially diluted 1 :3 in media beginning at at working concentration 18 g/ml (this resuits in a final concentration of 9 pg/m!). 50 ⁇ of diluted ADC is added to the 50 ⁇ of ce!!s and media already in the well
  • Antibody-drug conjugates, trastuzumab-14 (110) and tfastuzumab-22 (101 ) were tested against SK-BR-3, KPL-4, and CF-7 (Levenson et ai (1997) Cancer Res. 57(15):3071-3078) cells to measure in vitro cell viability in five day studies.
  • the IC1 ⁇ 2 (pg/mL). value for 101 against SK-BR-3 was 22.12.
  • the IC S0 value for 110 against SK-BR-3 was 102.78. are SK- BR-3 ceils are HER2+ expressing, trastuzumab sensitive.
  • Both 101 and 110 were effectively inactive against WICF-7, which is a HER2 non-expressing human breast adenocarcinoma ceil line.
  • conjugates 101 and 110 demonstrate targetted cell killing potency. Tumor growth inhibition, in vivo efficacy in high expressing HER2 transgenic explant mice
  • mice suitable for transgenic experiments can be obtained from standard commercial sources such as Taconic (Germantown, N.Y.). Many strains are suitable, but FVB female mice are preferred because of their higher susceptibility to tumor formation. FVB males were used for mating and vasectornized CD.1 studs were used to stimulate pseudopregnancy. Vasectomized mice can be obtained from any commercial supplier. Founders were bred with either FVB mice or with 129/8L6 x FV8 p53 heterozygous mice. The mice with heterozygosity at p53 allele were used to potentially increase tumor formation. However, this has proven unnecessary. Therefore, some F1 tumors are of mixed strain. Founder tumors are FVB only. Six founders were obtained with some developing tumors without having litters.
  • Animals having tumors were treated wit a single or muiisple dose by !V injection of ADC. Tumor volume was assessed at various time points after injection.
  • transgenic mice were produced using a HER2 cDNA plasmid in which an upstream ATG was deleted in order to prevent initiation of translation at such upstream ATG codons, which would otherwise reduce the frequency of translation initiation from the downstream authentic initiation codon of HER2 (for example, see Child et a! ⁇ 19SS ⁇ J. Bio!. Che . 274: 24335-24341 ). Additionally, a chimeric irstron was added to the 5' end, which should also enhance the level of expression as reported earlier ⁇ Neuberger and Williams (1988) Nucleic Acids Res.
  • the chimeric tniron was derived from a Promega vector, Pci-neo mammalian expression vector (bp 890-1022).
  • the cDNA 3'-end is flanked by human growth hormone exons 4 and 5, and polyadeny!ation sequences.
  • FVB mice were used because this strain is more susceptible to tumor development.
  • the promoter from MTV-ITR was used to ensure tissue-specific HER2 expression in the mammary gland. Animals were fed the AIN 76A diet in order to increase susceptibility to tumor formation (Rao ef a/ (1997) Breast Cancer Res. and Treatment 45: 149-158),
  • the Fo5 model is a transgenic mouse model in which the human HER2 gene, under transcriptional regulation of the murine mammary tumor virus promoter ⁇ MMTV-HER2), is overexpressed in mammary epithelium. The overexpression causes spontaneous development of mammary tumors that overexpress the human HER2 receptor.
  • the mammary tumor of one of the founder animals ⁇ founder #5 [Fo5]) has been propagated in subsequent generations of FVB mice by serial transplantation of tumor fragments.
  • the iYiMTV ⁇ HER2 Fo5 transgenic mammary tumor was surgically transplanted into the No.
  • Figure 1 shows a piot of the in vivo mean tumor volume change over time in breast cancer- model MTV-HER2 Fo5 mammary allograft tumors inoculated into CRL nu/nu mice after single iv dosing on day 0 with: (1 ) Vehicle 20m Histidtne acetate, pH 5.5, 240m M sucrose, ⁇ 2 ⁇ XCD22-22 (103) at lOmg/kg, (3) trastuzumab-22 (101 ) at 1 mg/kg, (4) trastuzumab-22 (101) at 3mg/kg, and (5) trastuzumab-22 (101) at 10mg/kg.
  • the lines in the figure are indicated with the followin symbols:
  • Figure 2 shows a piot of the in vivo mean tumor volume change over time in breast cancer- model MMTV-HER2 Fo5 mammary allograft tumors inoculated into CRL nu/nu mice after single iv dosing on day 0 with: (1 ) Vehicie 20mM Histidine acetate, pH 5.5, 240m sucrose, (2) XCD22-14 (112) at 6mg/kg, (3) trastuzumab-14 (110) at I mg/kg, (4) trastuzumab-14 (110) at 3mg/kg, (5) trastuzumab-14 (110) at emg/kg, and (6) trastuzumab-22 (101 ) at 1 mg/kg.
  • the lines in the figure are indicated with the following symbols: Vehicle
  • Bzi benzyl where Bz!-OMe is methoxybenzyl and Bzl-Me is methyibenzene Cbz or Z benzyioxy-carbonyi,. where Z-Ci and Z-Br are chloro- and bromobenzyloxy carbonyi respectively

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Abstract

A conjugate of formula (A): the dotted lines indicate the optional presence of a double bond between C1 and C2 or C2 and C3; R2 is independently selected from H, OH, =0, =CH2, CN, R, OR, =CH-RD, =C(RD)2, 0-S02-R, C02R and COR, and optionally further selected from halo or dihalo; where RD is independently selected from R, C02R, COR, CHO, C02H, and halo; R6 and R9 are independently selected from H, R, OH, OR, SH, SR, NH2, NHR, NRR', NO2, Me3Sn and halo; R7is independently selected from H, R, OH, OR, SH, SR, NH2, NHR, NRR', N02, Me3Sn and halo; Y is selected from a single bond, and a group of formulae A1 or A2: where N shows where the group binds to the N10 of the PBD moiety; RL1 and RL2 are independently se!ected from H and methyl, or together with the carbon atom to which they are bound form a cyclopropylene group; CBA represents a cell binding agent; Q is independently selected from O, S and NH; R11 is either H, or R or, where Q is O, S03M, where M is a metal cation; R and R' are each independently selected from optionally substituted C1-12alkyl, C3-20 heterocyclyl and C5-20aryl groups, and optionally in relation to the group NRR', R and R' together with the nitrogen atom to which they are attached form an optionally substituted 4-, 5-; 6- or Z-metfibered heteracyciie ring; wherein R12 R16, R19 and R17 are as defined for R2, R6, R9 and R7 respectively: wherein R" is a C3-12alky!ene group, which chain may be interrupted by one or more heteroatoms, e.g. O, S, N(H}; NMe and/or aromatic rings, e.g. benzene or pyridine, which rings are optional y substituted; X and X' are independently selected from O, S and N(H).

Description

PYRROLOBENZODIAZEPINES AND CONJUGATES THEREOF
The present invention relates to pyrroiobenzodiazepines (PBDs), in particular
pyrroiobenzodiazepines having a labile N10 protecting group, in the form of a linker to a cell binding agent.
Background to the invention
Pyrroiobenzodiazepines
Some pyrro!obenzodiazepines (PBDs) have the ability to recognise and bond to specific sequences of DNA; the preferred sequence is PuGPu. The first PBD antitumour antibiotic, anthramycin, was discovered in 1965 (Leimgruber, ei a/., J. Am. Chem, $oc.t 87, 5793-5795 (1965): Leimgruber, et ai., J. Am. Chem, Soc, 87, 5791-5793 (1965)). Since then, a number of naturally occurring PBDs have been reported, and over 10 synthetic routes have been developed to a variety of analogues (Thurston, ei ai, Chem. Rev, 1994, 433-465 (1994); Antonow, D. and Thurston, D.E., Chem. Rev. 2011 11 (4), 2815-2884). Family members include abbeymycin (Hocniowski.. et a/., J. Antibiotics, 40, 145-148 (1987)}, c icamyein
(Konishi, ei a/., J. Antibiotics, 37, 200-206 ( 1984)}, 0C-81 (Japanese Patent 58-180 487; Thurston, et ai, Chem. Brit, 26, 767-772 (1990); Boss, et ai. , Tetrahedron, 48, 751-758 (1992)), mazetnramycin (Kuminoto, et a!., J. Antibiotics, 33, 665-667 ( 980)}, neot ramycins A and B (Takeuchi, ei ai., J. Antibiotics, 29, 93-96 (1978)), porothramycin (Tsuriakawa, ei ai,, J. Antibiotics, 41 , 1366- 373 (1988)), prothracarcin (Shimizu, et ai, J. Antibiotics, 29, 2492- 2503 (1982); lang!ey and Thurston, J. Org. Chem, , $2, 91-97 (1987)), sibanomicsn (DC- 102)(Hara, et ai., J. Antibiotics, 41, 702-704 (1988): Itoh, er a/., J. Antibiotics, 41 , 1281-1284 (1988)), sibiromycin (Leber, et ai., J. Am. Chem, Soc, 110, 2992-2993 ( 88)) and
iomamycin (Arima, ei ai,, J. Antibiotics, 25, 437-444 (1972)). PBDs are of the general structure:
Figure imgf000003_0001
They differ in the number, type and position of subsiituents, in both their aromatic A rings and pyrrolo C rings, and in the degree of saturation of the C ring, in the B-ring there is either an irnine (N~C), a carfosnoiamine{NH-CH(GH)), or a carbinolamine methyl ether (NH- CH(OMe)) at the N10-C11 position which is the electrophilic centre responsible for alkylating
DNA, Ai! of the known natural products have an ^-configuration at the cfsirai CI la position which provides them with a right-handed twist when viewed from the C ring towards the A ring. This gives them the appropriate three-dimensional shape for isoheiicity wit the minor groove of 8-forrn DNA, leading to a snug fit at the binding site (Ko n, in Antibiotics Hi.
Springer- Verfag, New York, pp. 3-11 (1975); Hurley and Need am-VanDevanter, Acc, Cftem, Res., 19, 230-237 (1986)}. Their ability to form an adduct in the minor groove, enables them to interfere with DNA processing, hence their use as antitumour agents.
The present inventors have previously disclosed in WO 2005/085251 , dimeric PBD comp
Figure imgf000004_0001
These compounds have been shown to be highly useful cytotoxic agents.
A particularly advantageous pyrro!obenzodiazepine compound is described by Gregson et ai. {Chem. Common, 1999, 797-798) as compound 1, and by Gregson et a/. (J Med. C em. 2001 , 44, 1161- 174) as compound 4a. This compound, also known as SJG-136, is shown below:
Figure imgf000004_0002
The present inventors have previously disclosed that PBD compounds can be employed as prodrugs by protecting them at the N10 position with a nitrogen protecting group which is removable in vivo (WO 00/12507). Many of these protecting groups are carbamates, and are, for example, of the structure:
Figure imgf000005_0001
where the asterisk {*) indicates the attachment point to the N10 atom of the PBD.
The present inventors have a!so described the preparation of PBD compounds having a nitrogen carbamate protecting group at the N10 position (WO 2005/023814). The protecting groups are removable from the N10 position of the PBD moiety to leave an N10-GT1 imine bond. A range of protecting groups is described, including groups that can be cleaved by the action of enzymes. WO 2007/085930 describes the preparation of dimer PBD compounds having linker groups for connection to a cell binding agent, such as an antibody. The linker is present in the bridge linking the monomer PBD units of the dimer.
Antibody-drug conjugates
Antibody therapy has been established for the targeted treatment of patients with cancer, immunological and angiogenic disorders (Carter, P. (2006) Nature Reviews immunology 6:343-357), The use of antibody-drug conjugates (ADC), i.e. immunoconjugates, for the ioca! delivery of cytotoxic or cytostatic agents, i.e. drugs to kill or inhibit tumor cells in the treatment of cancer, targets delivery of the drug moiety to tumors, and intracellular accumulation therein, whereas systemic administration of these unconjugated drug agents may result in unacceptable levels of toxicity to normal cells as well as the tumor cells sought to be eliminated (Xie et al (2006) Expert. Opin. Biol. Ther. 6(3):281-291 ; Kovtun et al (2006) Cancer Res, 66{8);3214-3121 : Law et al (2006) Cancer Res. 66(4}:2328-2337; Wu et el (2005) Nature Biotech, 23(9): 1.137-1145; Lambert J. (2005) Current Opin. in Pharmacol 5:543-549; Hamann P. (2005) Expert Opin. Ther. Patents 15(9): 1087-1103; Payne, G.
(2003) Cancer Cell 3:207-212; Trail 'ef at (2003) Cancer Immunol. Immunother. 52:328-337; Syrigos and Epenetos (1999) Anticancer Research 19:605-614).
Maximal efficacy with minimal toxicity is sought thereby. Efforts to design and refine ADC have focused on the seiectivity of monoclonal antibodies (mAbs) as well as drug mechanism of action, drug-linking, drug/antibody ratio (loading), and drug-releasing properties (Junuluia, et a/,, 2008b Nature Biotech. , 26(8):925~932; Doman et al (2009) Blood 114(13):2721 -2729; US 7521 41; US 7723485; VVO2009/052249; McDonagh (2006) Protein Eng. Design & Se!. 19(7): 299-307; Doronina et al (2006) Bioconj. Chem. 17:1 14-124; Erickson et al (2006)
Cancer Res. 66(8); 1-8: Sanderson et al (2005) Clm. Cancer Res. 11 :843-852; Jeffrey ef a/ (2005) J. Med. Chem, 48:1344-1358; Hamb!ett et a! (2004) Clin, Cancer Res. 10:7083- 7070). Drug moieties may impart their cytotoxic and cytostatic effects by mechanisms including tubulin binding, DNA binding, or topoisomerase inhibition. Some cytotoxic drugs tend to be inactive or less active when conjugated to large antibodies or protein receptor ligands.
The present inventors have developed a novel approach to forming PBD conjugates with cell binding agents, and in particular PBD antibody conjugates.
Summary of the invention
in a genera! aspect the present invention provides a conjugate comprising a PBD dimer compound connected through the N10 position via a specific sulfur linker to a cell binding agent The cell binding agent is preferably an antibody.
In a first aspect, the present invention provides novei conjugate compounds of formuia (A);
Figure imgf000006_0001
and salts and solvates thereof, wherein:
the dotted lines indicate the optional presence of a double bond between C1 and C2 or C2 and C3;
Rz is independently selected from H, OH, =0, =CH2, CN, R, OR, =CH-RD, =C(RD)2, 0-SGLJ~R, CO2 and COR, and optionally further selected from halo or dihalo;
where RD is independently selected from R, C02R, COR, CHO, C02H, and halo; R6 and R9 are independently selected from H, R, OH, OR, SH, SR, NH2, NHR, NRR',
N02, Messrs and haio;
R? is independently seiected from H, R, OH, OR, SH, SR, NH2, NHR, NRR', N02, Me3Sn and haio;
Y is selected from a single bond, and a group of formulae A1 or A2:
Figure imgf000007_0001
where N shows where the group binds to the N10 of the PBD moiety;
R ■ and RL2 are independently seiected from H and methyl, or together with the carbon atom to which they are bound form a cyclopropylene group;
CBA represents a cell binding agent:
Q is independently selected from O, S and NH;
R is either H, or R or, where Q is O, S03M, where M is a metai cation;
R and R! are each independently selected from optionally substituted G-MS aiky!, C3..20 heterocyc!y and C&.¾> aryj groups, and optionally in relation to the group NRR', R and R' together with the nitrogen atom to which they are attached form an optfonali substituted 4-, 5-, 6- or 7-membered heterocyclic ring;
wherein ¾, R1¾\ R13 and ? are as defined for Ra, *\ R3 and R7 respectively;
wherein R" is a C^2 alky!ene group, which chain may be interrupted by one or more heteroatoms, e.g, O,. S, M(H), N e and/or aromatic rings, e.g. benzene or pyridine, which rings are optionally substituted;
X and X! are independentl selected from O, S and N{H).
Thus formula A is selected from the following formulae A-l, A-ll and A-lil, depending on Y:
Figure imgf000008_0001
In compounds of formula A:
Figure imgf000009_0001
is the sulfur linking group.
A second aspect of the present invention pertains to the use of a conjugate of the first aspect to provide a com
Figure imgf000009_0002
C
and salts and solvates thereof, wherein the groups are as for the first aspect, except that
Q is independently selected from O, S and NH; and
R11 is either Hs or R or, where Q is O, S03M, where M is a metal cation.
A third aspect of the pfesen invention aiso provides compounds of formula (D) for use in the preparation of the conjugate compounds of the invention:
Figure imgf000010_0001
In the compounds above, the 5-membered rings represented by
Figure imgf000010_0002
Figure imgf000010_0003
, may be replaced by a ring selected from:
(a)
Figure imgf000010_0004
(E), where R2 with either of R1 or R3, together with the carbon atoms of the C ring to which they are attached, fonts an optionally substituted benzene ring;
V and W are each selected from {CH2}„, O, S, NR, CHR, and CRR* where n is 2 or 3, except that V is C when R and Ra t together with the carbon atoms of the C ring to which they are attached, form an optionally substituted benzene ring, and W is C when R3 and R2, together with the carbon atoms of the C ring to which they are attached, form an optionally substituted benzene ring; and
I X
(fo) T (F), where T is selected from CH2, NR, CO, BH, SO, and S02;
U is selected from OH..., NR, O and S; Y is (CH2)n, where n is 1 , 2, 3 or 4;
except that T, U and Y are not aii CH2.
Detailed Description of the Invention
The present invention provides a conjugate comprising a PBD dimer connected through the N10 position on one of the PBD moieties via the specified linker to a cell binding agent.
The present invention is suitable for use in providing a PBD compound to a preferred site in a subject. The conjugate allows the release of an active PBD compound that does not retain any part of the linker. There is no stub present that could affect the reactivity of the PBD compound.
Preferences
The following preferences may apply to all aspects of the invention as described above, or may relate to a single aspect. The preferences may be combined together in any combination.
Double Bond
In one embodiment, there is no double bond present between C1 and C2, and C2 and C3.
In one embodiment, the dotted lines indicate the optional presence of a double bond between C2 and C3, as shown below:
Figure imgf000011_0001
In one embodiment, a double bond is present between C2 and C3 when R2 is Cf ¾ aryl C{. Λ2 a!ky!.
in one embodiment, the dotted Sines indicate the optional presence of a double bond between C1 and C2, as shown below:
Figure imgf000011_0002
In one embodiment, a double bond is present between C1 and C2 when R2 is C5.20 aryl or C-i-12 alkyl.
R2
In one embodiment, R2 is independently selected from H, OH, =0, =CH2, CN, R, OR, =CH- RD, =C(RD)2, 0-S02-R, C02R and COR, and optionally further selected from halo or dihalo. In one embodiment, R2 is independently selected from H, OH, =0, =CH2, CN, R, OR, =CH- RD, =C(RD)2, O-SO2-R, C02R and COR.
In one embodiment, R2 is independently selected from H, =0, =CH2, R, =CH-RD, and =C(RD)2.
In one embodiment, R2 is independently H.
In one embodiment, R2 is independently =0.
in one embodiment, R2 is independently =CH2.
in one embodirrieni, R2 is independently =CH-R°, Within the PBD compound, the group =CH~R° may have either confi uration shown below:
Figure imgf000012_0001
(I) (»)
In one embodiment, the configuration is configuration (I). In one embodiment, R2 is independently =C(RD}3.
In one embodiment, R2 is independently =CF2.
In one embodiment, R2 is independently R.
In one embodiment, R2 is independently optionally substituted C5-20 aryl.
In one embodiment, R2 is independently optionally substituted Ci-12 alkyl.
In one embodiment, R2 is independently optionally substituted C5.20 aryl.
In one embodiment, R2 is independently optionally substituted C5_7 aryl.
In one embodiment, R2 is independently optionally substituted C8-io aryl.
In one embodiment, R2 is independently optionally substituted phenyl.
In one embodiment, R2 is independently optionally substituted thienyl. In one embodiment, R2 is independently optionally substituted napthyl.
In one embodiment, R2 is independently optionally substituted pyridyl.
In one embodiment, R2 is independently optionally substituted quinolinyl or isoquinolinyl.
In one embodiment, R2 bears one to three substituent groups, with 1 and 2 being more preferred, and singly substituted groups being most preferred. The substituents may be any position. Where Ra is a C->7 aryi group, a single substituent is preferably on a ring atom that is not adjacent the bond to the remainder of the compound, i.e. it is preferably β or y to the bond to the remainder of the compound. Therefore, where the Cs.7 aryi group is phenyl, th substituent is preferably in the meta- or para- positions, and more preferably is in the para- position.
In one embodiment, R2 is selected from:
Figure imgf000013_0001
where the asterisk indicates the point of attachment. Where R7 is a C8 !0 aryi group, for example quinolinyl or isoquinolinyl, it may bear any number of substituents at any position of the quinoline or isoquinoline rings. In some embodiments, it bears one, two or three substiituents, and these may be on either the proximal and distal rings or both (if more than one substituent). in one embodiment, where R2 is optionally substituted, the substituents are selected from those substituents given in the substituent section below.
Where R is optionaiiy substituted, the substituents are preferably selected from:
Halo, Hydroxy!, Ether, Formyi, Acyi, Carboxy, Ester, Acyloxy, Amino, Amido, Acyiamido, Arninocarbonyloxy, Ureido, Nitro, Cyano and Thioether.
In one embodiment, where R or R2 is optionally substituted, the substituents are selected from the group consisting of R, OR, SR, NRR', N02, halo, C02R, COR, CONH2, CONHR, and CONRR'. Where R2 is C-;.:? alkyi. the optional substituent may additionally include C3_20 heterocyclyl and C5.20 aryl groups.
Where Ra is C3.?o heferocyciyi, the optional substituent may additionally include CM2 alkyl and <¾;¾: aryl groups.
Where R2 is 0; .;¾ aryl groups, the optional substituent may additionally include
C¾aj heterocyciyi and Cv¾ alkyi groups. it is understood that the term "alkyi" encompasses the sub-classes alkenyl and alkynyl as well as cycloalky!. Thus, where Rz is optionally substituted C1-12 alkyl, it is understood that the alkyl group optionally contains one or more carbon-carbon double or triple bonds, which may form par of a conjugated system, in one embodiment, the optionally substituted C 5. 2 alkyl group contains at !east one carbon-carbon double or triple bond, and this bond is conjugated with a double bond present between C1 and C2, or C2 and C3, in on embodiment, the C,..^ aikyi group is a group selected from saturated C1-12 alkyl, C2-i2 alkenyl, Qj.12 alkynyl and C n cycioalkyi.
If a substituent on R2 is halo, it is preferably F or CI, more preferably F. if a substitueni on R2 is ether, it may in some embodiments be an alkoxy group, for example, a C-.;< alkoxy group (e.g. methoxy, ethoxy) or it may in some embodiments be a aryloxy group fe.g phenoxy, pyrid loxy, furanyloxy).
If a substituent on R2 is C-|.7 alkyl, it may preferably be a C1-4 alkyl group (e.g. methyl, ethyl, propyl, butyl). if a substituent on Ra is C3.7 heterocyclyl, it may in some embodiments be Cs nitrogen containing heterocyclyl group, e.g. morpholino, thiornorpholsno, piperidinyl, piperazinyl.
These groups may be bound to the rest of the PSD moiety via the nitrogen atom. These groups may be further substituted, for example, by C-M alkyi groups. ff a substituent on R2 is bis-oxy-C -3 alkyiene, this is preferably bis-oxy-methytene o bts-oxy- ethylene.
Particularly preferred substituents for R2 include methoxy, ethoxy, fluoro, chloro, cyano, bis- oxy-methylene, metrryi-piperazinyS, morpholino and methyl-thienyl. Particularly preferred substituted R2 groups include, but are not limited to, 4-methoxy-phenyl, 3-methoxyphenyl, 4-ethoxy-phenyl, 3-ethoxy-phenyl, 4-methyl-phenyl, 4-fluoro-phenyl, 4- chloro-phenyl, 3,4-bisoxymethylene-phenyl, 4-methylthienyl, 4-cyanophenyl, 4- phenoxyphenyl, quinolin-3-yl and quinolin-6-yl, isoquinolin-3-yl and isoquinolin-6-yl, 2-thienyl, 2-furanyl, methoxynaphthyl, and naphthyl.
In one embodiment, R2 is halo or dihalo. In one embodiment, R2 is -F or -F2, which substituents are illustrated below as III) and (IV) respectively:
Figure imgf000015_0001
(III) (IV)
In some embodiments, it is preferred that there is either a double bond between C2 and C3 or the C2 substituent is bound to the PBD ring by a double bond (i.e. that the C atom at C2 is a sp2 centre) RD
In one embodiment, RD is independently selected from R, C02R, COR, CHO, C02H, and halo.
In one embodiment, RD is independently R.
In one embodiment, RD is independently halo.
R
in one embodiment, R6 is independently selected from H, R, OH, OR, SH, SR, NH2, NHR, NRR\ O£, Me3Sn- and Halo. In one embodiment, R6 is independently selected from H, OH, OR, SH, NH2, N02 and Halo. In one embodiment, R6 is independently selected from H and Halo.
In one embodiment, R6 is independently H.
In one embodiment, R6 and R7 together form a group -0-(CH2)p-0-, where p is 1 or 2.
R7 R7 is independently selected from H, R, OH, OR, SH, SR, NH2, NHR, NRR', N02, Me3Sn and halo.
In one embodiment, R7 is independently OR.
In one embodiment, R7 is independently OR7A, where R7A is independently optionally substituted Ci.e aikyi.
In one embodiment, R'A is independently optionally substituted saturated C -6 alkyl.
In one embodiment, R7A is independently optionally substituted C2-4 alkenyl.
In one embodiment, R7A is independently Me.
In one embodiment, R7A is independently CH2Ph.
In one embodiment, R7A is independently allyl.
R9
In one embodiment, R9 is independently selected from H, R, OH, OR, SH, SR, NH2, NHR, NRR\ N02, e3Sn- and Halo. in one embodiment, R9 is independently H.
In one embodiment, R9 is independently R or OR.
Unking group
The linking group is removable from the N10 position of the PBD moiety in the conjugate of formula A to leave an N10-C1 1 imine bond, a carbinoiamine, a substituted carbinoiamine, where Q 11 is QSOM, a bisulfite adduct, a tnjocarbinolamine, a substituted
thiocarbino amine, or a substituted caroina!amine (compound of formulae B or C) as illustrated below:
Figure imgf000016_0001
thiocarbinolamine substitued thiocarbinoiamine substitued carbinalamine where R and M are as defined for the conjugates of the invention. in one embodiment, the Jinking group is removable from the N10 position of the PBD moiety to leave an 10-C11 imine bond.
The specified link between the PBD dimer and the cell binding agent, e.g. antibody, in the present invention is preferably stab!e extracellulariy. Before transport or deliver/ into a ceil, the antibody-drug conjugate (ADC) is preferably stable and remains intact, i.e. the antibody remains Sinked to the drug moiety. The linkers are stabie outside the target celi and may be cleaved at some efficacious rate inside the cell. An effective linker will: (i) maintain the specific binding properties of the antibody; (ii) ai!ow intraceiiuiar delivery of the conjugate or drug moiety; (iii) remain stable and intact, i.e. not cleaved, until the conjugate has been delivered or transported to its targetted site; and (iv) maintain a cytoioxic, ce!!-kiiiing effect or a cytostatic effect of the PBD drug moiety . Stability of the ADC may be measured by standard analytical techniques such as mass spectroscopy, HPLC, and the
separaiion/anaSysis technique LC/MS.
Delivery of the compounds of formulae B or C is achieved at the desited activation site of the conjugates of formula A by the action of an enzyme on the linking group. The S of the conjugate of formula A is linked by a disulfide bond to a free S (active thiol) on the cell binding agent.
The linking group may be cleavable by the action of an enzyme. In one embodiment, the enzyme is a thioreductase.
Certain antibodies have reducible interchain disulfides, i.e. cysteine bridges. Antibodies may be mad reactive for conjugation with linker reagents by treatment with a reducing agent such as DTT (diihiothrestoi). Each cysteine bridge will thus form, theoreticaify, two reactive thiol nucieophiies. Additional nucleophiiic groups can be introduced into antibodies through the reaction of lysines with 2-iminothiolane (Traut's reagent) resulting in conversion of an amine into a thiol. Reactive thiol groups may be introduced into the antibody (or fragment thereof} by introducing one, two, three, four, or more cysteine residues (e.g., preparing mutant antibodies comprising one or more non-native cysteine amino acid residues). US 7521541 teaches engineering antibodies by introduction of reactive cysteine amino acids. RL1 and RL2 are selected from H and methyl, or together with the carbon atom to which they are bound form a cyclopropylene group. In some embodiments, both are H. In other embodiment, both are methyl. In further embodiments, one is H and the other is methyl; in these embodiments, the carbon atom to which they are bound is a chiral centre.
In some embodiments, Y is a single bond.
In other embodiments, Y is
Figure imgf000018_0001
In further embodiments, Y is
Q
In one embodiment, Q is selected from O, S, or N(H).
Preferably, Q is O.
Rn
In one embodiment, Rn is either H, or R or, where Q is O, S03M, where M is a metal cation. in one embodiment, R is H.
in one embodiment ! ' is R.
!n one embodiment, where Q is O, Rn is SO3 , where M is a metal cation. The cation may be Na .
Cell Binding Agent
A cell binding agent may be of an kind, and include peptides and non-peptides. These can include antibodies or a fragment of an antibody that contains at least one binding site, iymphokines, hormones, growth factors, nutrient-transport molecules, or any other cell binding molecule or substance.
The term "antibody" herein is used in the broadest sense and specifically covers monoclonal antibodies, polyclonal antibodies, dimers, multimers, multispecific antibodies {e.g., bispecifie antibodies), and antibody fragments, so long as they exhibit the desired biological activity (Miller ei al {2003} Jou of Immunology 170:4854-4861 ). Antibodies may be murine, human, humanized, chimeric, or derived from other species. An antibody is a protein generated by the immune system that is capable of recognizing and binding to a specific antigen.
(Jarteway, C, Travers, P., Waiporf, M., Shiornchik (2001) immuno Biology, 5th Ed., Garland Publishing, New York). A target antigen generally has numerous binding sites, also cai!ed epitopes, recognized by CD s on multiple antibodies. Each antibody that specificai!y binds to a different epitope has a different structure. Thus, one antigen may have more than one corresponding antibody. An antibody includes a full-length immunoglobulin molecule or an immunologically active portion of a fui!-!ength immunoglobulin molecule, i.e., a molecule that contains an antigen binding site that immunospecifically binds an antigen of a target of interest or part thereof, such targets including but not limited to, cancer cell or ceils that produce autoimmune antibodies associated with an autoimmune disease. The
immunoglobulin can be of any type (e.g. IgG, igE, Ig . IgO, and igA), class (e.g. SgGI , igG2, igG3, igG4, igA1 and !gA2) or subclass of immunoglobulin molecule. The immunoglobulins can be derived from any species, including human, murine, or rabbit origin.
"Antibody fragments" comprise a portion of a full length antibody, generally the antigen binding or variable region thereof. Examples of antibody fragments include Fab, Fab', F(ab¾, and Fv fragments; diabodies; linear antibodies; fragments produced by a Fab expression library, antHdiotypic (anti-id) antibodies, CDR (complementary determining region), and epitope-binding fragments of any of the above which immunospecificaify bind to cancer cell antigens, viral antigens or microbial antigens, single-chain antibody molecules; and multispecific antibodies formed from antibody fragments. The term "monoclonal antibody" as used herein refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e. the individual antibodies comprising the population are identical except for possible naturally occurring mutations that may be present in minor amounts, Monoclonal antibodies are highly specific, being directed against a single antigenic site. Furthermore, in contrast to polyclonal antibody preparations which include different antibodies directed against different determinants (epitopes), each monoclonal antibody is directed against a single determinant on the antigen. In addition to their specificity, the monoclonal antibodies are advantageous in that they may be
synthesized uncontaminated by other antibodies. The modifier "monoclonal" indicates the character of the antibody as being obtained from a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method. Fo example, the monoclonal antibodies to be used in accordance with the present invention may be made by the hybridoma method first described by Kohler ef a/ {1975} Nature 256:495, or may be made by recombinant DNA methods {see, US 4818567). The monoclonal antibodies may aiso be isolated from phage antibody libraries using the techniques described in Clackson et a! {1991} Nature, 352:824-828; Marks et a! (1991 ) J. Mol. Biol., 222:581-597.
The monoclonal antibodies herein specifically include "chimeric" antibodies in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain(s) is identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of such antibodies, so long as they exhibit the desired biological activity (US 4816587; and Morrison f a/ (1984) Proc, Natl. Acad. Sci, USA, 81 :6851-6855). Chimeric antibodies include "primatized" antibodies comprising variable domain antigen-binding sequences derived from a non- human primate (e.g. Old Worid Monkey or Ape) and human constant region sequences.
An "intact antibody" herein is one comprising a VL and VH domains, as well as a light chain constant domain (CL) and heavy chain constant domains, CH1 , CH2 and CH3. The constant domains may be native sequence constant domains (e.g. human native sequence constant domains) or amino acid sequence variant thereof. The intact antibody may have one or more "effector functions" which refer to those biological activities attributable to the Fc region (a native sequence Fc region or amino acid sequence variant Fc region) of an antibody. Examples of antibody effector functions include C1q binding; complement dependent cytotoxicity; Fc receptor binding; antibody-dependent cell-mediated cytotoxicity (ADCC); phagocytosis; and down regulation of cell surface receptors such as B cell receptor and BCR.
Depending on the amino acid sequence of the constant domain of their heavy chains, intact antibodies can be assigned to different "classes." There are five major classes of intact antibodies: IgA, IgD, IgE, IgG, and IgM, and several of these may be further divided into "subclasses'* (isotypes), e.g., lgG1 , igG2, IgGS, !gG4, fgA, and lgA2. The heavy-chain constant domains that correspond to the different classes of antibodies are called α, δ, ε, γ, and μ, respectively. The subunit structures and three-dimensional configurations of different classes of immunoglobulins are well known. Examples of cell binding agents include those agents described for use in WO 2007/085930, which is incorporated herein.
The cell binding agent may be, or comprise, a polypeptide. The polypeptide may be a cyclic polypeptide. The cell binding agent may be antibody. Thus, in one embodiment, the present invention provides an antibody-drug conjugate (ADC).
Drug loading
The drug loading is the average number of PBD drugs per antibody. Drug loading may range from 1 to 8 drugs (D) per antibody (Ab), i.e. where 1 , 2, 3, 4, 5, 6, 7, and 8 drug moieties are coyalently attached to the antibody. Compositions of ADC tnciude coiiections of antibodies conjugated with a range of drugs, from 1 to S. The average number of drugs per antibody in preparations of ADC from conjugation reactions may be characterized by conventional means such as mass spectroscopy, ELISA assay, electrophoresis, and HPLC. The quantitative distribution of ADC in terms of p may also be determined. By ELISA, the averaged value of p in a particular preparation of ADC may be determined (Hamblett et al (2004) Clin. Cancer Res, 10:7083-7070; Sanderson et ai (2005) C!in. Cancer Res. 11 :843- 852). However, the distribution of (drug) values is noi discernible by the antibody-antigen binding and detection limitation of ELISA. Also, ELISA assay for detection of antibody-drug conjugates does not determine where the drug moieties are attached to the antibody, such as tiie heavy chain or light chain fragments, or the particular amino acid residues. In some instances, separation, purification, and characterization of homogeneous ADC where p is a certain value from ADC with other drug loadings may be achieved by means such as reverse phase HPLC or electrophoresis.
For some antibody-drug conjugates, p may be limited by the number of attachment sites on the antibody. For example, an antibody may have only one or several cysteine thiol groups, or may have oniy one or several sufficiently reactive thiol groups through which a iinker may be attached. Higher drug loading, e.g. p >5, may cause aggregation, insolubility, toxicity, or loss of cellular permeability of certain antibody-drug conjugates.
Typically, fewer than the theoretical maximum of drug moieties are conjugated to an antibod during a conjugation reaction. An antibody may contain, for example, many lysine residues that do not react with the drug-linker intermediate (D-L) or iinker reagent. Only the most reactive lysine groups may react with an amine-reactive linker reagent. Also, only the most reactive cysteine thiol groups may react with a thio!-reactive iinker reagent. Generally, antibodies do not contain many, if any, free and reactive cysteine thiol groups which may be linked to a drug moiety. Most cysteine thiol residues in the antibodies of the compounds exist as disulfide bridges and must be reduced with a reducing agent such as dithiothreitol (DT I) or TCEP, under partial or total reducing conditions. The loading (drug/antibody ratio) of an ADC may be controlled in several different manners, including: (i) limiting the molar excess of drug-linker intermediate (D-L) or linker reagent relative to antibody, (ii) limiting the conjugation reaction time or temperature, and (iii) partial or limiting reductive conditions for cysteine thiol modification. Cysteine amino acids may be engineered at reactive sites in an antibody and which do not form intrachain or intermolecular disulfide linkages (Junutuia, et al., 2008b Nature Biotech 26{8);925-932; Dornan et al (2009) Blood 114( 13 }:2721-27:29; US 7521541 ; US 7723485; O2009/052249, Shen et al (2012) Nature Biotech., 30(2}:184-191 ; Junutuia et al (2008) Jour of immun. Methods 332.41-52). The engineered cysteine thiols may react with linker reagents or the drug-linker reagents of the present invention which have thiol-reactive, e!eetrophif!G groups sucn as maleimide or alpha-halo amides to form ADC with cysteine engineered antibodies (ThioMabs) and the PBD drug moieties. The location of the drug moiety can thus be designed, controlled, and known. The drug loading can be controlled since the engineered cysteine thiol groups typically react with thiol-reactive linker reagents or drug-linker reagents in high yield. Engineering an IgG antibody to introduce a cysteine amino acid by substitution at a single site on the heavy or light chain gives two new cysteines on the symmetrical antibody. A drug loading near 2 can be achieved and near homogeneity of the conjugation product ADC. Where more than one nucleophilic or electrophilic group of the antibody reacts with a drug- linker intermediate, or linker reagent followed by drug moiety reagent, then the resulting product is a mixture of ADC compounds with a distribution of drug moieties attached to an antibody, e.g. 1 , 2, 3, etc. Liquid chromatography methods such as polymeric reverse phase (PLRP) and hydrophobic interaction (HIC) may separate compounds in the mixture by drug loading value. Preparations of ADC with a single drug loading value (p) may be isolated, however, these single loading value ADCs may still be heterogeneous mixtures because the drug moieties may be attached, via the linker, at different sites on the antibody.
Thus the antibody-drug conjugate compositions of the invention include mixtures of antibody-drug conjugate compounds where the antibody has one or more PBD drug moieties and where the drug moieties may be attached to the antibody at various amino acid residues.
In one embodiment, the average number of dimer pyrrolobenzodiazepine groups per cell binding agent is in the range 1 to 20. In some embodiments the range is selected from 1 to 8, 2 to 8, 2 to 6, 2 to 4, and 4 to 8.
In some embodiments, there is one dimer pyrrolobenzodiazepine groups per cell binding agent.
Peptides
!n one embodiment, the eel! binding agent is a linear or cyclic peptide comprising 4-20, preferably 6-20, contiguous amino add residues. In this embodiment, it is preferred that one cell binding agent is linked to one monomer or dimer pyrroiobenzodiazeptne compound.
In one embodiment the cell binding agent comprises a peptide that binds integrin avps. The peptide may be selective for ανβ« over XYS. in one embodiment the eel! binding agent comprises the A20FMDV-Cys polypeptide. The A2QFMDV-Cys has the sequence: NAVPNLRGDLQVLAGKVARTC, Alternatively, a variant of the A20FMDV-Cys sequence may be used wherein one, two, three, four, five, six, seven, eight, nine or ten amino acid residues is substituted with another amino acid residue.
In one embodiment the antibody is a monoclonal antibody; chimeric antibody; humanized antibody; fully human antibody; or a single chain antibody. One embodiment the antibody is a fragment of one of these antibodies having biological activity. Examples of such fragments include Fab, Fab', F(ab')2 and Fv fragments.
In these embodiments, each antibody may be linked to one or several dimer
pyrrolobenzodiazepine groups. The preferred ratios of pyrrolobenzodiazepine to cell binding agent are given above.
The antibody may be a domain antibody (DAB). In one embodiment, the antibody is a monoclonal antibody. Antibodies for use in the present invention include those antibodies described in WO
2005/082023 which is incorporated herein. Particularly preferred are those antibodies for tumour-associated antigens. Examples of those antigens known in the art include, but are not limited to, those tumour-associated antigens set out in WO 2005/082023. See, for instance, pages 41-55.
The conjugates of the invention are designed to target tumour cells via their cell surface antigens. The antigens are usually normal cell surface antigens which are either over- expressed or expressed at abnormal times. Ideally the target antigen is expressed only on proliferative cells (preferably tumour cells), however this is rarely observed in practice. As a result, target antigens are usually selected on the basis of differential expression between proliferative and healthy tissue.
Antibodies have been raised to target specific tumour related antigens including:
Cripto, CD30, CD19, CD33, Glycoprotein HUB, CanAg, Her2 (£rbB2 Neu), CD56
(!MCAivl), CD22 (Siglec2), CD33 (SigiecS), CD79, CD138, PSCA, PS!vlA (prostate specific membrane antigen), BCMA, CD20, CD70, E-selectin, EphB2, Melanotransferin, Mud 6 and TMEFF2. Tumor-associated antigens (TAA) are known in the art, and can prepared for use in generating antibodies using methods and information which are well known in the art. In attempts to discover effective ce!Suiar targets for cancer diagnosis and therapy, researchers have sought to identify transmembrane or otherwise tumor-associated polypeptides that are specifically expressed on the surface of one or more particular type(s) of cancer cell as compared to on one or more normal non-cancerous cell(s). Often, such tumor-associated po!ypeptides are more abundantly expressed on the surface of the cancer cells as compared to on the surface of the non-cancerous ceils. The identification of such tumor-associated cell surface antigen poiypeptides has given rise to the ability to specifically target cancer cells for destruction via antibody-based therapies.
Examples of TAA include, but are not limited to, TAA (1)-(36) listed below. For convenience, information relating to these antigens, ail of which are known in the art, i listed below and includes names, alternative names, Genbank accession numbers and primary reference(s), following nucleic acid and protein sequence identification conventions of the National Center for Biotechnology Information (NCBl), Nucleic acid and protein sequences corresponding to TAA (1)-(36) are available in public databases such as GenBank. Tumor-associated antigens targeted by antibodies include all amino acid sequence variants and isoforms possessing at least about 70%, 80%, 85% : 90%, or 95% sequence identity relative to th sequences identified in th cited references, or which exhibit substantially the same biological properties or characteristics as a TAA having a sequence found in the cited references. For example, a TAA having a variant sequence generally is able to bind specifically to an antibody that binds specifically to the TAA with the corresponding sequence listed. The sequences and disclosure in the reference specifically recited herein are expressly incorporated by reference. TUMOR-ASSOCIATED ANTIGENS (1 )-(36):
(1) SSvlP IB (bone morphogenetic protein receptor-type IB, Genbank accession no NM_001203) ten Dijke ., et a! Science 264 {S155):101-104 (1994), Oncogene 14
(11 ): 1377- 382 (1997)); WO20Q4/063362 (Claim 2): WQ2Q03/Q42681 (Claim 12);
US2003/13479Q-A1 (Page 38-39); WO2002/102235 (Claim 13; Page 296); WO2003/055443 (Page 91-92); WO2002/99122 (Example 2; Page 528-530); WO2003/029421 (Claim 6);
WO2003/024392 (Claim 2; Fig 1 12); WO2002/98358 (Claim 1 ; Page 183); WO2002/54940 (Page 100-101 ); yvO2002/59377(Page 349-350); WO2002/30268 (Claim 27; Page 376): WO2001/48204 (Example; Fig 4): NPJ30 194 bone morphogenetic protein receptor, type IS /pid=NP_001194.1. Cross-references. MIM.-603248; NP_001194.1 ; AY065994
(2) E16 (LAT1 , SLC7A5, Genbank accession no. NM_003486) Biochem. Biophys. Res.
Commun. 255 (2), 283-288 (1999), Nature 395 (6699):288-291 (1998), Gaugitsch, H.W., ef a/ (1992) J. Βίοί Chew. 287 (16): 11287-11273); WO2004 048938 (Example 2):
WQ2004/032842 (Example IV); WO2003/042661 (Claim 12); WO2003/016475 (Claim 1 ); WO2002/78524 (Example 2); WO2002/99074 (Claim 19; Page 127-129); WO2002/86443 (Claim 27; Pages 222, 393); WO2003/003906 (Claim 10; Page 293); WO2002 64798 (Claim 33; Page 93-95); WO2000/14228 (Claim 5; Page 133-136); US2003 224454 (Fig 3);
WO2003/025138 (Claim 12; Page 150); NP_003477 soiute carrier family 7 (cationic amino acid transporter, y+system), member 5 /pid-NP_003477.3 - Homo sapiens; Gross- references: IM;600182; NP_003477.3; NMJJ15923; NM„003486„1
(3) STEAP1 (six transmembrane epithelial antigen of prostate, Genbank accession no. NMJ312449); Cancer Res. 61 (15), 5857-5860 (2001 ), Hubert, R.S., et a (1999) Proc. Natl. Acad Set USA 96 (25); 14523- 14528); WO2004/065577 (Claim 6); WO2004/027049 (Fig 1 L); EP1394274 (Example 1 ); WO2004/016225 (Claim 2); O2003/042661 (Claim 12); US2003/157089 (Example 5); US2003 85830 (Example 5); US2003/064397 (Fig 2); WO2002/89747 (Example 5; Page 618-619); WO2003/022995 (Example 9; Fig 13A, Example 53; Page 1 3, Example 2; Fig 2A); NP_036581 six transmembrane epithelial antigen of the prostate; Cross-references; i :604415; NP„036581.1 ; NM„012449„1 (4) 0772P (CA125, UC16, Genbank accession no. AF361486); J. Btol. Chem, 276
(29):27371 -27375 (2001)); WG2GQ4/Q45553 (Ciaim 14); WO2002/92836 (Claim 6; Fig 12); WO2002/83866 (Claim 15; Page 116-121); US2GG3/124140 (Example 16); Cross- references: GI.-34501467; AA 74120.3; AF361486_1 (5) MPF (MPF, MSLN, SMR, megakaryocyte potentiating factor, mesothelin, Genbank accession no, NM_005823) Yamaguchi, N., et a! Biol. Chem. 269 (2), 805-808 (1994), Proc. Natl. Acad. Sci. U.S.A. 96 (20); 11531 -11536 (1999), Proc. Natl. Acad. Serf. U.S.A. 93 (1 ):136-140 (1996), J, Βίοί Chem. 270 (37}:21984-21990 (1995)); VVO2Q03/101283 (Ciaim 14); (WO2002/102235 (Ciaim 13; Page 287-288); WO2002/101075 (Claim 4; Page 308- 309); VVO2002/71928 {Page 320-321); WO94/10312 (Page 52-57); Cross-references:
I ;601051; NPJ305814.2; NM_005823_1
(8) Napi3b (NAPi-3B, NPTiib, SLC34A2, solute carrier family 34 (sodium phosphate), member 2, type i! sodium-dependent phosphate transporter 3b, Genbank accession no. N J006424) J. Biol. Chem. 277 (22): 19665- 9672 (2002), Genomics 62 (2):281-284 (1999), Fei!d, J A, et a! (1999) Biochem. Biophys. Res. Commun. 258 (3):578-582);
WO2004/022778 (Ciaim 2); EP 1394274 (Example 1 1 ); WO2002/102235 (Claim 13; Page 326); EP0875569 (Ciaim 1 ; Page 17-19); WO2001/57188 (Claim 20; Page 329);
WO2004/032842 (Example IV); WO2001/751 7 (Claim 24; Page 139-140); Cross- references: MiM:604217; NP_006415.1 ; NM_006424_1
(7) Sema 5b (FLJ 0372, KIAA1 45, Mm.42015, SE ASB, SE AG, Semaphorin 5b Hiog, sema domain, seven thrombospondin repeats (type 1 and type -iike), transmembrane domain (I'M) and short cytoplasmic domain, (semaphorin) 5S, Genbank accession no, AB040878); Nagase T. , et al (2000) DNA Res. 7 (2): 143-1 SO); O2QG4/000997 (Ciaim 1 ); WO2003/003984 (Claim 1 }; WO20Q2/06339 (Claim 1 ; Page 50); WO2001/88133 (Ciaim 1 ; Page 41-43, 48-58); WG2003/05 152 (Ciaim 20); WO2003/101400 (Claim 11 ); Accession: Q9P283; E BL; A804087S; BAA95969.1 , Geoew; HGNC:10737 (8) PSCA big (2700050C12Rik, C530008O16Rik, RiKEN cDNA 2700050C12, RIKEN cDNA 2700050C12 gene, Genbank accession no. AY358628); Ross et al (2002) Cancer Res. 62:2546-2553; US2003/129192 (Claim 2); US2004/044180 (Claim 12); US2004/044179 {Claim 11 ); US2QQ3/096961 {CSaim 11 ): US2003/232056 (Example 5); WO2003/105758 (Ciaim 12); US2003/206918 (Example 5); EP 1347046 (Claim 1 ); WO2003/025148 (Claim
20); Cross-references; GS:37182378; AAQ88991.1 ; AY358628J
(9) ETB (Endothelin type B receptor, Genbank accession no. AY27S463); Nakamuta M., et a! Biochem. Biophys. Res. Commun, 177, 34-39, 991 ; Ogawa Y., et at Biochem. Biophys. Res, Commun, 178, 248-255, 1991; Arai H.; et al Jpn Circ. J. 56, 1303-1307, 1992; Arai H„ et ai J. Biol. Chem, 268, 3463-3470, 1993; Sakamoto A., Yanagisa a M., et ai Biochem, Biophys. Res. Commun. 178, 656-663, 1991 ; Elshourbagy NA, et al J. Biol Chem. 288, 3873-3879, 1993; Haend!er B., et ai J. Cardiovaso. Pharmacol. 20, s1-S4, 1992; Tsutsumr ., et ai Gene 228, 43-49, 1999; Strausberg R.L, et al P oc, Nail. Acad. ScL U.S.A. 99, 16899-16903, 2002; Bourgeois C, et ai J. Clin. Endocrinol. Metab. 82, 3116-3123, 1997: Okamoto Y„ et ai Biol, Chem. 272, 21589-21596, 997; VerheiJ J.B., et at Am. 1 Med.
Genet, 108, 223-225, 2002; Hofstra R. .W., et ai Eur. J. Hum. Genet 5, 180-185, 997;
Puffenberger E.G., et al Cell 79, 1257-1266, 1994; Attie T., etal, Hum. Mai. Genet 4, 2407- 2409, 1995; Auricchio A., et al Hum. Mo Genet, 5:351-354, 1996; Amtel J., et al Hum. Moi Genet. 5, 355-357, 1996; Hofstra R. .W.. et ai Nat Genet. 12, 445-447, 1996; Svensson P,J„ et ai Hum. Genet 103, 145-148, 1998; Fuchs S., et al Moi. Med. 7, 115-124, 2001 ; Pingauit V. , et a! {2002} Hum, Genet, 111 , 198-206; WO2004/045516 (Claim 1 );
WG2GQ4/04S938 (Example 2); WO2004 040000 (Claim 151 ); WO2003/087768 (Claim 1 ); WO2003/016475 (Claim 1 ); WO2003/016475 (Claim 1 ); WO2002/61087 (Fig 1 );
WO2003/016494 (Fig 6); WO2003/025138 (Claim 12; Page 144); WO2001/98351 (Claim 1 ; Page 124-125); EP0522868 (Claim 8; Fig 2); WO2001/77172 (Claim 1 ; Page 297-299); US2003/109676; US6518404 (Fig 3); US5773223 (Claim 1a; Col 31-34); WO2004/001004
(10) MSG7S3 (RNF124, hypothetical protein FLJ2G315, Genbank accession no,
N!V1_Q17763}; WO2003/104275 (Claim 1 ); WO2Q04/04634 (Example 2); WO2003/042661 (Ciaim 12); WO2003/083074 (Claim 14; Page 61 ); WO2003/018621 (Claim 1);
WO2003/024392 (Ciaim 2; Fig 93); WO2001/66689 (Example 6); Cross-references:
LocusiD:54894; NP„060233.2; NMJ)17763J
(11 ) STEAP2 (HGNC_8639, iPCA-1 , PCANAP1 , STAMP1, STEAP2, STOP, prostate cancer associated gene 1 , prostate cancer associated protein 1 , six transmembrane epithelial antigen of prostate 2, six transmembrane prostate protein, Genbank accession no.
AF455138); Lab. invest, 82 (11 ); 1573-1582 (2002)): WG2OQ3/Q87308; US2003/084397
(Claim 1 ; Fig 1 ); WO2002/72596 (CSaim 13: Page 54-55); WO2Q01/72982 (Claim 1 ; Fig 48); WO2003/104270 (Claim 11 ); WO2003/104270 (Claim 16); US2004/005598 (Claim 22); WO2003/042661 (Claim 12); US2003/060612 (Claim 12; Fig 10); WO2002/26S22 (Claim 23; Fig 2); WO2002/16429 (Claim 12; Fig 10); Cross-references-. G!;22655488; AAN04080.1 ; AF455138J
(12) TrpM4 (BR22450, FLJ20041 , TRPM4, TRPM4B, transient receptor potential cation channel, subfamily M, member 4, Genbank accession no. NM_017636); Xu, X.Z., et ai Proc. Natl. Acad. Sci U.S.A. 98 (19): 10692-10697 (2001 ), Cell 109 <3):397-407 (2002), J. Biol. Cham. 278 (33):30813-30820 {2003)); US20Q3/143557 (Claim 4); WO2000/40614 (C!aim 14; Page 100-103); WO2002/10382 (Claim 1 ; Fig 9A); WO2003/042661 (Claim 12);
WO2002/3026S (Claim 27; Page 391 ); US2003/219806 (Claim 4); WO2001/62794 (Claim 14; Fig 1A-D); Cross-references; I :606936; NP_060106.2; NM_017636_1
(13) CRIPTO (CR, CR1 , CRGF, CRiPTO, TDGF1. ieratocarcinoma-deriveti growth factor, Genbank accession no. NPJ3032G3 or N _003212); Ciccodicola, A., et al EMBO J, 8
(7): 1987-1991 (1989), Am. Hum. Genet 49 (3):555-585 (1991 )); US2QQ3/224411 (Claim 1 ); WO2003/083041 (Example 1); WO2003/034984 (Claim 12); WO2002/88170 (Claim 2; Page 52-53); WO2003/024392 (Claim 2; Fig 58); WO2002/16413 (Claim 1 ; Page 94-95, 105); WO2002/22808 (Ciaim 2; Fig 1 ); US5854399 (Example 2; Col 17-18); US5792616 (Fig 2); Cross-references: MIM:187395; NP_003203.1 ; NM_003212_1
(14) CD21 (C 2 (Complement receptor 2) or C3DR (C3d/Epstein Barr virus receptor) or Hs.73792 Genbank accession no. M260G4); Fujisaku et ai (1989) J. Biol. Cham. 264 (4):21 8-2125); Wets JJ., et ai J. Exp, Med. 167, 1047-1066, 1988; Moore M., etal Pmc. Natl. Acad. Sci. U.S.A. 84, 9194-9198, 1987; Bare! M., et at Mo!, Immunol. 35, 1025-1031 , 1998; Weis J.J., at al Proc. Nail. Acad. ScL U.S.A. 83, 5639-5643, 1986; Sinha.S. , et ai (1993) J. Immunol. ISO, S311-5320; WO2004/Q4S520 (Example 4); US2004/005538 (Example 1); WO2003 062401 (Claim 9); WO2004/045520 (Example 4); WO91/02536 (Fig 9.1-9.9); WO2004/020595 (Claim 1 ); Accession: P20023; Q13866; Q14212; EMBL; M26004; AAA35786.1.
(15) CD79b (CD79B, CD79p, IGb (immunoglobuiirv-associated beta), B29, Genbank accession no. NMJ300626 or 11038674); Proc. Natl. Acad. $ci. U.S.A. (2003) 100 (7):4126~ 4131 Blood (2002) 100 (9);3068-3076. Muiier et a/ (1992) Eur. J. Immunol. 22 (6):1621- 1625); WO2004/016225 (ciaim 2. Fig 140); WO2003/G87768, US2004/1Q1874 (ciaim 1 , page 102); WO2003/062401 (claim 9); WO2002 78524 (Example 2); US2QG2/150573 (claim 5, page 15); US5644033; WO2003/048202 (claim 1 , pages 306 and 309); WO 99/58658, US6534482 (claim 13, Fig 17A/B); WO2000/55351 (claim 11 , pages 1 145-1 146); Cross- references; M!M;147245; NP„000617.1 ; NM„000626_1 (16) FcRH2 (IFGP4, IRTA4, SPAP1A (SH2 domain containing phosphatase anchor protein 1 a), SPAP1 B, SPAP1 C, Genbank accession no. NM_G30764, AY35813Q); Genome Res, 13 (10):2265-2270 (2003), Immunogenetics 54 (2};S7-95 (2002), Blood S3 (8):2662-2669 (2002), Proc. Nat!. Acad, Sci. U.S.A. 98 (1 ):9772-9777 (2001), Xu, M.J., ef a/ (2001) Blochem. Biophys. Res, Commun, 280 (3):78S-775; WO2004/016225 (Claim 2);
WO2003/077836; WO2001/38490 (Claim 5; Fig 18D-1 -18D-2); WO2003/097803 (Claim 12); WO2003/089624 (Claim 25); Cross-references: MiM:606509; NP_1 10391.2; NM_030764_1
(17) HER2 (Erb82. Genbank accession no. M1 1730); Coussens L, et al Science (1985) 230(4730): 1 132-1 139); Yamamoto T., et al Nature 319, 230-234, 986; Semba K„, et ai Proc. Natl, Acad. Set. U.S.A. 82, 6497-6501 , 1985; Swiercz J.M., et a! J. Cell Btoi. 165, 869- 880, 2004; Kuhns J.J... et al J. Biol. Chem, 274, 36422-36427, 1999; Cho H.-S., et al Nature 421 , 756-760. 2003: Ehsani A., et at (1993) Genomics 15, 426-429; WO2004/048938 (Example 2); WO2004 027049 (Fig 11); WO2004/009622; WO2003/081210;
WO2003 089904 (Claim 9); WO2003/G16475 (Claim 1 ); US2003/1 18592; WO2003/008537 (Claim 1 ); WO2003/055439 (Claim 29: Fig 1A-B); WO2003/025228 (Claim 37; Fig 5C); WO20Q2/22636 (Example 3: Page 95-107); VVO2002/12341 (Claim 68; Fig 7);
WO2002/13847 (Page 71 -74); WO2002/14503 (Page 114-1 17); WO2001/53463 (Claim 2; Page 41 -46); WO2001/41787 (Page 15); WO2000/44899 (Claim 52; Fig 7); WO2000/20579 (Claim 3; Fig 2); US5869445 (Claim 3; Col 31-38); WO9630514 (Claim 2; Page 56-61 ); EP1439393 (Claim 7); WO2004/043361 (Claim 7); WO2004/022709; WO2001/00244 (Example 3; Fig 4); Accession: P04828; EMBL; M1 1767; AAA35808.1. EMBL; M1 1761 ; AAA35808.1
(18) NCA (CEACAM6, Genbank accession no, M1872S); Barnett T., et al Genomics 3, 59- 86, 1988; Tawaragi Y., et a! Biochem. Biophys. Res, Commun, 50, 89-96. 1988; Strausberg
R.L, et al Proc. Natl, Acad. Sci. U.S.A. 99; 16899-16903, 2002; WO2004/063709;
EP1439393 (Claim 7); WO2004/044178 (Example 4); WO2004/031238; WO2003/042661 (Claim 12); WO2002 78524 (Example 2): WO2002/86443 (Claim 27; Page 427);
WO2002/60317 (Claim 2); Accession: P40199; Q14920; EMBL; M29541 ; AAA59915.1. EMBL; M18728 (19) MDP (DPEP1 , Genbank accession no. BC017023); Proc. Natl. Acad. Sci. U.S.A. 99 (26):16899-16903 (2002)); WO2003/016475 (Ciaim 1); WO2002/64798 (Ciaim 33; Page 85- 87); JP05003790 (Fig 6-8); W099/46284 (Fig 9); Cross-references: M I M 79780;
AAH 17023.1 ; BC017023J
(20) IL20Ra (IL20Ra, ZCYTOR7, Genbank accession no. AF184971 ); Clark H.F., et al Genome Res. 13, 2285-2270, 2003; Mungaji A. J., et at Nature 425, 805-811 , 2003;
Biumberg H„ ef al Ceil 104, S-19, 2001 ; Dumoutier L, et a! J. Immunol. 167, 3545-3549, 2001 ; Parrish-Novak J., et al J. Blot. Chain. 277, 47517-47523, 2002; Pfetnev S,, et al (2003) Biochemistry 42: 12617- 12624; Sheikh F., ef a/ (2004) J. Immunol. 172, 2006-2010;
EP1394274 (Example 11 ); US2004/005320 (Example 5): G2QQ3/029262 (Page 74-75); WO2003/002717 (Ciaim 2; Page 63); WO2002/22 53 (Page 45-47); US20Q2/0423S6 (Page 20-21); WO2Q01/46261 (Page 57-59); WO2001/46232 (Page 63-65); W098/37193 {Claim I.¬ Page 55-59); Accession: Q9UHF4; Q6UWA9; Q96SH8; EMBL; AF 184971 ; AAF01320.1.
(21 ) Brevican (SCAN, SEHAB, Genbank accession no. AF229053); Gary B.C., ei ai Gene 256, 139-147, 2000; Ciark H.F., et a! Genome Res. 13, 2265-2270, 2003: Strausberg R.L., et ai P c. Natl. Acad Sci. U.S.A. 99, 16899-16903, 2002; US2G03/186372 (Claim 11 ): US2003/186373 (Claim 11); US2003/119131 (Claim 1 ; Fig 52); US2003/119122 (Claim 1 ; Fig 52); US2003/119126 (Claim 1 ); US2003/1 19121 (Claim 1 ; Fig 52); US2003/119129 (Claim 1 ); US2003/119130 (Claim 1); US2003/1 19128 (Claim 1 ; Fig 52); US2003/119125 (Ciaim 1 ); WO2QG3/016475 (Claim 1); WO2002 02634 (Claim 1 )
(22) EpftS2R (D T, ER , Hek5, EPHT3, TyroS, Genbank accession no. NMJM4442);
Chan.J. and Watt, V.M., Oncogene 6 (6), 1057-1061 (1991 ) Oncogene 10 (5):897-905
(1995), Annu. Rev. NeuroscL 2 :309-345 (1998), int. Rev. Cytol. 198:177-244 (2000));
WO20030 2661 (Claim 12); WO20G053216 {Ciaim 1 ; Page 41 ); WO200 065576 (Claim 1 ); WO2004020583 (Claim 9); WO2003004529 (Page 128- 32); O2000532 6 (Claim 1 ; Page 42); Cross-references: MIM:600997; NP_004433.2; NM_004442_1
(23) ASLG659 (B7h, Genbank accession no. AX092328); US2004/0101899 (Claim 2);
WO2003104399 (Ciaim 11 ); WO2004000221 (Fig 3); US2003/165504 (Claim 1);
US2003/124140 (Exampie 2); US2003/065143 (Fig 60); WO2002/102235 (Claim 13; Page 299); US2003/09158Q (Example 2); WO20Q2 10187 (Claim 6; Fig 10); WO2001/94641 (C!aim 12: Fig 7b) WO2002/02624 (Claim 13; Fig 1 A-1 B); US2002/034749 (Claim 54; Page 45-46): WO2002 06317 (Exampie 2; Page 320-321 , Claim 34; Page 321-322); WO2002/71928 (Page 468-469); WO2002/02587 (Example 1 ; Fig 1 ); WO2001/40269 (Example 3; Pages 190-192); WO2000/36107 (Example 2; Page 205-207); WO2004/053079 (Claim 12); WO2003/004989 (Claim 1 ); WO2002/71928 (Page 233-234, 452-453); WO 01/16318
(24) PSCA (Prostate stern ceil antigen precursor, Genbank accession no. AJ297436); Reiter R.E,. et al Pmc, Natl. Acad. ScL U.S.A. 95, 1735-1740, 1998; Gu Z.„ et al Oncogene 19, 1288-1296, 2000; Biochem, Biop ys. Res, Com un. (2000) 275(3): 783-788;
WO2004/022709; EP1394274 (Example 11 ); US2004/0185S3 (Claim 17); WO2003/008537 (Claim 1 ); WO2002/81646 (Claim 1 ; Page 164); WO2003/003906 (Claim 10; Page 288);
WO2001/40309 (Example 1 ; Fig 17); US2001/Q55751 (Example 1 ; Fig 1 b); VVO2000/32752 (CSaim 18; Fig 1 ); O98/51805 {Claim 17; Page 97); W098/51824 (Claim 10; Page 94); WO9S/40403 (Claim 2; fig 18); Accession: 043653; EMBL; AF043498; AAC39607.1 (25) GEDA {Genbank accession No. AY260763); AAP14954 lipoma HIV1GIC fusion-partner- iike protein /pid-AAP14954.1 - Homo sapiens (human); WO2003/054152 (Claim 20);
WO2003/000842 (CSaim 1 ); WO2003/023013 (Example 3, Claim 20); US2003/194704 (Ciaim 45); Cross-references; G!;30102449; AAP14954.1 ; AY260763_1 (26) BAFF-R (S cell -activating factor receptor, BL'yS receptor 3, BR3, Genbank accession
No. AF 116456); BAFF receptor /pid=NP_443177.1 - Homo sapiens: Thompson, J.S., et a!
Science 293 (5537), 2108-2111 (2001); WO2004 058309; WO2004/01 161 1 ;
WO2003/045422 (Example; Page 32-33); WQ2003/014294 (Claim 35; Fig 6B);
WO2003/035846 (Claim 70; Page 615-616); WO2002/94852 (Col 136-137); WO2002/38766 (Claim 3; Page 133); WO2002/24909 (Example 3; Fig 3); Cross-references: MIM.606269;
NP_443177.1 ; NM„Q52945_1 ; AF 132800
(27) CD22 (B-ce!l receptor CD22-B iSOform, BL-CAM, Lyb-8, Lyb8, SIGLEC-2, FLJ22814,
Genbank accession No. A 026467); Wilson ei ai (1991 ) J, Exp. ed 73:137-146;
WO2003/072036 (Claim 1 ; Fig 1); Cross-references: MiM; 107266; NPJ)Q1762.1 ;
NM_001771_1
(28) CD79a (CD79A, CD79a, immunoglobulin-associated alpha, a B cell-specific protein that covalently interacts with Ig beta (CD79B) and forms a comple on the surface with !g M molecules, transduces a signal involved in B-ceil differentiation), pi; 4.84, MW: 25028 TM: 2 [P] Gene Chromosome: 1Sq13.2, Genbank accession No, NPJ301774.1O); WO2003/088808, US2003/0228319; WO2003/062401 (claim 9); US2002/150573 (claim 4, pages 13-14); W099/58658 (claim 13, Fig 16); WO92/07574 (Fig 1); US5644033; Ha et a! (1992) J. Immunol. 148(5):1526-1531 ; Muifer ef al (1992) Eur. J. Immunol,. 22:1621-1625; Hashimoto et ai (1994) Immunogenetics 4Q(4):287~295; Preud'homme ef al (1992) Clin. Exp, Immunol, 90(1 ): 141-146; Yu et al (1992) J, Immunol, 148(2) 833-637; Sakaguchi et a! (1 88) EMBO J, 7(11 ):3457-3464
(29) CXCR5 (Burkitfs lymphoma receptor 1 , a G protein-coupled receptor that is activated by the CXCL13 chemokine, functions in lymphocyte migration and humoral defense, plays a role in HIV-2 infection and perhaps development of AiDS, lymphoma, myeloma, and leukemia); 372 aa, pi: 8.54 MW: 41S59 TM; 7 [P] Gene Chromosome: 1 q23.3, Genbank accession No. NP_001707.1); WO2004/0400C0; WO2004 0 5426; US2003/105292
(Example 2); US6555339 (Example 2); WO20G2/61087 (Fig 1); WO2001/57188 (Claim 20, page 269); WO2001/72830 (pages 12-13); W02GGG/22129 (Example 1 , pages 152-153, Example 2, pages 254-256); W099/28468 (claim 1 , page 38); US5440021 (Example 2, col 49-52); W094/28931 (pages 56-58); W092/17497 (claim 7, Fig 5); Dobner ef al (1992) Eur. 1 Immunol. 22:2795-2799: Barela ef a/ (1995) Biochem. J. 309:773-779
(30) HLA-DOB (Beta subunit of HC class II molecule (!a antigen) that binds peptides and presents them to CD4+ T lymphocytes); 273 aa, pi: 6.56, MW: 30820.TM: 1 ;Pj Gene
Chromosome: 6p21.3, Genbank accession No. NP J302111.1 ); Tonne!ie et al (1985) EMBO J, 4(1 ):2839-2847; Jonsson et a/ (1989) Immunogenetics 2 (β} 4ί 1-413; Beck et al (1992) J. Mot. Biol. 228:433-4 1; Stfausberg ef a/ (2002) Proc. Natl, Acad. Set USA 99:16898- 16903; Servensus et a (1987) J. Biol. Chem. 262:8759-8766; Beck ef al (1996) J. Mol, Biol, 255:1-13; Naruse et al (2002) Tissue Antigens 59:512-519; W099/58658 (claim 13, Fig 15); US6153408 (Co! 35-38); US5976551 (COi 168-170); US6011146 (col 145-146); Kasahara et a/ (1989) Immunogenetics 30(1 ):66-68; Larhammar ef al (1985) J. Biol. Chem.
26G(26):14111-14119 (31 ) P2X5 (Purinergic receptor P2X iigand-gated ion channel 5, an ion channel gated by extracellular ATP, may be involved in synaptic transmission and neurogenesis, deficiency may contribute to the pathophysiology of idiopathic detrusor instability); 422 aa), pi: 7,63, MW: 47206 TfVS: 1 [P] Gene Chromosome: 17p13,3, Genbank accession No.
NPJ302552.2): Le @i / (1997) FEBS Lett 418(1-2):195-199; WO2004/047749;
WO2003/072035 (claim 10); Touchmsn ei ai (2000) Genome Res. 10:165-173; WO2002/22660 (claim 20); WO2003/093444 (claim 1 ); WO2003/087768 (claim 1 );
WO2003/029277 (page 82)
(32) CD72 (B-cell differentiation antigen CD72, Lyb-2); 359 aa, pi: 8.66, MW: 40225, TM: 1 [P] Gene Chromosome: 9p13.3, Genbank accession No. PJ3G1773.1 ); WO2004042346
(claim 65); WO2003 026493 (pages 51-52, 57-58); WO2000/75655 (pages 105-106); Von Hoegen ef al (1990) J. Immunol. 144(12):4870-4877; Strausberg ef al (2002) Proc. Natl. Acad. Sci USA 99:16899-16903.
(33) LY64 (Lymphocyte antigen 64 (RP105), type I membrane protein of the leucine rich repeat (LRR) family, regu!ates B-cei! aciivatson and apoptosss, loss of function is associated with Increased disease activity in patients with systemic lupus erythematous); 661 aa5 pi; 6.20, MW: 74147 TM; 1 [P] Gene Chromosome: 5q12, Genbank accession No.
NP_005573.1 ); US2GQ2/193567; WO97/0719S (claim 11 , pages 39-42); Miura ef a/ (1996) Genomics 38(3):299-304; Miura et al (1998) Blood 92:2815-2822; VVO2003/083047;
W097/44452 (claim 8, pages 57-61 ); WG20GQ/12130 (pages 24-26)
(34) FcRHI (Fc receptor-like protein 1 , a putative receptor for the immunoglobulin Fc domain that contains C2 type Ig-fike and !TAM domains, may have a role in B-!ymphocyte differentiation); 429 aa. pi; 5.28, MW: 46925 TM: 1 [P] Gene Chromosome: 1q21-1q22, Genbank accession No. NP_443170.1); WO2003/077836; WO2001/38490 (claim 6, Fig 18E-1-18-E-2); Davis ef a/ (2001) Proc Natl, Acad. Sci USA 98(17):9772-9777;
WO2O03/G89S24 (claim 8); EP1347046 (ciaim 1 ); WO2003/089624 (claim 7)
(35) IRTA2 (Immunoglobulin superfamily receptor translocation associated 2, a putative imrnunoreceptor with possible roies in B ceil development and lympftomagenesis;
deregulation of the gene by translocation occurs in some 8 cell malignancies); 977 aa, pi: 6.88, MW: 106468, TM: 1 [P] Gene Chromosome: 1q21 , Genbank accession No.
Human:AF343662, AF343663, AF343664, AF343665, AF369794, AF397453, AK090423, AK090475, AL834187, AY358085; Mouse:AK089756, AY158090, AY506558; NP_1 12571.1 ; WO2003/024392 (claim 2, Fig 97); Nakayama ef al (2000) Biochem. Biophys. Res.
Commun. 277(1 ):124-127; WO2003/077836; WO2001/38490 (claim 3, Fig 18B-1-18B-2)
(36) TENB2 (TMEFF2, tomoreguBn, TPEF, HPP1, T , putative transmembrane
proteoglycan, related to the EGF/heregulin family of growth factors and fo!listatin ; 374 aa, NCB! Accession: AAD55776, AAF91397, AAG49451 , NCSi RefSeq: NPJ357276; NCBi Gene: 23671 ; QM\M: 605734; SwissProt Q9UIK5; Genbank accession No. AF179274; AY358907, CAF85723, CQ782436; WO2004 074320; JP2004113151 ; WO2003/042661 ;
WO2003/009814; EP1295944 (pages 69-70); WO2002/30268 (page 329); WO2001/90304; US2004/249130; US2GQ4/022727; WO20Q4/063355; US2QQ4/197325; US2QQ3/232350; US2004/QQ5563; US2003/124579; Ho ie et a! (2000) Genomics 67:146-152; UchSda et al (1999) Bioch&m. Biophys. Res. Com un. 266:593-602; Liang ef a/ (2OO0) Cancer Res, 60:4907-12; Giynne-Jones ef a! (200 ) Int J Cancer. Oct IS: 94(2); 178-84.
The parent antibody may also be a fusion protein comprising an albumin-binding peptide (ABP) sequence (Dennis ef at. (2002) "Albumin Binding As A General Strategy For improving The Pharmacokinetics Of Proteins" J Bio! Chem, 277:35035-35043; WO
01/45746). Antibodies of the invention include fusion proteins with ABP sequences taught by: (!) Dennis et a {2002) J Biol Chem, 277:35035-35043 at Tables III and IV, pag 35038; (is) US 2004/0001827 at [0076]; and (iii) WO 01/45746 at pages 12-13, and aii of which are incorporated herein by reference.
In one embodiment, the antibody has been raised to target specific the tumour related antigen ανβ6. The cell binding agent ma be labelled, for example to aid detection or purification of the agent either prior to incorporation as a conjugate, or as part of the conjugate. The label may be a biotin label. In another embodiment, the cell binding agent may be labelled with a radioisotope. R and R'
in one embodiment, R is independently selected from optionally substituted€ η alkyf,
C3.20 heterocyciy! and C ;·>;>;; aryi groups. These groups are each defined in the substituents section below.
In one embodiment, R is independently optionally substituted Ci-12 alkyl.
In one embodiment, R is independently optionally substituted C3.2o heterocyclyl.
In one embodiment, R is independently optionally substituted C5_20 aryi.
In one embodiment, R is independently optionally substituted CM2 alkyl. Described above in relation to R2 are various embodiments relating to preferred alkyl and aryi groups and the identity and number of optional substituents. The preferences set out for R2 as it applies to R are applicable, where appropriate, to all other groups R, for examples where R6, R7, R8 or R9 is R.
The preferences for R apply also to R'.
In some embodiments of the invention there is provided a compound having a substituent group -NRR'. in one embodiment,. R and R' together with the nitrogen atom to which they are attached form an optionally substituted 4-, 5-, 6- or 7-membered heterocyclic ring. The ring may contain a further heteroatom, for example N, O or S.
In one embodiment, the heterocyclic ring is itself substituted with a group R. Where a further N heteroatom is present, the substituent may be on the N heteroatom.
R"
R" is a Cg. -ta aikylene group, which chain may be interrupted by one or more heteroatoms, e.g. O, S, N(H), HMe and/or aromatic rings, e.g. benzene or pyridine, which rings are optionally substituted.
in one embodiment, R" is a C;-. -; a!kyiene group, which chain may be interrupted by one or more heteroatoms and/or aromatic rings, e.g. benzene or pyridine.
in one embodiment, the aikylene group is optionally interrupted by one or more heteroatoms seiected from O, S, and NMe and/or aromatic rings, which rings are optionally substituted. in one embodiment, the aromatic ring is a C¾.¾) arylene group, where arylene pertains to a divalent moiety obtained by removing two hydrogen atoms from two aromatic ring atoms of an aromatic compound, which moiety has from 5 to 20 ring atoms.
i one embodiment, R" is a C3. i2 aikylene group, which chain may be interrupted by one or more heteroatoms, e.g. O, S, N(H), NMe and/or aromatic rings, e.g. benzene or pyridine, which rings are optionally substituted by NH2. in one embodiment, R" is a C¾.½ aikylene group.
In one embodiment, R" is selected from a C3, C5, C7, C9 and a Cn aikylene
In one embodiment, R" is selected from a C3, C5 and a C7 aikylene group,
in one embodiment, R" is selected from a C3 and a C5 aikylene group,
in one embodiment, R* is a Cs aikylene group,
in on embodiment, R" is a C5 aiky!ene group. The aikylene groups listed above may be optionally interrupted by one or more heteroatoms and/or aromatic rings, e.g. benzene or pyridine, which rings are optionally substituted. The alkylene groups listed above may be optionally interrupted by one or more heteroatoms and/or aromatic rings, e.g. benzene or pyridine.
The alkylene groups listed above may be unsubstituted linear aliphatic alkylene groups.
X
In one embodiment, X is selected from O, S, or N(H).
Preferably, X is O. E
The compounds where one or both C rings is replaced by a ring of formula E, have a group Rs which with either of or R:\ together with carbon atoms of the C ring to which they are attached, form an optionally substituted benzene ring. The optionally substituted benzene ring may be regarded as fused to the C ring of the pyrrolobenzodiazepine. The fused benzene ring may be referred to as the D ring. The structure of the fused ring is illustrated below:
Figure imgf000036_0001
W and R2 R3 and a where each of D ', D2, D3 and D4 represents H or a substituent. In one embodiment, the benzene ring is unsubstituted.
In one embodiment, the benzene ring is optionally substituted with one, two, three of four groups selected from OH, CN, R, OR5 0~SQ2-R, C02R, COR, SH, SR, NH2, NHR, NRR', NOs, e3Sn and ha!o.
in one embodiment, the benzene ring is monosubstituted. The monosubstituent may be any one of D\ D2, D3 or D'¾ (the rest being H). in one embodiment the benzene ring is substituted at D2, and D!, D¾ and D4 are eac H. In one embodiment the benzene ring is substituted at D3, and D\ D2 and D are each . In one embodiment, R2 with R1 , together with carbon atoms of the C ring to which they are attached, form an optionally substituted benzene ring.
The preferences for V and W are set out beiow.
F
in the compounds where one or both C rings is replaced by a ring of formula F:
in one embodiment, U is CH;, when T is NR. BH, SO, or S02.
in one embodiment, T is CH2 or CO when U is NR, O or S.
In one embodiment, T is selected from CH2 and CO.
In one embodiment, U is selected from NR, O and S.
In one embodiment, Y is (CH2)n, where n is 1 or 2. in one embodiment, the C ring of the compound A-B has a structure selected from those shown below:
Figure imgf000037_0001
V and W
V and W are each selected from (CH?)fi> O, S, NR. CHR, and CRR' where n is 2,3 or 4, except that V is C when R1 and R2, together with carbon atoms of the C ring to which they are attached, form an optionally substituted benzene ring, and W is C when R3 and R2, together with carbon atoms of the C ring to which they are attached, form an optionally substituted benzene ring. In one embodiment, when one of V and W is C, the other of V and W is selected from CH2 and NR.
In one embodiment, when one of V and W is C, the other of V and W is CH2.
Preferred Compounds
in one embodiment, the conjugate is a dimer wherein each of the PBD moieties has a C2 methylene group i.e. each R2 is =CH2. It is preferred that the cell binding agent is an antibody. in another embodiment, the conjugate is a dimer wherein each of the monomers has a C2 aryi group i.e. each R2 is optionally substituted Cg.20 aryi, and there is a double bond between C2 and G3 in each PSD moiety, it is preferred that the ceii binding agent is an antibody.
C2 Alkylene
in o
and
Figure imgf000038_0001
wherein CBA is a ce!i binding agent such as an antibody or a cyclic or linear peptide, and n is 0 or 1 , Y, R and R are as previously defined, and RE and RE" are each
independently selected from H or RD
For each of the compounds above, the following preferences may apply, where appropriate:
n is 0;
n is 1 ;
RE is H; RE is RD, where RD is optionally substituted alkyl;
RE is RD, where RD is methyl;
CBA is an antibody;
CBA is a cyclic peptide;
RL1 and RL2 are H;
RL1 and RL2 are Me.
C2 Ary!
in one em
and more
Figure imgf000039_0001
wherein CBA ss a ce!i binding agent such as an antibody or a cyclic or linear peptide, Y, and RL2 are as previously defined Ar1 and Ar2 are each independently optionally substituted C« ;¾ aryl, and n is 0 or 1 Ar1 and Ar2 may be the same or different. in one embodiment, Ar1 and Ara in each of the embodiments above are each independently selected from optionally substituted phenyl, furanyl, thiophenyi and pyridyl. In one embodiment, Ar1 and Ar2 in each of the embodiments above is optionally substituted phenyl.
In one embodiment, Ar1 and Ar2 in each of the embodiments above is optionally substituted thien-2-yl or thien-3-yl.
In one embodiment, Ar1 and Ar2 in each of the embodiments above is optionally substituted quinolinyl or isoquinolinyl. The quinolinyl or isoquinolinyl group may be bound to the PBD core through any available ring position. For example, the quinoiinyi may be quinolin-2-yl, quinolin-3-yl, quinolin-4yl, quinoSin-5-yi, quinolin-6-yi, qutnolin-7-yl and quinolin-8-yl. Of these quinolin-3-yl and quinoHn-6-yl may be preferred. The isoquinolinyl may be isoquinolin-1 -yl, isoquinolin-3-yl, isoquinolin-4yl, isoquinolin-5-yl, isoquinolin-6-yl, isoquinolin-7-yl and isoquinolin-8-yl. Of these isoquinolin-3-yl and isoquinolin-6-yl may be preferred.
C2 Vinyl
In one embodiment, the conjugate '
Figure imgf000040_0001
and more preferably:
Figure imgf000041_0001
wherein CBA is a cell binding agent such as an antibody or a cyclic or linear peptide,
Y, RL1 and RL2 are as previously defined, RV1 and Rvz are indepdentiy selected from H, methyl, ethyi and phenyl {which phenyl may be optionally substituted with fiuoro, particularly in the 4 position) and C&i< heterocyciyi, and n is 0 or 1. RV1 and R s may be the same or different.
In some of the above embodiments, RV and RV2 may be indepdentiy selected from H, phenyl and 4~fiuorophenyi.
Preferred intermediates
The present invention also provides intermediates for use in the preparation of the conjugate compounds described herein. Preferred intermediates are described below, and correspond closely to the preferred conjugates described above.
In one embodiment the intermediate is a com ound:
Figure imgf000042_0001
and more referably:
Figure imgf000042_0002
wherein n is 0 or 1 , Y, R and are as previously defined, and R and R are each independenily seiected from H or R°
In one embodiment the intermediate is a compound:
Figure imgf000043_0001
and more referably:
Figure imgf000043_0002
wherein Y, R and RL2 are as previously defined Ar and Ar are each independently optionally substituted Cs.20 aryi, and n is 0 or 1 , Ar1 and Ar2 may be the same or different.
In one embodiment the intermediate is a compound:
Figure imgf000044_0001
wherein Y, R and R12 are as previously defined, Rv1 and RV2 are fndepdently selected from H, methyl, ethyl and phenyl (which phenyl may be optional!y substituted with fluoro, particularly in the 4 position) and C5_6 heterocyclyl, and n is 0 or 1. RV and RV2 may be the same or different. Substituents
The phrase "optionally substituted" as used herein, pertains to a parent group which may be unsubstituted or which may be substituted.
Unless otherwise specified, the term "substituted" as used herein, pertains to a parent group which bears one or more substituents. The term "substituent" is used herein in the conventional sense and refers to a chemical moiety which is covalently attached to, or if appropriate, fused to, a parent group. A wide variety of substituents are well known, and methods for their formation and introduction into a variety of parent groups are also well known.
In a preferred embodiment, the substituents described herein (which include optional substituents) are limited to those groups that are not reactive to a cell binding agent. The link to the cell binding agent in the present case is formed from the N10 position of the PBD compound through a linker group (comprising, for example, L , L2 and A) to the cell binding agent. Reactive functional groups located at other parts of the PBD structure may be capable of forming additional bonds to the cell binding agent (this may be referred to as crosslinking). These additional bonds may alter transport and biological activity of the conjugate. Therefore, in some embodiment, the additional substituents are limited to those lacking reactive functionality. in one embodiment, the substituents are selected from the group consisting of R, OR, SR, NRR', N03, halo, C02R, COR, CONHa, CONHR, and CONRR'.
in one embodiment, the substituents are selected from the group consisting of R, OR, SR, NRR\ N02, C02R, COR, CONH2, CONHR, and CONRR'.
In one embodiment, the substituents are selected from the group consisting of R, OR, SR, NRR', N02, and halo.
In one embodiment, the substituents are selected from the group consisting of R, OR, SR, NRR', and N02.
Any one of the embodiment mentioned above may be applied to any one of the substituents described herein. Alternatively, the substituents may be selected from one or more of the groups listed fae!ow.
Examples of substituents are described in more detail below.
CMJ alk l: The term "CMS aikyf" as used herein, pertains to a monovalent moiety obtained by removing a hydrogen atom from a carbon atom of a hydrocarbon compound having from 1 to 12 carbon atoms, which may be aliphatic or aiicyciie, and which may be saturated or unsaturated (e.g. partially unsaturated, fully unsaturated). Thus, the term "alkyi" includes the sub-classes alkenyl, alkynyl, cycloalkyl, etc., discussed below.
Examples of saturated alkyl groups include, but are not limited to, methyl (d), ethyl (C2), propyl (C3), butyl (C,;)? pentyi (C; ). hexyl (C6) and heptyl (C7). Examples of saturated linear alkyl groups include, but are not limited to, methyl (C-,), ethyl (C;.), n-propy! (C;i}, n-buty! (C ), n-penty! (amy!) (C5), n-hexyl (C6) and n-heptyl (C7).
Examples of saturated branched aikyi groups include iso-propyl (C3), iso-butyl (C4), sec-butyl (C4), tert-butyl (C4), iso-pentyl (C5), and neo-pentyl (C5).
An alkyi group may optionally be interrupted by one or more heteroatoms selected from O, {H) and S. Such groups may be referred to as "heteroalkyl". C2-20 Heteroalkyl: The term "C2-12 heteroalkyl" as used herein, pertains to a monovalent moiety obtained by removing a hydrogen atom from a carbon atom of a hydrocarbon compound having from 2 to 12 carbon atoms, and one or more heteroatoms selected from
O, N(H) and S, preferably O and S. Examples of heteroalkyl groups include, but are not limited to those comprising one or more ethylene glycol units of the type -(OCH2CH2)-. The terminal of a heteroalkyl group may be the primary form of a heteroatom, e.g. -OH, -SH or -NH2. In a preferred embodiment, the terminal is -CH3. Cj„« Alkenyi: The term "QM2 aikenyi" as used herein, pertains to an alkyl group having one or more carbon-carbon double bonds.
Examples of unsaturated a!keny! groups include, but are not limited to, ethenyl (vinyl, -CH*CH2), 1-propenyl (-CH*CH-CH3), 2-propenyl (allyl, -CH-CH=CH2), isopropenyl
{1-methylvinyl, -C(CH3)=CH2), butenyl (C4), pentenyl (C5), and hexenyl (C6).
C2-i2 alkynyl: The term "C2.12 alkynyf as used herein, pertains to an alkyl group having one or more carbon-carbon triple bonds. Examples of unsaturated alkynyl groups include, but are not limited to, ethynyl (-C≡CH) and 2-propynyl (propargyl, -CH2-C≡CH).
C3-12 cycloalkyl: The term "C3.12 cycloalkyl" as used herein, pertains to an alkyl group which is also a cyciyl group; tha is, a monovalent moiety obtained by removing a hydrogen atom from an alicyclic ring atom of a cyclic hydrocarbon (carbocyclic) compound, which moiety has from 3 to 7 carbon atoms, including from 3 to 7 ring atoms. Examples of cycloaikyi groups include, but are not limited to, those derived from:
saturated monocyclic hydrocarbon compounds:
cyclopropane (C3), cycSobutane (C ), cyciopentane (C5), cyciohexane (C6), cycioheptane (C7), methylcyclopropane (C4), dimethylcyclopropane (C5), methylcyclobutane (C5), dimethylcyclobutane (C6), methylcyclopentane (C6), dimethylcyclopentane (C7) and methylcyclohexane (C7);
unsaturated monocyclic hydrocarbon compounds:
cyclopropene (C3), cyclobutene (C4), cyclopentene (C5), cyclohexene (C6),
methylcyclopropene (C4), dimethylcyclopropene (C5), methylcyclobutene (C5),
dimethylcyclobutene (C6), methylcyclopentene (C6), dimethylcyclopentene (C7) and methylcyclohexene (C7); and
saturated polycyclic hydrocarbon compounds:
norcarane (C7), norpinane (C7), norbomane (C7).
C3_2o heterocyclyl: The term "C3_2Q heterocyclyl" as used herein, pertains to a monovalent moiety obtained by removing a hydrogen atom from a ring atom of a heterocyclic compound, which moiety has from 3 to 20 ring atoms, of which from 1 to 10 are ring heteroatoms.
Preferably, each ring has from 3 to 7 ring atoms, of which from 1 to 4 are ring heteroatoms.
In this context, the prefixes (e.g. C3-20, C3-7, C5-6, etc.) denote the number of ring atoms, or range of number of ring atoms, whether carbon atoms or heteroatoms. For example, the term "C^heterocyciyi", as used herein, pertains to a heterocyclyl group having 5 or 6 ring atoms.
Examples of monocyclic heterocyciy! groups include, but are not limited to, those derived from:
Ni .' aziridine (<¾}, azetidine (C ), pyrrolidine (tetrahydropyrrole) (G¾), pyrro!sne (e.g.,
3-pyrroline, 2,5-dihydropyrrole) (C5), 2H-pyrrole or 3H-pyrrole (isopyrrole, isoazole) (C5), piperidine (C6), dihydropyridine (C6), tetrahydropyridine (C6), azepine (C7);
O-i : oxirane (C3), oxetane (C4), oxolane (tetrahydrofuran) (C5), oxole (dihydrofuran) (C5), oxane (tetrahyd ropy ran) (C6), dihydropyran (C6), pyran (C6), oxepin (C7);
S^: thiirane (C3), thietane (C4), thiolane (tetrahydrothiophene) (C5), thiane
(ietrahyo!rothiopyran) (Cs), ihiepane (Ο,·);
<¾; dioxolane (C-: ). dioxane (C6), and dsoxepane (C7);
(¾; trioxane (C6); N2: imidazolidine (C5), pyrazolidine (diazolidine) (C5), imidazoline (C5), pyrazoline
{dihydropyrazoie} (Cs)< piperazine (C¾);
iO tetrahydrooxazo!e (Cg), dihydrooxazoie C5), tetrahydroisoxazole (C5),
dihydroisoxazoie (Cs), morphoiine (C6), tetrahydrooxazine (C6), dihydrooxazine (C6), oxazine (d);
S-i : thiazoline (C5), thiazolidine (C5), thiomorpholine (C6);
2Oi : oxadiazine (C6);
O-IS-I: oxathiole (C5) and oxathiane (thioxane) (C6); and,
oxathiazine (C6).
Examples of substituted monocyclic heterocyciyi groups include those derived from saccharides, in cyclic form, for example, furanoses (C5), such as arabinofuranose, lyxofuranose, ribofuranose, and xylofuranse, and pyranoses (Ce), such as aSlopyranose, altropyranose, glucopyranose, mannopyranose, gulopyranose, idopyranose,
galactopyranose, and talopyranose.
Cs-so ary!; The term "C5.20 aryT, as used herein, pertains to a monovalent moiety obtained by removing a hydrogen atom from an aromatic ring atom of an aromatic compound, which moiety has from 3 to 20 ring atoms. Preferably, each ring has from 5 to 7 ring atoms.
In this context, the prefixes (e.g. C3-20, C5-7, C5-6, etc.) denote the number of ring atoms, or range of number of ring atoms, whether carbon atoms or heteroatoms. For example, the term "C^ aryi" as used herein, pertains to an aryi group having 5 or 6 ring atoms. The ring atoms may be all carbon atoms, as in "carboaryl groups".
Examples of carboaryi groups include, but are not !!mited to, those derived from benzene (i.e. phenyl) (Cg), naphthalene (do}> azulene (do), anthracene (CM)« phenanthrene (On), naphthacene (C1S), and pyrene (de)- Examples of aryi groups which comprise fused rings, at least one of which is an aromatic ring, include, but are not limited to, groups derived from indane (e.g. 2,3-dihydro- H-indene) (Cf,), indene {<¼), isoindene <¾), tetraline (1 ,2,3,4-tetrahydronaphthaiene (do).,
acenaphthene (Ci2), fiuorene (C !S), phenalene ( a), acephenantftrene (ds), and aceanthrene (C16)- Alternatively, the ring atoms may include one or more heteroatoms, as in "heteroaryl groups". Examples of monocyclic heteroaryl groups include, but are not limited to, those derived from;
-: pyrrole (azoie) (C5), pyridine (azine) (Ce);
Oi: furan (oxole) (C5);
S^: thiophene (thiole) (C5);
iOi: oxazole (C5), isoxazole (C5), isoxazine (Cs);
N2Oi oxadiazole (furazan) (C5);
bizO^. oxatriazole (C5);
N^ : thiazole (C5), isothiazole (C5);
Na: imidazole (1 ,3-diazQle) (Cs), pyrazo!e (1 ,2-diazole) (C5), pyridazine (1 ,2-diazine) (C6), pyrimidine (1 ,3-diazine) (Cs) (e.g., cytosine, thymine, uracil), pyrazine (1 ,4-diazine) (C6); N3; triazole (Cg}< tria2ine (Cs); and,
N£}: tetrazofe (C5).
Examples of heteroaryS which comprise fused rings, include, but are not limited to:
C9 (with 2 fused rings) derived from benzofuran (O-,), isobenzofuran (O^, indole (N-i), isoindole (N-i), indolizine (N-i), indoline ( τ), isoindoline (N-i), purine (N ) (e.g., adenine, guanine), benzimidazole (N2), indazole (N2), benzoxazole
Figure imgf000049_0001
benzodioxole (02), benzofurazan (N201), benzotriazole (N3), benzothiofuran (Si), benzothiazole (N1S1), benzothiadiazole (N2S);
C1;s (with 2 fused rings) derived from chromene (d), tsochromene (Oi), chroman (Oj), isochroman (Oi), benzodioxan {<¾). quino!ine (Ni), isoquino!ine (N-j), quinoiizirie (Ni), benzoxazine (Ν,Ο,), benzodiazine (N2)» pyridopyridine (N2), quinoxaiine (N2), qutnazoiine (N2), cinnoline (N2), phthalazine (N2), naphthyridine (N2), pteridine (N4);
Cn (with 2 fused rings) derived from benzodiazepine (N2);
C :5 (wiih 3 fused rings) derived from carbazole (Ni), dibenzofuran (Ch), dibenzothiophene (Sj), carboline (N2), perimidine {Na), pyridoindole (N2); and,
CM (with 3 fused rings) derived from acridsrte (Ni), xanthene (CM), thioxanthene (Si), oxanthrene {C½}, phenoxathiin {OSi' phenazine (N2), phenoxazine (Ν-ιΟ-ι), phenothiazine ( 1S-1), thianthrene (S2), phenanthridine ( ^, phenanthroline (N2), phenazine (N2).
The above groups, whether alone or part of another substituent, may themselves optionally be substituted with one or more groups selected from themselves and the additional substituents listed below. Halo: -F, -CI, -Br, and -I. Hydroxy: -OH. Ether: -OR, wherein R is an ether substituent, for example, a Ch alky! group {also referred to as a Ct.r aikoxy group, discussed below), a Ο3.20 heterocyciy! group (also referred to as a C:¾.;.0 heterocycSyloxy
Figure imgf000050_0001
group (also referred to as a C5-2o aryloxy group), preferably a Chalky! group. Aikoxy: -OR, wherein R is an alkyl group, for example, a C-i_7 alkyl group. Examples of C1-7 aikoxy groups include, but are not limited to, -OMe (methoxy), -OEt (ethoxy), -O(nPr) (n- prapoxy), -O(iPf) (isopropoxy), -O(nSu) (h-butoxy), -O(sBu) (sec-butoxy), -O(iBu)
(isobutoxy), and -0(tBu) {tert-butoxy}. Acetal: -CH(OR ')(ORa)t wherein 1 and R¾ are independently acetal substituents, for example, a Ch alky! group, a Cj.ao heterocyclyl group, or a C^ ary! group, preferably a C-)-7 alkyl group, or. In the case of a "cyclic" acetal group, R1 and R2, taken together with the two oxygen atoms to which they are attached, and the carbon atoms to which they are atiached, form a heterocyclic ring having from 4 to 8 ring atoms. Examples of acetal groups include, but are not limited to. -CH(OMe)2, -CH(OEt)¾ and -CH(OMe)(OEt).
Hemiacetal: -CH(OH){OR'!), wherein R1 is a hemiacetal substituent, for example, a C lkyl group, a C3.aa heterocyciyi group, or a C C aryi group, preferably a Ch alk ! group.
Examples of hemiacetal groups include, but are not limited to, -CH(OH){OMe) and - CH(OH)(OEt).
Ketal: -CR(ORs)(OR2), where R1 and R2 are as defined for acetals, and R is a ketal substituent other than hydrogen, for example, a C1-7 alkyl group, a Ο3_20 heterocyciyi group, or a Cs-jo ar i group, preferably a Ch alk ! group. Examples keta! groups include, but are not limited to, -C(Me)(OMe}¾ -0(Μβ)(ΟΕ¾ -C<Me)(OMe)(OEt), -C{B)(OMe)¾ -C(Et)iOEt)2l and -C(Et)(OMe)(OEt).
Hemiketal: -CR(OH)(OR1), where R is as defined for hemiacetals, and R is a hemiketal substituent other than hydrogen, for example, a Ch lky! group, a 03.¾ heterocyciyi group, or a C:... ;: aryi group, preferably a d.? alkyi group. Examples of hemiacetal groups include, but are not limited to, -C(Me)(OH)(OMe), -C(Et)(OH)(OMe), -C(Me)(OH)(OEt), and
-C(Et)(OH)(OEt).
Oxo (keto, -one): =0.
Thione (thioketone): =S.
Imino (imine): -NR, v/herein R is an imino substituent, for example, hydrogen, Ci.? alkyi group, a heterocyciyi group, or a <-½.¾> aryl group, preferably hydrogen or a d.7 alkyi group. Examples of ester groups include, but are not limited to, =NH, =NMe, =NEt, and =NPh.
Formyl (carbaldehyde, carboxaldehyde): -C(=0}H, Acyi (keto): -G(~0)R, wherein R is an acyi substituent, for example, a d./aik l group (also referred to as Ci^ alkyiacyl or C17 aikartoyi).. a Ο3.2ο heterocyciyi group (also referred to as C:¾.20 heierocyc!ylacy!), or a C^so a yl group {also referred to as Cs-soarylacyl), preferably a Ch alky! group. Examples of acyi groups include, but are not limited to, -G(=0)CH3 (acetyl), -C(=O)CH2CH3 (propionyi), -C(=0)C(CH3)3 (t-butyryl), and -C(=0)Ph (benzoyl, phenone).
Carboxy (carboxylic acid): -C(=0)OH. Thiocarboxy (thiocarboxylic acid): -C(=S)SH. Thiolocarboxy {thiolocarboxylic acid): -C(=0)SH. Thionocarboxy (thionocarboxylic acid): -C(=S)OH. imidic acid: -C(=NH)OH.
Hydroxamic acid: -C(=NOH)OH.
Ester (carboxylate, carboxylic acid ester, oxycarbonyl): -C(=0)OR, wherein R is an ester substituent, for example, a d..? alky! group, a C:?..;¾ heterocyciyi group, or a Ο&¾ο ar t group, preferably a Ci.7 aikyi group. Examples of ester groups include, but are not limited to, -C(=0)OCH¾ -C(=0)OCH2GH3, ~C{=0)OC(CH3)3, and -C(=0}OPh. Acyloxy (reverse ester): -QC(=0)R, wherein R is an acyloxy substituent, for example, a C ? aikyl group, a Ca^o eterocyciyi group, or a Canary! group, preferabiy a Chalky! group. Examples of acyloxy groups inciude, but are not limited to, ~OC(=0)CH3 (acetoxy),
-OC(=0)CH2CH3, -OC{=0)C(CH3)3, -OC(=0)Ph, and -OC(=0)CH2Ph.
Oxycarboyioxy; -OC(=0)ORt wherein R is an ester substituent, for example, a Ci ? aiky! group, a G3.¾j heterocyciyl group, or a C's-joaryl group, preferably a d.? alkyi group.
Examples of ester groups include, but are not limited to, -OC(*O cH3, -OC{=O CH2CHa, -OC(=0)OC(CH3)3, and -OC(=0)OPh.
Amino: - R1^, wherein R1 and R are independently amino substttuents, for example, hydrogen, a C ; aikyi group (also referred to as Ci-? alkyiamino or dj-C ralkylamino), a C^Zo heterocyciyl group, or a C^o i group, preferably H or a d.? alkyi group, or, in the case of a "cyciie* amino group, R1 and Ra, taken together with the nitrogen atom to which they ar attached, form a heterocyclic ring having from 4 to 8 ring atoms Amino groups may be primary (-NH2), secondary (-NHR1), or tertiary (-NHR'^R2). and in cationic form, may be quaternary (-*NR R2R3). Examples of amino groups inciude, but are not limited to, -NH2, -NHCH3, -NHC(CH3)2, -N(CH3)2, - (CH2CH3)2, and -NHPh. Exampies of cyclic amino groups include, but are not limited to, aziridino, azetidino, pyrrolidino, piperidino, piperazino, morpholino, and thiomorpholino.
Amido (carbamoyl, carbamyl, aminocarbonyl, carboxamide): -C{=0)NR1R2, wherein R1 and R2 are independently amino substituents, as defined for amino groups. Examples of amido groups include, but are not limited to, -C(=0)NH2, -C(=0)NHCH3, -C(=0)N(CH3)2,
-C(~0)NHCH2CH3, and -C(=0)N(CH2CH3)2, as weil as amido groups in which R' and R3, together with the nitrogen atom io which they are attached, form a heterocyclic structure as in, for example, piperidinocarbonyl, morpholtnocarbonyl, thiomorphoSinocarbonyl, and piperazinocarbonyl.
Thioamido (thiocarbamyl): -C{~S)NR1R2, wherein R1 and R2 are independently amino substttuents, as defined for amino groups. Examples of amido groups include, but are not limited to, -C(=S)NH¾ -C(-S)NHCH3, -C(=S)N(CH3)2, and -C(=S)NHCH2CH3. Acylarnido (acylamino): - R'CI-OJR2, wherein 1 is an amide substituent for example, hydrogen, a C Y alkyi group, a C3.2i) heterocyciyl group, or a C^ar ! group, preferabiy hydrogen or a Chalky! group,, and Ra is an acyl substituent, for example, a C^ alkyl group, a C3.20 heterocyclyi group, or a C^ary! group, preferably hydrogen or a Ch alky! group. Examples of acyiamide groups include, but are not limited to, -NHC(=0)CH3 ,
-NHC(»0)CH2CH3> and ~ HC{=0)Ph. R1 and R2 may togeiher form a cyciic structLfre, as in, for example, succinimidyl, maleimidyl, and phthalimidyl:
Figure imgf000053_0001
succinimidyl maleimidyl phthalimidyl
Aminocarbonyioxy; -OC(=0)NR1R:'l wherein R1 and R2 are independently amino
substiiuents, as defsned for amino groups. Examples of aminocarbonyioxy groups include, but are not limited to, -OC(=0)NH2, -OC(=0)NHMe, -OC(=0)NMe2, and -OC(=0)NEt2.
Ureido: -N(R1)CONR2R3 wherein R2 and R3 are independently amino substituents, as defined for amino groups, and R1 is a ureido substituent, for example, hydrogen, a Ch alk ! group, a C3.3a heterocyciyi group, or a Cg^ aryl group, preferably hydrogen or a Ch alky! group. Examples of ureido groups include, but are not limited to, -NHCONH2, -NHCONHMe, -NHCONHEt, -NHCONMe2, -NHCONEt2, -NMeCONH2, -NMeCONHMe, -NMeCONHEt, - NMeCONMe2, and -NMeCONEt2.
Guanidino: -NH-C(=NH)NH2.
Tetrazolyl: a five membered aromatic ring ur nitrogen atoms and one carbon atom,
Figure imgf000053_0002
Imino: =NR, wherein R is an imino substituent, for example, for example, hydrogen, a Ci_7 alkyl group, a C3.2o heterocyciyi group, or a C¾.20 aryl group, preferably H or a C^/alkyl group. Examples of imino groups include, but are not limited to, =NH, =NMe, and =NEt.
Amidine (amidine): -C{=NR)NR2! wherein each R is an amidine substituent, for example, hydrogen, a C1.7 alkyl group, a C^so heterocyciyi group, or a C5-2o aryl group, preferably H or a C^ alkyl group. Examples of amidine groups include, but are not limited to, -C(=NH)NH2, -C(=NH)NMe2, and -C(=NMe)NMe2.
Nitro: -N02.
Nitroso: -NO. Azido: -N3. Cyano (nitrile, carbonitrile): -CN. isocyano: -NC. Cyanato: -OCN.
Isocyanato: -NCO. Thiocyano (thiocyanato): -SCN. Isothiocyano (isothiocyanato): -NCS. Sulfhydryl (thiol, mercapto): -SH.
Thioether (sulfide): -SR, wherein R is a thioether substituent, for example, a C -7 alkyl group (also referred to as a Ct.raikylthio group}, a (¾.20 heterocyclyl group, or a C5.20 aryl group, preferably a Ct.? aiiky1 group. Examples of Cv? alkylthio groups include, but are not limited to,
-SCHa and -SCH2CH:J.
Disulfide: -SS-R, wherein R is a disulfide substituent, for example, a Ch alky! group, a 0Ά,Άΰ heterocyciyi group, or a Cs,¾ ary! group, preferably a C1.7 aikyi group (also referred to herein as C ; aikyi disuiiide). Exampies of C1-7 aikyi disulfide groups include, but are not iimited to, -SSCH3 and -SSCH2CH3.
Su!fine (suifinyi sulfoxide): -S{=0)R, wherein R is a su!fine substituent, for example, a Ci,7 aikyi group, a C^e heterocyciyi group, or a Cs-sosr i group, preferably a C,.? aikyi group. Examples of sulfine groups include, but are not limited to, «S(«0)CH3 and -S(=0)CH2CH3. Sulfone (sulfony!): -S{=0)2R, wherein R is a su!fone substituent* for exampie, a C 7 alkyl group, a Ca-ao heterocyciyi group, or a Cs^ar l group, preferably a Ch alk ! group, Including, for example, a fSuorinated or perfluonnaied C-j.? alky] group. Examples of suffone groups include, but are not limited to, -S(=0)¾CH3 (methanesulfonyl, mesyl), -S(=0)2CF3 (triflyl), -S{0)aCHaCH3 (esyl), -S{=0)2¾Fi> (nonafiyi), -S(=0)2CH2CF3 (tresyl), -S(=0)2CH2CH2NH2 (tauryl), -8(=0);·Ρη (phenylsuifonyi, besyl), 4-methylphenylsulfonyl (tosyl),
4-chloropheny!suffony! (closyS), 4-bromophenyisulfonyl (brosyl), 4-nitrophenyl (nosyl), 2-naphthalenesuifonate (rsapsyi), and 5-dimethylamino-naphthalen-1-ylsulfonate (dansyl).
Sulfinic acid (sulfino): -S(=0)OH, -S02H.
Sulfonic acid (sulfo): -S(=0)2OH, -S03H. Sulfinate (sulfinic acid ester); -S(=0}OR; wherein R is a sulfinate substituent, for exampie, a C^ aikyl group, a 03.¾ heterocyclyi group, or s Cs.20aryi group, preferably a C^ aiky! group. Examples of sulfinate groups include, but are not limited to, -S(=0)OCH3 (methoxysulfinyl; methyl sulfinate) and -S{=0)OCH:2CH3 ethoxysulfinyl; ethyl sulfinate). Sulfonate (sulfonic acid ester): -S(~0)? . ( wherein R is a sulfonate substituent, for exampie, a Ci j aikyi group, a 03.2Ϋ heierocyciyi group, or a Cs.a>aryf group, preferably a Ct..? alkyl group. Examples of sulfonate groups include, but are not limited to, -S{=0)2OCH3
(methoxysulfonyl; methyl sulfonate) and -S(=0)2OCH2CH3 (ethoxysulfonyi; ethyl sulfonate). Sulfinyloxy: -OS(=0)R, wherein R is a sulfinyloxy substituent, for example, a Ci_7 alkyl group, a C3.i0 heierocyciyi group, or a Cs.soaryl group, preferably a Ch alky! group. Examples of" su!fsnyioxy groups include, but are not limited to, ~OS(-0)CH3 and -OS^OJCHaCHa.
Sulfony!oxy; -OS(=0)2R, wherein R is a suifonyioxy substituent, for exampie, a d^ alkyi group, a C ¾ heterocyciyi group, or a C&^ aryl group, preferably a C¾.? alkyl group.
Examples of sutfonyioxy groups include, but are not iimtted to, -OS(=0)2CH3 (mesylate) and -OS(=0)2CH2CH3 (esylate).
Sulfate: -OS(=0)3OR wherein R is a sulfate substituent, for example, a Ct.r alkyl group, a C3.20 heterocyciyi group, or a€-,.;··. ary; group, preferably a Ci.? alkyl group. Examples of suifate groups include, but are not limited to, -08(=0)200Η3 and -SG(=0)2QCH2CH¾, Sulfamyl (sulfamoyi; sulfinic acid amide; sulfinamide); -S{=0)NR.',Rs, wherein R1 and R2 are independently amino substituents, as defined for amino groups. Examples of sulfamyl groups include, but are not limited to, -S(=0)NH2, -S(«0)NH(CH3), ~S(=0)N(CH3)2,
-S(=0)NH(CH2CH3), -S(=0)N(CH2CH3)2, and -S<=0)NHPh.
Sulfonamido (sulfinamoyl; sulfonic acid amide; sulfonamide): -S(=0)aNR1R2, wherein R and R2 are independently amino substituents, as defined for amino groups. Examples of sulfonamido groups include, but are not limited to, -3(=0)2ΝΗ2, -S(<%NHiCH3),
-S(=0)2N(CH3)2, -S(=0)2NH(CH2CH3), -S(=0)2N(CH2CH3)2, and -S(=0)2NHPh.
Sulfamino: -NR1S{=0}2OH, wherein R1 is an amino substituent, as defined for amino groups. Examples of sulfamino groups include, but are not limited to, -NHS(=0)2OH and
-N(CH3)S(=0)2OH.
Sulfonamino: -NR1S(=0)2R, wherein R1 is an amino substituent, as defined for amino groups, and R is a sulfonamino substituent, for example, a C r alkyl group, a C3.20 heterocyclyl group, or a C5_20 aryl group, preferably a C h alky! group. Examples of sulfonamino groups include, but are not limited to, -NHS(=0)2CH3 and -N(CH3)S(=0)2C6H5.
Sulfinamino: -NR S(=0)R, wherein R is an amino substituent, as defined for amino groups, and R is a sulfinamino substituent, for example, a C< v aikyi group, a C?,.¾£> heterocyclyl group, or a Cf.,x; aryi group, preferably a Ci-7 alkyl group. Examples of sulfinamino groups include, but are not limited to, -NHS(«0)CH3 and
Figure imgf000056_0001
Phosphino (phosphine): -PR2, wherein R is a p osphino substituent, for example, -H, a C 7 alkyl group, a C3,¾:. heterocyclyl group, or a C$.2Qary1 group, preferably -H, a Ch alky! group, or a C^ar ! group. Examples of phosphino groups include, but are not limited to, -PH2, -P(CH3)2, -P(CH2CH3)2, -P(t-Bu)2, and -P(Ph)2.
Phospho: -P(=0)2.
Phosphinyl (phosphine oxide): -P(=0)R2, wherein R is a phosphinyl substituent, for example, a Cv7 alk l group, a C - heterocyclyl group, or a C ··...¾ aryi group, preferably a Cw alkyl group or a C5.20 ar i group. Examples of phosphinyl groups include, but are not limited to, -P<«0)(CH3)2, -P{«0)(CH2CH¾)2, -P(=0)(t-8u)¾ and -P(«0)(P )2. Phosphonic acid (phosphono): -P(=0)(OH)2.
Phosphonate (phosphono ester); -P(=0)(OR)2, where R is a phosphonate substituent, for example, -H, a Ci.7 afkyl group, a C^ heterocyclyl group, or a C5_20 aryl group, preferably -H, a Ci.ralky! group, or a Cg^ aryJ group. Examples of phosphonate groups include, but are not limited to,
Figure imgf000057_0001
-P(=0)(0-t-Bu)2, and -P(=0)(OPh)2.
Phosphoric acid (phosphonooxy): -OP(=0)(OH)2.
Phosphate (phosphonooxy ester): ~OP(=0)(OR)2, where R is a phosphate substituent, for example, -H, a Cr.7 aikyl group, a C3,20 heterocyclyl group, or a C^ ar ! group, preferably -H, a Ch alky! group, or a C^ ary! group, examples of phosphate groups include, but are not limited to, -OP(=0)(OCH3)2, -OP(=0)(OCH2CH3)2, -OP(=0)(0-t-Bu)2, and -OP(=0)(OPh)2.
Phosphorous acid: -OP(OH)2.
Phosphite: -OP(OR)2, where R is a phosphite substituent, for example, -H, a C^ alkyl group, a C3.20 heterocyclyl group, or a C^aryl group, preferably -H, a C : a!kyl group, or a C¾¾>aryl group. Examples of phosphite groups include, but are not limited to, -ΟΡ(ΟΟΗ3)ϊ:
-OPiOCHjCHsh, -OP(0-i-Bu)a.. and -OP OP )2.
Phosphoramidite: -OP(OR'?)-NR? 2l where R1 and R2 are prtosphoramidite substituents, for example, -H, a (optionally substituted) Ot.? alkyl group, a Cg.2e heterocycty! group, or a <¾..¾! aryl group, preferably -H, a Ci-7 alkyl group, or a C5.20 aryl group. Examples of
phosphoramidite groups include, but are not limited to, -OP(OCH2CH3)-N(CH3)2,
.OP(OCH2CH3)-N(1-Pr)2, and -OP(OCH2CH2CN)-N(i-Pr)2.
Phosphoramidate: -OP(s50)(OR1)-NR23. where R1 and R2 are phosphoramidate substituents, for example, -H, a optionally substituted) cv7 alkyl group, a (¾.¾> heterocyclyl group, or a C§-2o aryl group, preferably -H, a C^r alkyl group, or a 05.20 aryl group. Examples of phosphoramidate groups include, but are not limited to, -OP(=0)(OCH2CH3)-N(CH3)2, -OP(=0)(OCH2CH3)-N(i-Pr)a, and -OP{=0){OCH2CH2CN)-N(i-Pr)2. Alkylene
(¼Μ2 alkylene; The term *C3.12 aikylene*. as used herein, pertains to a bidentate moiety obtained by* removing two hydrogen atoms, either both from the same carbon atom, or one from each of two different carbon atoms, of a hydrocarbon compound having from 3 to 12 carbon atoms (unless otherwise specified), which may be a!iphatic or alicyclic, and which may be saturated, partially unsaturated, or fully unsaturated. Thus, the term "aikyiene" includes the sub-classes afkenylene, alkynylene, cycioalkyiene, etc., discussed below.
Examples of linear saturated C aikyiene groups include, but are not limited to, -(CH2)n- where n is an integer from 3 to 12, for example, -CH2CH2CH2- (propylene),
-CH2CH2CH2CH2- (butylene), -CH2CH2CH2CH2CH2- (pentylene) and -CH2CH2CH2CH- 2CH2CH2CH2- (heptylene).
Examples of branched saturated C ¾. ·,;:· a!kyiene groups include, but are not limited to, -CH(CH3)CHr, -CH(CH3)CH2CHr . -CH(CH3)CH2CH2CH2-, -CH2CH(CH3)CH2-,
-CH2CH(CH3)CH2CH2-, -CH(CH2CH3)-, -CH{CH2CH3)CH2-, and -CH2CH(CH2CH3)CH2-.
Examples of linear partially unsaturated C3_12 alkylene groups (C3_12 alkenylene, and alkynylene groups) include, but are not limited to, -CH=CH-CH2-, -CH2-CH=CH2-,
-CH=CH-CH2-CH2-, -CH=CH-CH2-CH2-CH2-, -CH=CH-CH=CH-, -CH=CH-CH=CH-CH2-, - CH=CH-CH=CH-CH2-CH2-, -CH=CH-CH2-CH=CH-, -CH=CH-CH2-CH2-CH=CH-, and -CH2- C≡C-CH2-.
Examples of branched partially unsaturated C3.12 alkylene groups (C3- 2 alkenylene and alkynylene groups) include, but are not limited to, -C(CH3)=CH-, -C(CH3)=CH-CH2-,
-CH=CH-CH{CH3)- and -CHC-CH(CH;i)-,
Examples of a!icyciic saturated Cs.s2 aiky!ene groups (C3_i2 cycloalkylenes) include, but are not limited to, cyclopentylene (e.g. cyclopent-1 ,3-ylene), and cyclohexylene
(e.g. cyclohex-1 ,4-ylene).
Examples of alicyclic partially unsaturated C3- 2 alkylene groups (C3-12 cycloalkylenes) include, but are not limited to, cyclopentenylene (e.g. 4-cyclopenten-1 ,3-ylene), cyciohexenyiene (e.g. 2-cyclohexen-1 ,4-ylene; 3-cyclohexen-1 ,2-ylene; 2,5-cyclohexadien- 1 ,4-ylene). Includes Other Forms
Unless otherwise specified, included in the above are the well known ionic, salt, solvate, and protected forms of these substituents. For example, a reference to carboxyfie acid (-COOH) also includes the anionic (carboxyiate) form (-COO ), a salt or solvate thereof, as well as conventional protected forms. Similarly, a reference to an amino group includes the protonated form (-N+HR1R2), a salt or solvate of the amino group, for example, a hydrochloride salt, as well as conventional protected forms of an amino group. Similarly, a reference to a hydroxyl group also includes the anionic form {-O"), a salt or solvate thereof, as well as conventional protected forms.
Salts
It may be convenient or desirable to prepare, purify, and/or handle a corresponding salt of the active compound, for example, a pharmaceutically-acceptable salt. Examples of pharmaceutically acceptable salts are discussed in Berge, er a/., J. Pharm. Sci., 66, 1-19 (1977).
For example, if the compound is anionic, or has a functional group which may be anionic (e.g. -COOH may be -COO"), then a salt may be formed with a suitable cation. Examples of suitable inorganic cations include, but are not limited to, alkali metal ions such as Na+ and K'\ alkaline earth cations such as Ca2* and Mg2\ and other cations such as ΑΓ3. Examples of suitable organic cations include, but are not limited to, ammonium ion (i.e. NH4 +) and substituted ammonium ions {e.g. NH3R÷, NH2Ra ÷, NHR3\ NfV). Examples of some suitable substituted ammonium ions are those derived from: ethy!amine, dtethylamine,
dscyciohexy!amine, triethyiamine, butylamine, ethy!enediamine, ethano!amine,
diethanolamine, piperazine, benzylamine, phenylbenzylamine, choline, meglumine, and tromet amine, as well as amino acids, such as lysine and arginine. An example of a common quaternary ammonium ion is N{CH?,) . if the compound is cationic, or has a functional grou which may be cationic (e.g. -NHS may be -NH3*)« then a salt may be formed with a suitable anion. Examples of suitable tnorganic anions include, but are not limited to, those derived from the following inorganic acids: hydrochloric, hydrobromic, hydroiodic, sulfuric, sulfurous, nitric, nitrous, phosphoric, and phosphorous. Examples of suitable organic anions include, but are not limited to, those derived from the following organic acids: 2-acetyoxybenzoic, acetic, ascorbic, aspartic, benzoic, camphorsulfonic, cinnamic, citric, edetic, ethanedisulfonic, ethanesulfonic, fumaric, glucheptonic, gluconic, glutamic, glycolic, hydroxymaleic, hydroxynaphthalene carboxylic, isethionic, lactic, lactobionic, lauric, maleic, malic, methanesulfonic, mucic, oleic, oxalic, palmitic, pamoic, pantothenic, phenylacetic, phenylsulfonic, propionic, pyruvic, salicylic, stearic, succinic, sulfanilic, tartaric, toluenesulfonic, trifluoroacetic acid and valeric.
Examples of suitable polymeric organic anions include, but are not limited to, those derived from the following polymeric acids: tannic acid, carboxymethyl cellulose.
Solvates
It may be convenient or desirable to prepare, purify, and/or handle a corresponding solvate of the active compound. The term "solvate" is used herein in the conventional sense to refer to a compSex of solute (e.g. active compound, salt of active compound) and solvent. If the solvent is water, the solvate may be conveniently referred to as a hydrate, for example, a mono-hydrate, a di-hydrate, a tri-hydrate, etc.
The invention includes compounds where a solvent adds across the imine bond of the PBD moiety, which is illustrated below where the solvent is water or an alcohol (RAOH, where RA is C: alkyt):
Figure imgf000060_0001
These forms can be called the carbinolamine and carbinolamine ether forms of the PBD {as described in the section relating to R 0 above). The balance of these equilibria depend on the conditions in which the compounds are found, as well as the nature of the moiety itself.
These particular compounds may be isolated in solid form, for example, by lyophilisation.
Isomers
Certain compounds of the invention may exist in one or more particular geometric, optical, enantiomeric, diasteriomeric, epimeric, atropic, stereoisomeric, tautomeric, conformational, or anomeric forms, including but not limited to, cis- and trans-forms; E- and Z-forms; c-, t-, and r- forms; endo- and exo-forms; R-, S-, and meso-forms; D- and L-forms; d- and l-forms; (+) and (-) forms; keto-, enol-, and enolate-forms; syn- and anti-forms; synclinal- and anticlinal-forms; a- and β-forms; axial and equatorial forms; boat-, chair-, twist-, envelope-, and halfchair-forms; and combinations thereof, hereinafter collectively referred to as "isomers" (or "isomeric forms").
The term "chiral" refers to molecules which have the property of non-superimposability of the mirror image partner, while the term "achiral" refers to molecules which are superimposable on their mirror image partner.
The term "stereoisomers" refers to compounds which have identical chemical constitution, but differ with regard to the arrangement of the atoms or groups in space.
"Diastereomer" refers to a stereoisomer with two or more centers of chirality and whose molecules are not mirror images of one another. Diastereomers have different physical properties, e.g. melting points, boiling points, spectral properties, and reactivities. Mixtures of diastereomers may separate under high resolution analytical procedures such as electrophoresis and chromatography.
"Enantiomers" refer to two stereoisomers of a compound which are non-superimposable mirror images of one another. Stereochemical definitions and conventions used herein generally follow S. P. Parker, Ed., McGraw-Hill Dictionary of Chemical Terms (1984) McGraw-Hill Book Company, New York; and Eiiel, E, and Wiien, S.. "Stereochemistr of Organic Compounds", John Wiley & Sons, inc., New York, 1 S94. The compounds of the invention may contain asymmetric or chirai centers, and therefore exist in different stereoisomer^ forms. It is intended that aS! stereoisomeric forms of the compounds of the invention, including but not limited to, diastereomers, enantiomers and atropisomers, as well as mixtures thereof such as racemic mixtures, form part of the present invention. Many organic compounds exist in optically active forms, i.e., they have th ability to rotate the plane of plane-polarized light. In describing an optically active compound, the prefixes D and L, or R and S, are used to denote the absolute configuration of the molecule about its chiral center{s). The prefixes d and I or (+) and (-) are employed to designate the sign of rotation of plane-polarized light by the compound, with (-) or I meaning that the compound is levorotatory. A compound prefixed with (+) or d is dextrorotatory. For a given chemical structure, these stereoisomers are identica! except that they are mirror images of one another. A specific stereoisomer may also be referred to as an enantiomer, and a mixture of such isomers is often called an enantiomeric mixture. A 50:50 mixture of enantiomers is referred to as a racemic mixture or a racemate, which may occur where there has been no stereoselection or stereospecificity in a chemical reaction or process. The terms "racemic mixture" and "racemate" refer to an equimolar mixture of two enantiomeric species, devoid of optical activity.
Note that, except as discussed below for tautomeric forms, specifically excluded from the term "isomers", as used herein, are structural (or constitutional) isomers (i.e. isomers which differ in the connections between atoms rather than mereiy by the position of atoms in space). For example, a reference to a methoxy group, -OCH¾ is not to be construed as a reference to its structural isomer, a hydroxymethyl group, -CH2OH. Similarly, a reference to ort o-chlorophenyi is not to be construed as a reference to its structural isomer, meta- eniorophenyi. However, a reference to a class of structures may well include structurally isomeric forms failing within that ciass (e.g. C^alkyl includes n-propyl and iso-propyl; butyl includes n~, iso-, sec-, and tert-butyl; methoxyphenyl includes ortho-, meta-, and para- methoxypheny!).
The above exclusion does not pertain to tautomeric forms, for example, keto-, enol-, and enolate-forms, as in, for example, the following tautomeric pairs: keto/enol (illustrated below), imine/enamine, ami.de/imino alcohol, amidine/amidine, nitroso/oxime,
thioketone/enethioi, N-nitroso/hyroxyazo, and nitro/aci-nitro.
Figure imgf000062_0001
keto enol enolate
The term "tautomer" or "tautomeric form" refers to structural isomers of different energies which are interconvertible via a iow energy barrier. For example, proton tautomers (also known as prototropic tautomers) include interconversions via migration of a proton, such as keto-enol and imine-enamine isomerizations. Valence tautomers include interconversions by reorganization of some of the bonding electrons.
Note that specifically included in the term "isomer" are compounds with one or more isotopic substitutions. For example, H may be in any isoiopic form, including ¼ 3H (D), and sH (T); C may be in any isotopic form, including 2C, 13C, and C; O may be in any Isotopic form, including 160 and 80; and the like. Examples of isotopes that can be incorporated into compounds of the invention include isotopes of hydrogen, carbon, nitrogen, oxygen, phosphorous, fluorine, and chlorine, such as, but not limited to *H (deuterium, D), 3H (tritium), 11C, 3C, t C, 15N, !SF, 31 P, 3aP, 3SS, CI, and t2b\. Various isotopicaliy labeled compounds of the present invention, for example those into which radioactive isotopes such as 3H, 13C, and 14C are incorporated. Such isotopicaliy labelled compounds may be useful in metabolic studies, reaction kinetic studies, detection or imaging techniques, such as positron emission tomography (PET) or single- photon emission computed tomography (SPECT) including drug or substrate tissue distribution assays, or in radioactive treatment of patients. Deuterium labelled or substituted therapeutic compounds of the invention may have improved D PK (drug metabolism and pharmacokinetics) properties, relating to distribution., metabolism, and excretion ADME). Substitution with heavier isotopes such as deuterium may afford certain therapeutic advantages resulting from greater metabolic stability, for example increased in vivo half-life or reduced dosage requirements. An 1SF labeled compound may be useful for PET or SPECT studies, isotopicaliy labeled compounds of this invention and prodrugs thereof can generally be prepared by carrying out the procedures disclosed in the schemes or in the examples and preparations described below by substituting a readily available isotopicaliy labeled reagent for a non-tsotopical!y labeled reagent. Further, substitution with heavier isotopes, particularly deuterium (i.e., 2H or D) may afford certain therapeutic advantages resulting from greater metabolic stability, for example increased in vivo half-life or reduced dosage requirement or an improvement in therapeutic index. It is understood that deuterium in this context is regarded as a substituent. The concentration of such a heavier isotope, specifically deuterium, may be defined by an isotopic enrichment factor. In the compounds of this invention any atom not specifically designated as a particular isotope is meant to represent any stable isotope of that atom.
Unless otherwise specified, a reference to a particular compound includes all such isomeric forms, including (wholly or partially) racemic and other mixtures thereof. Methods for the preparation (e.g. asymmetric synthesis) and separation (e.g. fractional crystallisation and chromatographic means) of such isomeric forms are either known in the art or are readily obtained by adapting the methods taught herein, or known methods, in a known manner.
Figure imgf000063_0001
Generally, the cytotoxic or cytostatic activity of an antibody-drug conjugate (ADC) is measured by: exposing mammalian cells having receptor proteins, e.g. HE 2, to the antibody of the ADC in a cell culture medium; culturing the cells for a period from about 6 hours to about 5 days; and measuring ceil viability. Cell-based in vitro assays are used to measure viability {proliferation), cytotoxicity, and induction of apoptosis (caspase activation) of an ADC of the invention.
The in vita potency of aniibody-drug conjugates can be measured by a cell proliferation assay. The CeliTfter-Gio® Luminescent Ce!! Viability Assay is a commercially available {Promega Corp., Madison, i), homogeneous assay method based on the recombinant expression of Coteopte iuciferase (US Patent Nos. 5583024; 5674713 and 5700670). This ceil proliferation assay determines the number of viable cells in culture based on quantitation of the ATP present, an indicator of metaboiicaly active ceils (Crouch et a! (1993) J. Immunol, Meth. 160:81-88; US 6602677). The CeilTiter-G!o® Assay is conducted in 96 wet! format, making it amenable to automated high-throughput screening (HTS (Cree et at {1996) Anticancer Drugs 6; 398-404 ), The homogeneous assay procedure involves adding the single reagent (GeilTiter-Gio® Reagent) directly to cells cultured in serum-supplemented medium. Cell washing, removal of medium and multiple pipetting steps are not required. The system detects as few as 15 ceiis/wei! in a 384-weli formal in 10 minutes after adding reagent and mixing. The ceils may be treated continuousiy with ADC, or they may be treated and separated from ADC. Generally, ceils treated briefly, i.e. 3 hours, showed the same potency effects as continuously treated cells.
The homogeneous "add-mix-measure" format results in ce!i lysis and generation of a luminescent signal proportional to the amount of ATP present. The amount of ATP is directly proportional to the number of cells present in culture. The CeliTiter-G!o® Assay generates a "glow-type" luminescent signal, produced by the Iuciferase reaction, which has a half-life generally greater than five hours, depending on ceil type and medium used. Viable ceiis are reflected in relative luminescence units (RLU). The substrate. Beetle Lucifenn, is oxidatively decarboxylated by recombinant firefly Iuciferase with concomitant conversion of ATP to AMP and generation of photons.
In vivo efficacy
The in vivo efficacy of antibody-drug conjugates (ADC) of the invention can be measured by tumor xenograft studies in mice. For example, the in vivo efficacy of an anti-HER2 ADC of the invention can be measured by a high expressing HERS transgenic expiant 'mouse model. An allograft is propagated from the Fo5 mmtv transgenic mouse which does not respond to, or responds poorly to, HERCEPTIN® therapy. Subjects were treated once with ADC at certain dose levels (mg/kg) and PBD drug exposure ( g/m2); and placebo buffer control (Vehicle) and monitored over two weeks or more to measure the time to tumor doubling, log cell kill, and tumor shrinkage. Use
The conjugates of the invention may be used to provide a PBD compound at a target location.
The target location is preferably a proliferative cell population. The antibody is an antibody for an antigen present in a proliferative cell population.
In one embodiment the antigen is absent or present at a reduced level in a non-proliferative cell population compared to the amount of antigen present in the proliferative cell population, for example a tumour cell popuiation.
At the target location the Sinker may be cleaved so as to release a compound of formulae B or C Thus, the conjugate may be used to selectively provide a compound of formulae B or C to the target location. The linker may be cleaved by an enzyme present at the target location.
The target location may be in vitro, in vivo or &x vivo.
The antibody-drug conjugate (ADC) compounds of the invention include those with utility for anticancer activity, in particular, the compounds include an antibody conjugated, i.e.
eovaiently attached b a linker, to a PBD drug moiety, i.e. toxin. When the drug is not conjugated to an antibody, the PBD drug has a cytotoxic effect. The biological activity of the PBD drug moiety is thus modulated by conjugation to an antibody. The antibody-drug conjugates (ADC) of the invention selectively deliver an effective dose of a cytotoxic agent to tumor tissue whereby greater selectivity, i.e. a lower efficacious dose, may be achieved.
Thus, in one aspect, the present invention provides a conjugate compound as described herein for use in therapy.
In a further aspect there is also provides a conjugate compound as described herein for use in the treatment of a proliferative disease. A second aspect of the present invention provides the use of a conjugate compound in the manufacture of a medicament for treating a proliferative disease.
One of ordinary skill in the art is readily able to determine whether or not a candidate conjugate treats a proliferative condition for any particular cell type. For example, assays which may conveniently be used to assess the activity offered by a particular compound are described in the examples below.
The term "proliferative disease" pertains to an unwanted or uncontrolled cellular proliferation of excessive or abnormal cells which is undesired, such as, neoplastic or hyperplastic growth, whether in vitro or in vivo.
Examples of proliferative conditions i-nciude, but are not limited to, benign, pre-malignant, and malignant ceiluiar proliferation, including but not limited to, neoplasms and tumours (e.g. histocytoma, glioma, asirocyoma, osteoma), cancers (e.g. lung cancer, small cell lung cancer, gastrointestinal cancer, bowel cancer, colon cancer, breast carinoma, ovarian carcinoma, prostate cancer, testicular cancer, liver cancer, kidney cancer, bladder cancer, pancreas cancer, brain cancer, sarcoma, osteosarcoma, Kaposi's sarcoma, melanoma), leukemias, psoriasis, bone diseases, fibroproliferative disorders (e.g. of connective tissues), and atherosclerosis. Cancers of particular interest include, but are not limited to, leukemias and ovarian cancers.
Any type of ceil may be treated, including but not limited to, lung, gastrointestinal (including, e.g. bowel colon), breast (mammary), ovarian, prostate, liver (hepatic), kidney (renal), bladder, pancreas, brain, and skin.
In one embodiment, the treatment is of a pancreatic cancer.
In one embodiment, the treatment is of a tumour having ανβ6 integrin on the surface of the cell.
It is contemplated that the antibody-drug conjugates (ADC) of the present invention may be used to treat various diseases or disorders, e.g. characterized by the overexpression of a tumor antigen. Exemplary conditions or hyperproliferative disorders include benign or malignant tumors; leukemia, haematological, and lymphoid malignancies. Others include neuronal, glial, astrocytes, hypothalamic, glandular, macrophagal, epithelial, stromal, biastocoe!ic. inflammatory, angiogenic and immunologic, including autoimmune, disorders. Generally, the disease or disorder to be treated is a hyperpro!sferative disease suc as cancer. Examples of cancer to be treated herein include, but are not limited to, carcinoma, lymphoma, blastoma, sarcoma, and leukemia or lymphoid malignancies. More particular examples of such cancers include squamous cell cancer {e.g. epithelial squamous cell cancer), lung cancer including small-cell lung cancer, non-small cell lung cancer, adenocarcinoma of the lung and squamous carcinoma of the lung, cancer of the peritoneum, hepatocellular cancer, gastric or stomach cancer including gastrointestinal cancer, pancreatic cancer, glioblastoma, cervical cancer, ovarian cancer, liver cancer, bladder cancer, hepatoma, breast cancer, colon cancer, rectal cancer, colorectal cancer, endometrial or uterine carcinoma, salivary gland carcinoma, kidney or renal cancer, prostate cancer, vulval cancer, thyroid cancer, hepatic carcinoma, anal carcinoma, penile carcinoma, as well as head and neck cancer. Autoimmune diseases for which the ADC compounds may be used in treatment include rheun atologic disorders (such as, for example, rheumatoid arthritis, Sjogren's syndrome, scleroderma, lupus such as SLE and lupus nephritis, polymyositis/dermatomyositis, cryoglobulinemia, anti-phospholipid antibody syndrome, and psoriatic arthritis), osteoarthritis, autoimmune gastrointestinal and liver disorders (such as, for example, inflammatory bowel diseases (e.g. ulcerative colitis and Crohn's disease), autoimmune gastritis and pernicious anemia, autoimmune hepatitis, primary biliary cirrhosis, primary sclerosing cholangitis, and celiac disease), vasculitis {such as, for example, ANCA-associated vasculitis, including Ghurg-Strauss vasculitis, Wegener's granulomatosis, and polyarteriitis), autoimmune neurological disorders (such as, for example, multiple sclerosis, opsoclonus myoclonus syndrome, myasthenia gravis, neuromyelitis optica, Parkinson's disease, Alzheimer's disease, and autoimmune polyneuropathies), renal disorders (such as, for example, glomerulonephritis, Goodpasture's syndrome, and Berger's disease), autoimmune dermatologic disorders (such as, for example, psoriasis, urticaria, hives, pemphigus vulgaris, bullous pemphigoid, and cutaneous lupus erythematosus), hematologic disorders (such as, for example, thrombocytopenic purpura, thrombotic thrombocytopenic purpura, posttransfusion purpura, and autoimmune hemolytic anemia), atherosclerosis, uveitis, autoimmune hearing diseases (such as, for example, inner ear disease and hearing loss), Behcet's disease, Raynaud's syndrome, organ transplant, and autoimmune endocrine disorders (such as, for example, diabetic-related autoimmune diseases such as insulin- dependent diabetes meliitus (!DD ), Addison's disease, and autoimmune thyroid disease (e.g. Graves' disease and thyroiditis)). More preferred such diseases include, for example, rheumatoid arthritis, ulcerative colitis, A CA-associated vasculitis, lupus, multiple sclerosis, Sjogren's syndrome, Graves1 disease, IDDM, pernicious anemia, thyroiditis, and
glomerulonephritis. Methods of Treatment
The conjugates of the present invention may be used in a method of therapy. Also provided is a method of treatment, comprising administering to a subject in need of treatment a therapeutically-effective amount of a conjugate compound of the invention. The term "therapeutically effective amount" is an amount sufficient to show benefit to a patient. Such benefit may be at least amelioration of at least one symptom. The actual amount administered, and rate and time-course of administration, will depend on the nature and severity of what is being treated. Prescription of treatment, e.g. decisions on dosage, is within the responsibility of general practitioners and other medical doctors. A compound of the invention may be administered alone or in combination with other treatments, either simultaneously or sequeniially dependent upon the condition to be treated. Examples of treatments and therapies include, but are not limited to, chemotherapy (the administration of active agents, including, e.g. drugs, such as chemotherapeutics); surgery; and radiation therapy.
A "chemotherapeutic agent" is a chemical compound useful in the treatment of cancer, regardless of mechanism of action. Classes of chemotherapeutic agents include, but are not limited to; alkylating agents, antimetabolites, spindle poison plant alkaloids,
cytotoxic antitumor antibiotics, topoisomerase inhibitors, antibodies, photosensitizers, and kinase inhibitors. Chemotherapeutic agents include compounds used in "targeted therapy" and conventional chemotherapy.
Examples of chemotherapeutic agents include: erlotinib (TARCEVA®, Genentech/OSI Pharm.), docetaxei (TAXOTERE®, Sanofi-Aventis), 5-FU (fluorouracil, 5-fluorouracil, CAS No. 51-21-8), gemcftabine (GEMZAR®, Uliy), PD-0325901 (CAS No. 391210-10-9, Pfizer), cispiaiin (cis-diamine, dicihioropiaiinum(ll), CAS No. 15663-27-1 ), carbop!attn (CAS No. 41575-94-4), paciitaxe! (TAXOL®. Bristoi-Myers Squibb Oncology, Princeton, N.J.), trastuzumab (HERCEPTIN®, Genentech), temozolomide (4-methyi-5-oxo- 2,3,4,6,8- pentazabicyc!o [4.3.0] nona-2,7,9-triene- 9-carboxamide, CAS No. 85622-93-1,
TE QDAR®, TEMODAL®, Schenng Plough), tamoxifen ((Z}-2-[4-(1 ,2-diphenyIbuM- enyl)phenoxy]-W,/V-dimethylethanamine, NOLVADEX®, iSTUBAL®, VALODEX®), and doxorubicin (ADR!AMYC!N®), Akti-1/2, HPPD, and rapamycin.
More examples of chemoiherapeutic agents include: oxalip!aiin (ELOXAT!N®, Sanofi), bortezomib (VELCADE®, Millennium Pharm.), sutent {SUN!TiNIB®, 3011248, Pfizer), leirozole (FEMARA®, NGvartis), imaiinib mesylate (GIEEVEC®, Novartis), XL-518 (SVSek inhibitor, Exelixis, WO 2007/044515), ARRY-886 ( ek inhibitor, AZD6244, Array BioPharma, Astra Zeoeca), SF-1126 (P13K inhibitor, Semafore Pharmaceuticals), BEZ-235 (PI3K inhibitor, Novartis), XL-147 (PI3K inhibitor, Exelixis), PTK787/ZK 222584 {Novariis), fuivestrant (FASLODEX®, AstraZeneca), !eucovorin (fo!inic acid), rapamycin (sifoltmus, RAPAMUNE®, VVyeth), iapaiinib (TYKERB®, GSK572016, Glaxo Smith Kline), lonafarnib { SARAS AR™, SCH 66336, Severing Plough), sorafensb (NEXAVAR®, BAY43-9006, Bayer Labs), gefitinib (IRESSA®, AstraZeneca), irinotecan {CAMPTOSAR®, CPT-11 , Pfizer), tipifami (ZARNESTRA™, Johnson & Johnson), ABRAXANE™ {Cremophor-free), albumin- engineered nanoparticie formulations of paciitaxei (American Pharmaceutical Partners, Schaumberg, IS), vandetanib (riNN, 206474, ZACTIMA®, AstraZeneca), chloran faucil, AG1 78, AG1S71 (SU 5271 ; Sugen), temsirolimus (TQRISEL®, VVyeth), pazopanib
(G!axoSmi hKiine), canfosfamide (TELCYTA®, Telik), thiotepa and cyclosphosphamide (CYTOXAN®, NEGSAR®}; aiky! sulfonates such as busulfan, improsulfan and piposulfan; aziridines such as benzodopa, carboquone, meturedopa, and uredopa; ethylenimines and methylamelamines including altretamine, triethylenemelamine, triethylenephosphoramide, triethylenethiophosphoramide and trimethylomelamine; acetogenins (especially bullatacin and bullatacinone); a camptoihecsn {including the synthetic analog topotecan); bryostatin; caSiysiatin; CC-1065 (including its adozelesin, carzelesin and bizelesin synthetic analogs); crypiophycins (particularly cryptophycin 1 and cryptophycin 8); dolastatin; duocarmycin (including the synthetic analogs, KW-2189 and CB1-TM1 ); eleutherobin; pancratistatin; a sarcodictyin; spongistatin; nitrogen mustards such as chlorambucil, chlornaphazine, chlorophosphamide, estramustine, ifosfamide, mechlorethamine, mechlorethamine oxide hydrochloride, melphalan, novembichin, phenesterine, prednimustine, trofosfamide, uracil mustard; nitrosoureas such as carmustine, chlorozotocin, fotemusttne, !omustine, nimustine, and ranimnustine; antibiotics such as the enediyne antibiotics {e.g. caiieheamicin, calicheamicin gamma 11, caiieheamicin omega! 1 {Angew Chew. Mi. Ed. Engt. (1994) 33:183-186); dynemicin, dynemicin A; bisphosphonates, such as clodronate; an
esperamicin: as vveil as neocarzinostatin chromophore and related chromoprotein enediyne antibiotic chromophores), aciacinomysins, actinomycin, authramycin, azaserine, bleomycins, cactinomycin, carabicin, carminomycin, carzinophilin, chromomycinis, dactinomycin, daunorubicin, detorubicin, 6-diazo-5-oxo-L-norleucine, morpholino-doxorubicin, cyanomorpholino-doxorubicin, 2-pyrrolino-doxorubicin and deoxydoxorubicin), epirubicin, esorubicin, idarubicin, nemorubicin, marcellomycin, mitomycins such as mitomycin C, mycophenolic acid, nogalamycin, olivomycins, peplomycin, porfiromycin, puromycin, quelamycin, rodorubicin, streptonigrin, streptozocin, tubercidin, ubenimex, zinostatin, zorubicin; anti-metabolites such as methotrexate and 5-fluorouracil (5-FU); folic acid analogs such as denopterin, methotrexate, pteropterin, trimetrexate; purine analogs such as fludarabine, 6-mercaptopurine, thiamiprine, thioguanine; pyrimidine analogs such as ancitabine, azacitidine, 6-azauridine, carmofur, cytarabine, dideoxyuridine, doxifluridine, enocitabine, floxuridine; androgens such as calusterone, dromostanolone propionate, epitiostanoi, mepitiostane, testoiactone; anti-adrenals such as aminoglutethimide, mitotane, trilostane; folic acid replenisher such as frolinic acid; aceglatone; aldophosphamide glycoside; aminolevulinic acid; eniluracil; amsacrine; bestrabucil; bisantrene; edatraxate; defofamine; demecolcine; diaziquone; elfornithine; elliptinium acetate; an epothilone;
etoglucid; gallium nitrate; hydroxyurea; lenttnan; lonidainine; maytansinoids such as maytansine and ansamiiocins; mitoguazone; mitoxantrone; mopidanmol; nitraerine;
pentostatin; phenamet; pirarubicin; iosoxantrone; podophyllinic acid; 2-ethylhydrazide; procarbazine; PSK# polysaccharide complex (JHS Natural Products, Eugene, OR);
razoxane; rhizoxin; sizofsran: spirogermanium; tenuazonic acid; triaziquone; 2,2',2"- trichiorotriethylamine; trichothecenes (especially T-2 toxin, verracurin A, roridin A and anguidine); urethan; vindesine; daearbazine; mannomustine; mitobronitol; mito!actoi;
pspobroman; gacytosine; arablnosltie ("Ara-C"}; cyclophosphamide; thtotepa; e-thioguanine; mercaptopurine; methotrexate; platinum analogs such as cisplatin and carboplatin;
vinblastine; eioposide (VP-16); ifosfamide; mitoxantrone; vincristine; vinorelbine
(NAVELBINE®); novantrone; teniposide; edatrexate; daunomycin; aminopterin; capecitabine (XELODA®, Roche); ibandronate; CPT-1 1 ; iopoisomerase inhibitor RFS 2000;
dif!uororneihyiornithtne (D FO); retinoids such as retinoic acid; and pharmaceutically acceptable salts, acids and derivatives of any of the above.
Aiso Included in the definition of "chemoiherapeutic agent" are: (i) anti-hormonal agents that act to regulate or inhibit hormone action on tumors such as anti-estrogens and selective estrogen receptor modulators (SERMs), including, for example, tamoxifen (including NOLVADEX®; tamoxifen citrate), raloxifene, {.raloxifene, 4-hydroxytamoxifen, rioxifene, keoxifene, LY1 17018, onapristone, and FARESTON® (toremifine citrate); (ii) aromatase inhibitors that inhibit the enzyme aromatase, which regulates estrogen production in the adrenal glands, such as, for example, 4{5}-imi a2oies, aminoglutethimide, MEGASE©
(megestrol acetate), AROMAS IN® (exemestane; Pfizer), formestanie, fadrozo!e, R{ ISOR® (vorozole), FEMARA® (letrozole; Novartis), and ARIMIDEX® (anastrozole; AstraZeneca); (Hi) anti-androgens such as fiutamide, ni!utamide, bica!utamide, !eupro!ide, and goserelin; as well as troxacltafoine (a 1 ,3-dioxolane nucleoside eytosine analog); (iv) protein kinase inhibitors such as MEK inhibitors (WO 2007/044515); (v) Sipid kinase inhibitors; (vi) antisense oligonucleotides, particularly those which inhibit expression of genes in signaling pathways implicated in aberrant cell proliferation, for example, PKC-alpha, Raf and H-Ras, such as ob!smersen (GENASENSE®, Genta inc.); (vii) ribozymes such as VEGF expression inhibitors (e.g., ANG'IOZYME®) and HER2 expression inhibitors; (viii) vaccines such as gene therapy vaccines, for example, ALLOVECTIN®, LEUVECT! ®, and VAXID®; PROLEUKIN® rlL-2; topoisomerase 1 inhibitors such as LURTOTECAN®; ABARELIX® rmRH; (ix) anti- angiogenic agents suc as bevacizumab (AVASTS ®, Genentech); and pharmaceutically acceptable salts, acids and derivatives of any of the above.
Also included in the definition of "chemotherapeuiic agent" are therapeutic antibodies such as aiemtuzumab (Campath), bevacizumab (AVAST! N®, Genentech); cetuximab
(ERB!TUX®, Imclone) panitumumab (VECTIBSX®, Amgen), rituximab (RSTUXAN®, Genentech/Biogen idee)., pertuzumab (OMNfTARG™, 2C4. Genentech), trastuzumab (HERCEPTSN®, Genentech), tositumomab (Bexxar, Corixia), and the antibody drug conjugate, gerntuzumab ozogamicsn '{MYLOTARG®, Wyeth). Humanized monoclonal antibodies with therapeutic potential as chemotherapeuiic agents in combination with the conjugates of the invention include: aiemtuzumab, apolizumab, aselizumab, atlizumab, bapineuzumab, bevacizumab, bivatuzumab mertansine, cantuzumab mertansine, cedelizumab, certolizumab pegol, cidfusituzumab, cidtuzumab, daclizumab, eculizumab, efalizumab, epratuzumab, erlizumab, felvizumab, fontolizumab, gerntuzumab ozogamicin, inotuzumab ozogamicin, ipilimumab, labetuzumab, lintuzumab, matuzumab, mepolizumab, motavizumab, motovizumab, natalizumab, nimotuzumab, nolovizumab, numavizumab, ocrelizumab, omalizumab, palivizumab, pascolizumab, pecfusituzumab, pectuzumab, pertuzumab, pexelizumab, ralivizumab, ranibizumab, reslivizumab, reslizumab, resyvizumab, rovelizumab, ruplizumab, sibrotuzumab, siplizumab, sontuzumab,
tacatuzumab tetraxetan, tadocizumab, talizumab, tefibazumab, tocilizumab, toralizumab, trastuzumab, tucotuzumab celmoleukin, tucusituzumab, umavizumab, urtoxazumab, and visilizumab.
Pharmaceutical compositions according to the present invention, and for use in accordance with the present invention, may comprise, in addition to the active ingredient, i.e. a conjugate compound, a pharmaceutically acceptable excipient, carrier, buffer, stabiliser or other materials well known to those skilled in the art. Such materials should be non-toxic and should not interfere with the efficacy of the active ingredient. The precise nature of the carrier or other material will depend on the route of administration, which may be oral, or by injection, e.g. cutaneous, subcutaneous, or intravenous.
Pharmaceutical compositions for oral administration may be in tablet, capsule, powder or liquid form, A tablet may comprise a solid carrier or an adjuvant. Liquid pharmaceutical compositions generally comprise a liquid carrier such as water, petroleum, animal or vegetable oils, mineral oil or synthetic oil. Physiological saline solution, dextrose or other saccharide solution or glycols such as ethylene glycol, propylene glycol or polyethylene glycol may be included. A capsule may comprise a solid carrier such a gelatin.
For intravenous, cutaneous or subcutaneous injection, or injection at the site of affliction, the active ingredient will be in the form of a parenteral^ acceptabie aqueous solution which is pyrogen-free and has suitable pH, isotonicity and stability. Those of relevant skill in the art are well able to prepare suitable solutions using, for example, isotonic vehicles such as Sodium Chloride Injection, Ringer's Injection, Laciated Ringer's Injection, Preservatives, stabilisers, buffers, antioxidants and/or other additives may be included, as required, Formulations
While it is possible for the conjugate compound to be used (e.g., administered) alone, it is often preferable to present it as a composition or formulation.
In one embodiment, the composition is a pharmaceutical composition (e.g., formulation, preparation, medicament) comprising a conjugate compound, as described herein, and a pharmaceutically acceptable carrier, diluent, or excipient.
In one embodiment, the composition is a pharmaceutical composition comprising at least one conjugate compound, as described herein, together with one or more other pharmaceutically acceptable ingredients well known to those skilled in the art, including, but not limited to, pharmaceutically acceptable carriers, diluents, excipients, adjuvants, fillers, buffers, preservatives, anii-oxidants, lubricants, stabilisers, solubilisers, surfactants (e.g., wetting agents}, masking agents, colouring agents, flavouring agents, and sweetening agents. In one embodiment, the composition further comprises other active agents, for example, other therapeutic or prophylactic agents.
Suitable carriers, diluents, excipients, etc. can be found in standard pharmaceutical texts. See, for example, Handbook of Pharmaceutical Additives. 2ήύ Edition (eds. M. Ash and I, Ash},. 2001 (Synapse Information Resources, Inc., Ertdicott, New York, USA), Remington's Pharmaceutical Sciences. 20th edition, pub. Lippincott, Williams & Wifkins, 2000; and
Handbook of Pharmaceutical Excipients, 2nd edition, 1994. Another aspect of the present invention pertains to methods of making a pharmaceutical composition comprising admixing at least one [15C]-radioiabelled conjugate or conjugate-like compound, as defined herein, together with one or more other pharmaceulicaily acceptable ingredients well known to those skilled in the art, e.g., carriers, diluents, excipients, etc, if formulated as discrete units (e.g., tablets, etc.), each unit contains a predetermined amount (dosage) of the active compound.
The term "pharmaceutically acceptable," as used herein, pertains to compounds, ingredients, materials, compositions, dosage forms, etc., which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of the subject in question (e.g., human) without excessive toxicity, irritation, allergic response, or other problem or complication, commensurate with a reasonable benefit/risk ratio. Each carrier, diluent, excipient, etc. must also be "acceptable" in the sense of being compatible with the other ingredients of the formulation. The formulations may be prepared by any methods well known in the art of pharmacy. Such methods include the step of bringing into association the active compound with a carrier which constitutes one or more accessory ingredients. In general, the formulations are prepared by uniformly and intimately bringing into association the active compound with carriers (e.g., liquid carriers, finely divided solid carrier, etc.), and then shaping the product, if necessary.
The formulation may be prepared to provide for rapid or slow release; immediate, delayed, timed, or sustained release; or a combination thereof. Formulations suitable for parenteral administration (e.g., by injection), include aqueous or non-aqueous, isotonic, pyrogen-free, sterile liquids (e.g., solutions, suspensions), in which the active ingredient is dissolved, suspended, or otherwise provided (e.g., in a liposome or other mrcroparticuiate). Such liquids may additional contain other pharmaceutically acceptable ingredients, such as anti-oxidants, buffers, preservatives, stabilisers, bacteriostats, suspending agents, thickening agents, and solutes which render the formulation isotonic with the blood (or other relevant bodily fluid) of the intended recipient. Examples of excipients include, for example, water, alcohols, polyols, glycerol, vegetable oiis, and the like. Examples of suitable isotonic carriers for use in such formulations include Sodium Chloride Injection, Ringer's. Solution, or Laciated Ringer's Injection. Typically, the concentration of the active ingredient in the liquid is from about 1 ng/mi to about 10 Mg mi, for example from about 10 ng/ml to about 1 pg/ml. The formulations may be presented in unit-dose or multi-dose sealed containers, for example, ampoules and vials, and may be stored in a freeze-dried (lyophilised) condition requiring only the addition of the sterile liquid carrier, for example water for injections, immediately prior to use. Extemporaneous injection solutions and suspensions ma be prepared from sterile powders, granules, and tablets.
Dasag&
It will be appreciated by one of skill in the art that appropriate dosages of the conjugate compound, and compositions comprising the conjugate compound, can vary from patient to patient. Determining the optimal dosage will generally involve the balancing of the level of therapeutic benefit against any risk or deleterious side effects. The selected dosage level wfii depend on a variety of factors including, but not limited to, the activity of the particular compound, the route of administration, the time of administration, the rate of excretion of the compound, the duration of the treatment, other drugs, compounds, and/or materials used in combination, the severity of the condition, and the species, sex, age, weight, condition, general health, and prior medical history of the patient. The amount of compound and route of administration will ultimately be at the discretion of the physician, veterinarian, or clinician, although generally the dosage will be selected to achieve local concentrations at the site of action which achieve the desired effect without causing substantial harmful or deleterious side-effects.
Administration can be effected in one dose, continuously or intermittently (e.g., in divided doses at appropriate intervals) throughout the course of treatment. Methods of determining the most effective means and dosage of administration are well known to those of skill in the art and will vary with the formulation used for therapy, the purpose of the therapy, the target ceii(s) being treated, and the subject being treated. Single or multiple administrations can be carried out with the dose level and pattern being selected by the treating physician, veterinarian, or clinician.
In general, a suitable dose of the active compound is in the range of about 100 ng to about 25 mg (more typically about 1 pg to about 10 mg) per kilogram body weight of the subject per day. Where the active compound is a salt, an ester, an amide, a prodrug, or the like, the amount administered is calculated on the basis of the parent compound and so the actual weight to be used is increased proportionately. In one embodiment, the active compound is administered to a human patient according to the following dosage regime: about 10Q mg, 3 times daily. in one embodiment, the active compound is administered to a human patient according to the following dosage regime; about 150 mg, 2 times daily. in one embodiment, the active compound is administered to a human patient according to the following dosage regime: about 200 mg, 2 times daily.
However in one embodiment, the conjugate compound is administered to a human patient according to the following dosage regime: about 50 or about 75 mg, 3 or 4 times daily.
In one embodiment, the conjugate compound is administered to a human patient according to the following dosage regime: about 100 or about 125 mg, 2 times daiiy, The dosage amounts described above may apply to the conjugate {including the PBD moiety and the linker to the antibody) or to the effective amount of PBD compound provided, for example the amount of compound that is releasable after cleavage of the linker.
For the prevention or treatment of disease, the appropriate dosage of an ADC of the invention will depend on the type of disease to be treated, as defined above, the severity and course of the disease, whether the molecule is administered for preventive or therapeutic purposes, previous therapy, the patient's clinical history and response to the antibody, and the discretion of the attending physician. The molecule is suitably
administered to the patient at one time or over a series of treatments. Depending on the type and severity of the disease, about 1 Mg/kg to 5 mg/kg (e.g. 0.1-20 mg/kg) of mofecule is an initiai candidate dosage for administration to the patient, whether, for example, by one or more separate administrations, or by continuous infusion. A typical daily dosage might range from about 1 g kg to 100 mg/kg or more, depending on the factors mentioned above. An exemplary dosage of ADC to be administered to a patient is in the range of about 0.1 to about 10 mg/kg of patient weight. For repeated administrations over several days or longer, depending on the condition, the treatment is sustained until a desired suppression of disease symptoms occurs. An exemplary dosing regimen comprises a course of administering an initial loading dose of about 4 mg/kg, followed by additional doses every week, two weeks, or three weeks of an ADG. Other dosage regimens may be useful. The progress of this therapy is easily monitored by conventional techniques and assays.
Treatment
The term "treatment,'1 as used herein in the context of treating a condition, pertains generally to treatment and therapy, whether of a human or an animal {e.g., in veterinary applications), in which some desired therapeutic effect is achieved, for example, the inhibition of the progress of the condition, and includes a reduction in the rate of progress, a halt in the rate of progress, regression of the condition, amelioration of the condition, and cure of the condition. Treatment as a prophylactic measure (i.e., prophylaxis, prevention) is also included. The term "therapeutically-effective amount," as used herein, pertains to that amount of an active compound, or a material, composition or dosage from comprising an active compound, which is effective for producing some desired therapeutic effect, commensurate with a reasonable benefit/risk ratio, when administered in accordance with a desired treatment regimen.
Similarly, the term "prophylactically-effective amount," as used herein, pertains to that amount of an active compound, or a material, composition or dosage from comprising an active compound, which is effective for producing some desired prophylactic effect, commensurate with a reasonable benefit/risk ratio, when administered in accordance with a desired treatment regimen.
Preparation of Antibody drug conjugates
Antibody drug conjugates may be prepared by several routes, employing organic chemistry reactions, conditions, and reagents known to those skilled in the art, including; (1 ) reaction of a nucieophiiic group of an antibody with a bivalent linker reagent, to form antibody-!inker intermediate Ab-L, via a covaient bond, followed by reaction with an activated drug moiety reagent ; and (2) reaction of a drug moiety reagent with a linker reagent, to form drug-linker reagent D~L, via a covaient bond, followed by reaction with the nucleophilic of an antibody. Conjugation methods (1) and (2) may be employed with a variety of antibodies, and linkers to prepare the antibody-drug conjugates of the invention.
Nucleophilic groups on antibodies include, but are not limited to side chain thiol groups, e.g. cysteine. Thiol groups are nucleophilic and capable of reacting to form covaient bonds with electrophilic groups on linker moieties such as those of the present invention. Certain antibodies have reducible interchain disulfides, i.e. cysteine bridges. Antibodies may be made reactive for conjugation with linker reagents by treatment with a reducing agent such as DTT (Cfeian 's reagent, dithiothreitoi) or TCEP {iris{2-carboxyethyi)phQsphine hydrochloride; Getz ei a! (1999) Anal. Biochem. Vol 273:73-80; Soitec Ventures, Beverly, MA), Each cysteine disulfide bridge will thus form, theoreticaily, two reactive thiol nuc!eophiies. Additional nudeophiiic groups can be introduced into antibodies through the reaction of lysines with 2~iminothioiane (Traut's reagent) resulting in conversion of an amine info a thiol
The Subject/Patient
The subject patient may be an animal, mammal, a placental mammal, a marsupial
(e.g., kangaroo, wombat), a monotreme (e.g., duckbilled platypus), a rodent (e.g., a guinea pig, a hamster, a rat, a mouse), murine (e.g., a mouse), a lagomorph (e.g., a rabbit), avian {e.g., a bird), canine (e.g., a dog), feline (e.g., a cat), equine (e.g., a horse), porcine (e.g., a pig), ovine (e.g., a sheep), bovine (e.g., a cow), a primate, simian (e.g., a monkey or ape), a monkey (e.g., marmoset, baboon), an ape (e.g., gorilla, chimpanzee, orangutang, gibbon), or a human.
Furthermore, the subject/patient may be any of its forms of development, for example, a foetus. In one preferred embodiment, the subject/patient is a human. In one embodiment, the patient is a population where each patient has a tumour having avps integrin on the surface of the cell.
Figure imgf000078_0001
Figure imgf000078_0002
(f) Ester reduction (ii) SiSyi protection (ffi) Nitro reduction
5
Figure imgf000078_0003
V!
(!) Silyl deprotection {ii} Cyclisation
T
Figure imgf000079_0001
Figure imgf000079_0002
In the above scheme RL represents:
Figure imgf000079_0003
In general, unsymmetrical dimers, with respect to their N1G-C1 bonds, may be prepared by treating bis-amino compounds of formula IV with one equivalent of a commerciaSly avaiiable {or readily prepared) chloroformate reagent in order to break the symmetry of the rnoiecu!es. The remaining free amine can then be functionalised independently to introduce the linking group precursor (RL). Further functional group manipulation to close the PBD B-ring, remove protecting groups affords the target molecule.
Compounds of formula iV are typically prepared by coupling a suitably functionalised C-ring fragment (!) to an A-ring containing dimer core of formula II. C-ring fragments may be prepared from known carbamate protected methyi 4-oxoproSinate buiiding blocks.
Oiefination under Witts g or Horner-Emmons conditions can be employed to furnish &ndo- or exo-unsaturated afkenes, C-ring and A-ring fragments can be coupled under standard conditions in the presence of triethylamine, using acid chloride derivatives of the A-ring fragments to give molecules of formula III. Symmetry may also be broken at this stage by introducing different C-rings. Compounds of type III can be reduced, without affecting endo or exo C-ring unsaturation, with zinc in acetic or formic acid to afford molecules of formula IV. Alternatively, a suitable 4-hydroxy pyrrolidine building block may be coupled to a dimer core of formula II. The hydroxy! groups can be oxidized to ketones and then converted to enol triflates. Suzuki coupling can be used to introduce the pro C2 substituents {e.g. aryl, aikenyS etc). The nitro groups can then be reduced to amines, one amine is protected leaving the other free to bear the linker group.
Unsymmetrical carbamates of type VI can be prepared by treating bis-amines of type IV with a single equivalent of a commercially available (or readily prepared) chloroformates in the presence of pyridine or triethySamine. Chloroformates may be selected to afford appropriate carbamate based nitrogen protecting groups (Prof) which are orthogonal to those used in the pro-linker group (RL). The RL carbamate may be introduced by converting the remaining amino group to an isocyanate and quenching it with the RL alcohol. Alternatively the RL alcohol can be converted to a chloroformate or functional equivalent (fluoroformate, p-nitrocarbonate, pentafluorocarbonate or hydroxybenzotriazole carbonate). Finally, the remaining amino group can be converted to a reactive p-nitrocarbamate,
pentafiuorocarbamaie or hydroxybenzotfiazole carbamate which can be displaced with the RL alcohol to afford molecules of formula VI.
Molecules of formula VII can be prepared from molecules of formula VI by removing the silyl protecting groups, with, for example, aqueous acetic acid. Oxidation with Dess-Martin periodinane (or alternatively TPAP/NMO, PDC or under Swern conditions) affords the ring closed product.
Conjugates of formula V may be prepared from molecules of formula VII by removal of the carbamate based nitrogen protection group.
In another embodiment, a conjugate of formula XVIII may be prepared from compound IX as shown in Scheme 2. Compound II
The synthesis of compounds of formula (Si) is described in trie applicant's earlier application, WO 2006/11 759 and is also described by Gregson et ai. (J. Med Chem. 2001 44, 1161- 1174). The preparation of compound (IS) as described therein is specifically incorporated by reference herein.
Reference is also made to the known methods of synthesising PBD dirners, including those reviewed in Antonow, D. and Thurston, D.E., Che , Rev. 2011 111 (4), 2815-2884. Further relevant disclosure may be found in WO 2010/091150. The intermediate
compounds described in WO 2010/091 50 may also be employed in the methods described above.
For example, the dimer compound (15) shown in paragraph [184] may be used as compound {Hi} in Scheme I above. This, and further adaptations, would be apparent to one of skill in the art.
Examples
General Experimental Methods
Optical rotations were measured on an ADP 220 polarimeter (Bellingham Stanley Ltd.) and concentrations (c) are given in g/I QrnL Melting points were measured using a digital melting point apparatus {Electrothermal). IR spectra were recorded on a Perkin- Elmer Spectrum 1000 FT IR Spectrometer. 'H and !3C N R spectra were acquired at 300 K using a Bruker Avance NMR. spectrometer at 400 and 100 MHz, respectively. Chemical shifts are reported relative to T!V!S (6 = 0.0 ppm), and signals are designated as s (singlet), d (doublet), t (triplet), dt (doubie triplet), dd (doublet of doublets), ddd (double doubiet of doublets) or m (muitip!et), with coupling constants given in Hertz (Hz), Mass spectroscopy (MS) data were collected using a Waiers Micromass ZQ instrument coupled io a Waters 2695 HPLC with a Waiers 2998 PDA, Waters Micromass ZQ parameters used were; Capillary (kV), 3.38; Cone (V), 35; Extractor (V), 3,0; Source temperature (,5C), 100; Desolvation Temperature ("C), 200; Cone flow rate (L h), SO; De-soivatson flow rate {L/h), 250, High-resolution mass spectroscopy (HRMS) data were recorded on a Water Micromass QTOF Global in positive W-mode using metal-coated borosilicate glass tips to introduce the samples into the instrument. Thin Layer Chromatography (TLC) was performed on silica gel aluminium; plates (Merck 60, F¾.¾}: and flash chromatography utilised silica gel (Merck 60, 230-400 mesh ASTM). Except for the HOSt (NovaBiochem) and solid-supported reagents (Argonaut), all other chemicals and solvents were purchased from Sigma-Aldrich and were used as supplied without further purification. Anhydrous solvents were prepared by distillation under a dry nttrogen atmosphere in the presence of an appropriate drying agent, and were stored over 4A molecular sieves or sodium wire. Petroleum ether refers to the fraction boiling at 40-60°C.
General LC S conditions: The HPLC (Waters Alliance 2695) was run using a mobile phase of water (A) (formic add 0.1 %) and acetonitrile (8} (formic acid 0.1%). Gradient: initial composition 5% B over 1.0 min then 5% 8 to 95% B within 3 min. The composition was held for 0.5 min at 95% B, and then returned to 5% B in 0.3 minutes. Total gradient run time equals 5 min. Flow rate 3.0 mL min, 400μΙ was split via a zero dead volume tee piece which passes into the mass spectrometer. Wavelength detection range; 220 to 400 nm, Function type: diode array (535 scans). Column: Phenomenex® Onyx Monolithic C18 50 x 4.60 mm
Example 1
(a) (S)-2-(methoxycarbonyl)-4-methylenepyrrolidiniu chloride (3)
Figure imgf000082_0001
2 3
(i) (S)-1-tert~butyi 2-methyi 4-met y!enepyrroMne~1,2-dicarboxyiate (2)
Potassium carbonate (19.92 g, 14 mmoi, 3 eq.) was added to a stirred solution of the carboxy!ic acid (1) (10.92 g, 48 mmoi, 1 eq.) in DMF (270 ml_). The resulting white suspension was stirred at room temperature for 30 minutes, at which point iodomethane (21.48 g, 9.5 ml. 151 mmoi, 3.15 eq.) was added. The reaction mixture was allowed to stir at room temperature for 3 days. The DMF was removed by rotary evaporation under reduced pressure to afford a yellow residue which was partitioned between ethyiacetate and water. The organic layer was separated and the aqueous phase was extracted with ethyiacetate. The combined organic layers were washed with water, brine and dried over magnesium sulphate. The ethyiacetate was removed by rotary evaporation under reduced pressure to give the crude product as a yellow oil. The crude product was purified by flash chromatography [85% n-hexane/15% ethyiacetate] to afford the product as a colorless oil. {Known compound F anfre er a/,, J, Org, Chem. 1992, 57, 2060-2065) (H) (S}~2~(meihQxycarhanyt)~4-methyienepyrmiidmum chloride (3)
A solution of 4 M hydrochloric acid in dioxane (63 ml, 254,4 mmoi, 4,5 eq.) was &άά&ά to the Boc protected C-ring fragment (2) (13.87 g, 58.8 mmo!. 1 eq.) at room temperature. Effervescence was observed indicating liberation of CC and removal of the Boc group. The product precipitated as a white solid and additional dioxane was added to facilitate stirring. The reaction mixture was allowed to stir for an hour and then diluted with ether. The precipitated product vvas collected by vacuum Rltration and washed with additional ether. Air drying afforded the desired product as a white powder (9.42 g, 94%) (P Herdwijn et a/., Canadian Journal of Chemistry', 1982, 60, 2903-7)
(b) tert-butyl (5-((5-(5-amino-4-((S)-2-(((tert-butyidimethyisilyi)ox^
methylenepyrrolidine-1-carbonyl)-2-methoxyphenoxy)pentyl)oxy)-2-((S)-2-(((te^
butyidimetbyi$ifyl}axy}m&^
Figure imgf000083_0001
(i) {$)-{4A'-(pentane-1/5~diylQis{oxy)}^
(methoxycarbonyl}~4~met yiempyrro!id -1~yl) (5)
A catalytic amount of anhydrous DMF (0.5 ml) was added to a stirred suspension of oxalyS chloride (9.1 g, 8.2S mL, 71.7 mmoi, 3 eq.) and dimer core (4) (11 ,82 g, 23.9 mmoi, 1 eq.) in anhydrous DGM (180 mL) at room temperature. Vigorous effervescence was observed after the addition of DMF and the reaction mixture was allowed to stir for 18 h in a round bottom flask fitted with a eaicium chloride drying tube. The resulting clear solution was evaporated under reduced pressure and the solid triturated with ether. The solid product was collected by vacuum filtration, washed with additional ether and dried in vacuo at 40°C for 1.5 hours.
This solid was then added portion wise to a suspension of the C-ring (3) (9.35 g, 52.6 mmoi, 2.2 eq.) in TEA (12.08 g, 119.6 mmoi, 5 eq,} and dry DC (110 ml), maintaining th temperature between -40 and -50 0 with the aid of a dry ice/acetonitrife bath. The reaction mixture was allowed to stir at -40C'C for 1 our and then allowed to warm to room temperature at which point LCMS indicated the complete consumption of the starting material. The reaction mixture was diluted with additional DCM and washed sequentially with aqueous hydrochloric acid (1 M, 2 x 200 mL), saturated aqueous sodium bicarbonate (2 x 250 mL), water (250 mL), brine (250 mL), dried (MgS04). DCM was removed by rotary evaporation under reduced pressure to afford the product as a yellow foam (13.94 g, 79 %). Analytical Data: RT 3.95 min; MS (ES+) m/z (relative intensity) 741 (\M + 1]*-, 100).
(it) {S)~{4:4Hpeni®ft^ 5 }iy!bi${Qxy)}b^
(hyd!Xixy et y ~ ~met yfenepyrrotidin~i-yi)methanone} (6)
Solid lithium borohydride (0.093 g, 4.3 mmoi, 3 eq.) was added in one portion to a solution of the ester (S) (1.05 g, 42 mmoi, 1 eq.) in dry THF ( 0 mL) under a nitrogen atmosphere at 0°C (ice bath). The reaction mixture was allowed to stir at 0°C for 30 minutes and then allowed to warm to room temperature at which point precipitation of an orange gum was observed. The reaction mixture was allowed to stir at room temperature for a further 2 hours and then cooled in an ice bath and treated with water (20 mL) to give a yellow suspension. Hydrochloric acid (1iVl) was carefully added (vigorous effervescence!) until effervescence ceased. The reaction mixture was extracted with ethyiacetate (4 x 50 mL) and the combined organic layers were washed with water (100 mL), brine (100 ml) and dried ( gS04).
Ethyiacetate was removed by rotary evaporation under reduced pressure to yield the product as a yellow foam (0.96 g, 99%). The reaction was repeated on a 12.4 g scale to yield 11.06 g of product (96%). Analytical Data: RT 3.37 min; MS (ES\) m/z (relative intensity) 885 ([M + H]+ , 100).
(Hi) (S}~((peniane~l -diy!bi$(oxy))bi$(5-mefho
butyitiimethylsilyi}oxy}mei yl}-4-m (7)
A solution of ij/'s-nitro alcohol (6) (7,34 g, 11.6 mmoi, 1 eq), iert-butyldimethyisiiyichloride (4.54 g, 30.15 mmoi, 2.6 eq) and imidazole (4.1 g, 60.3 mmoi, 5.2 eq) in anhydrous DMF (100 mL) under an argon atmosphere was stirred at room temperature for 3 hours. The reaction mixture was diluted with water (250 ml) and extracted with DCM (4 x 100 mL). The combined extracts were washed with water (200 ml), saturated brine (200 ml), dried
(MgS04) and evaporated under reduced pressure. The residue was purified by flash column chromatography [50% ethylacetate/50% n-hexane to 100% ethylacetate in 10% increments] io afford the product as a yellow foam {10.0 g. 94%). Analytical Data: RT 4.57 min; MS (ES") /z (relative intensity) 913 {[M * Hf , 100). (iv) ($)-{(pettiane- 1, 5^iy!bis(oxy))bi$(2-ammo-5-meth xy-4, 1-phen lene))bi$({{$)-2-(((teft- butyltiimethy yl)oxy)tmthyi)^met ytm&pycfoli<im- 1 -yl)methanone) (8)
Formic acid solution (5% v/v, 15 mL) was added in one portion to a mixture of zinc powder (29.56 g, 0.45 moi, 40 eq.) and compound (7) (10.34 g, 11.32 mmo!, 1 eq.) in
ethyiacetate/ethanoi (80 mL/150 mL). An exotiierm of 12t!C was observed. After 15 minutes the reaction mixture was filtered through celite washing with ethylacetate (excess). The filtrate was washed with saturated sodium bicarbonate (3 x 150 ml), water (200 ml), saturate brine (200 mL), dried (MgSO^) and evaporated under reduced pressure. Purification by flash column chromatography [ethylacetate] gave the product as a white foam (8,09 g, 84%). Analytical Data; RT 4.43 min; MS (ESf) m z (relative intensity) 853 (\M + Hf , 100).
(v) ferf-butyi (5~((5-(5-amifiQ-4-((S)-2-(((feff-butyldimethyisjiyS)oxy)meihyl)-4- methylenepyrrolidine-1-carbonyl)-2-methoxyphenoxy)pentyl)oxy)-2-((S)-2-(((ierf- butyldimethylsilyl)oxy)methyl)-4-methylenepyrrolidine-1-carbonyl)-4- methoxypheny!)carbamate (9)
A solution of the . ό/s-aniiine (8) (6.02 g, 7.1 mrno!, 1 eq.) and di-i-butyl-dicarbonate (154 g, 7.1 mmo!, 1 eq.) in anhydrous THF (50 mL) was heated at reflux for 16 hours. The solvent was evaporated under reduced pressure and th residue was purified by flash column chromatography [40% ethyiacetate/60% n-hexane to 60% ethyIaceiate/40% n-hexane to 100% ethylacetate ] to give the product as a white foam (3.22 g, 48%). Analytical Data: RT 4.27 min MS (ES+) m/z (relative intensity) 953 ([M + H , 100), MS (ES ) m/z (relative intensity) 951 ([M - H]V , 100).
(c) (11S, 11aS)-2-(pyridin-2-yldisulfanyl)ethyl 11-hydroxy-7-methoxy-8-((5-(((S)-7-methoxy-2- metbylene-5~Qx.o~2, 3.5, ΐ 1a~tetr8ftydro-1H-pyrrolo[2, 1~c][1 ,4]henzodiazepin~8~
yl)oxy)pentyi}oxy}'2-methylene-5-oxo-2i3, 11, 11a4etrahydro-1H-pyrrolo[2, 1- cj[1 , ^benzodiazepine- 1Q( 5H)-carbaxy1at& (14)
Figure imgf000086_0001
Compound 10 was prepareci according io Jones ef al, J. Am. Chem. Soc, 2006, 128, 6526-
6527. (i) tert-butyl (2-(pyridin-2-yldisulfanyl)ethyl) ((S)-(pentane-l, S-diylbis(oxy) )bis(2-((S)-2-(((tert- butyldimethylsilyl)oxy)methyl)-4-methylenepyrrolidine-1-carbonyl)-4-^
ph@nylerw))dicarbamaie (11)
Triethylamine (0.25 g, 0.34 ml, 2.42 mmoi, 2.2 eq.) was added to a stirred solution of the mono-Boc protected b/s-aniline (9) (1.05 g, 1.1 mmoi, 1.0 eq.) and triphosgene (0.1 17 g, 0.4 mmo!, 0.36 eq.) in dry THF (10 mL) under an argon atmosphere at room temperature. The reaction mixture was heated to 40eC and after 5 minutes a sample was treated with methanol and analysed by LCMS as the methyl carbamate. Analytical Data: RT 4.37 min MS (ES+) m z (relative intensity) 101 {{M + Hf , 100). A solution of 2-{pyridin-2-yidi$uifanyl)ethanol (10) (0.31 g, 1.65 mmoi, 1.5 eq.) and triethylamine (0.17 g, 0.23 ml, 1.65 mmo!, 1 ,5 eq.) in dry THF (10 mL) was added drop wise to the freshly prepared isocyanate. The reaction mixture was heated at 40°G for 1.5h after which time a further portion of triphosgene (0.058 g, 0.2 mmoi, 0.1S eq.) was added. After a further 30 min the reaction mixture was allowed to cool, filtered to remove triethylamine hydrochloride and the filtrate was evaporated to dryness to afford the crude product as a yellow oil which was purified by flash column chromatography [60% n-hexane/40% ethyiacetate changing to 55% n-hexane/45% ethyiaeeiate] to give the desired product as a colourless oii {0.63 g, 49%). Analytical Data: RT 4.50 min; MS (ES+) m/z {refative intensity) 1 166 ([M + Hf , 100), MS (ES ) m/z (relative intensity) 1164 ([M - H])\ 70).
(ii) tert-butyl (2-(pyridin-2-yldisulfanyl)ethyl) ((S)-(pentane-1,5-diylbis(oxy))bis(2-((S)-2-
{ y0mxymethyt}~4~r thyienepyrrQ!idme-1^
(12)
AcOH/H20 (3/1/) (8 ml) was added to a solution of compound (11) (0.37 g, 0.32 mmoi, 1 eq) in THF (2 mL) and the resultant solution was stirred at room temperature for 18h. The pH of the reaction mixture was adjusted to pH with saturated NaHC03 soiution. The mixture was extracted with ethyiacetate (3 x 100 ml) and the combined extracts were washed with saturated NaHG<¾ solution (100 mL), water (100 ml), saturated brine (100 mL), dried (MgSCX;) and evaporated under reduced pressure. Purification of the residue by flash column chromatography [gradient elution chioroform/methano! 0% to 5% in 1 % increments] gave the product as a white foam (0.24 g, 81 %). Analytical Data: RT 3.08 min; MS (ES') m z (relative intensity) 938 ({M + H}\ 100), MS (ES ) m/z (relative intensity) 936 ([M - H]V , 00). (in) (11$, 11a$)-tert-butyl ii-hydroxy-S-{(5-(({i 1S, 11aS)-11-hydroxy-7-methoxy-2- methylene-5-Όχο- 10-((2-(pyndm-2-yid!su!fanyi)ethoxy)carbonyl)-2, 3,5, 10, 11, 11 a-hexahydro-
2,3, 11, 11a-tetrahydrQ-1H-pyrroio{2, 1-c][1,4]benzodiazepine~10(5H) arbOKylai& (13)
A solution of DMSO (79 mg, 72 μΐ . 1.0 mmoi, 4,4 eq) in DCM (5 mL) was added dropwise to a soiution of oxalyi chloride (62 mg, 42 ΐ, 0.49 mmoi. 2.15 eq.) in DCM (5 mL) under an argon atmosphere at -78!>C (dry ice/acetone). The soiution was stirred at -78°C for 15 minutes. A soiution of compound (12) (0.214 g, 0.23 mmoi, 10 eq.) in DCM (6 mL) was added dropwise and the mixture was stirred at -78°C for 45 minutes. Tnethylaroine (0.23 g, 0.32 mL, 2.28 mmoi, 10 eq.) was added and after 5 min the reaction mixture was aiiowed to reach room temperature. The reaction mixture was treated with saturated NH4Cl soiution (15 mL), the organic portion was separated and washed with 1 M citric acid soiution (3 x 50 mL), saturated NaHCOa soiution (100 ml), water (10QmL), saturated brine (100 mL). dried (MgSC ) and evaporated under reduced pressure to give a paie yellow oil. Purification by flash column chromatography gave the product as a white foam (63 mg, 32%). Analytical Data; RT 2.90 min; ivl$ (ES+) m/z (relative intensity) 933 ([M + Hf , 50), MS (ES"} /z
(relative intensity) 935 {{M - Hj) ·, 55). 0v) {11$, 1 l8$)-2-(pyridin~2-yldi$uifanyQet yf i 1-hydroxy-7-methoxy-8-((5-(((S)-7-methoxy-2- me$? /ene-5 sxo- ^^
yljoxyjpeniyilQxyj^-methyleae-S-Qxo^S, 11, 11a-tetrahydro-1H-pyrrolo[2, 1- c}[ 1 b zodiazepin@- 10(5H)-carboxyfate (14)
A cold (ice bath) soiution of 95% trif!uoroaceiic acid (1 mL) was added to compound 13 which had been cooled in an ice bath. The soiution was stirred at 0°C for 15 minutes when it was shown to be compiete by LC¾1S. The reaction mixture was added dropwise to a mixture of ice and saturated NaHC03 solution to neutralise the trifluoroacetic acid solution. The mixture was extracted with DC (4 x 50 ml) and the combined extracts were washed with saturated brine (100 mi), dried (fvlgSQ.*) and evaporated under reduced pressure to give the product as a white foam (26 mg, 96%). Analytical Data: RT 2.72 mm, MS (ES+) /z (relative intensity) 816 {[M + Hf , 70), MS (ES ) m/z (relative intensity) 814 ftM - H])\ 40). Example 2
(a) {R)-2-(pyridin-2-y!d!Suifaflyi}pr0pan-1-ol (18)
Figure imgf000088_0001
Figure imgf000088_0002
(i) (R)-methyt 2-(acetylthio)propanoate (16)
Thioacetic acid (1.99 g; 1.86 mL, 26.1 mmo!, 1.1 eq.) was added to a suspension of cesium carbonate (7.73 g, 23.72 mmol, 1.0 eq.) in dry DMF (40 mL). After 30 minutes (S)-methyl 2- chioropropanoate (15) was added and the mixture was allowed to stir at room temperature for 1 hour. The reaction mixture was partitioned between diethyl ether (150 ml) and water (150 mL); the water was separated and washed with a further portion of diethyl ether (150 ml). The combined organic portions were washed with water (6 00 mL), brine (200 mL), dried (fvigSO.t) and evaporated under reduced pressure. Purification by flash column chromatography (10% etbyiaoefate/90% n-hexanej gave the product as a co!ouriess oi! (3.01 g, 82%). Anaiyticai Data; RT 2.25 min; MS (ES'1) /z (relative intensity) 163 {{M + Hf, 10), 185([M + Naf, 65); [a]'d = f+14lf ;' s (c, 2.26 CHCIS). (ii) (R)-2-mercaptopropan-1-ol (17)
A solution of thioacetate (16) [0,57 g, 3,54 mmo!, 10 eq.) in dry THF (10 mL) was added drop wise to a suspension of lithium aluminium hydride (0,54 g, 14,15 mrrtoi, 4,0 eq.) in dry THF (20 ml) at reflux under an argon atmosphere. After h the reaction mixture was cooled to 0°C and 2M HC1 was added drop wise maintaining the temperature below 30°C until effervescence ceased. The resultant mixture was allowed to stir at room temperature for 1 hour then fiiiered through ceiite washing with THF (40 mL). The solvent was evaporated; the residue was re- isso!ved in DGIV1 and dried (M®SG4). Evaporation of the DCM under reduced pressure followed by column chromatography of the residue |6Q% n-hexane/40% ethylacetate] gave the product as a pale yellow oil (0.193 g, 58%). Analytical Data: [afd = [- 22],7-2 d (c, 0.972 CHCIa).
(Hi) (R)'2^yridin-2~y!di$u!fanyi}propan-1~ol (18)
Su!furyl chloride (1 M in DCM, 2.0 mL, 2,0 mmol, 11 eq.) was added drop wise to a solution of 2-mercaptopyridtne (0,2 g, 1 ,81 mmol, 1 ,0 eq.} in dry DCM (5 mL) at 0!>C under an argon atmosphere. The resultant solution was stirred at room temperature for 2 hours and the DCM was evaporated under reduced pressure to give a yellow solid. The solid was suspended in dry DCM (10 ml) and a solution of (R)-2-mercaptopropan-1 -oi {17)(0.18 g, 1.95 mmo 1.08 eq.) in dry DCM (5 mL) was added drop wise. The mixture was stirred at room temperature for 18 hours under an argon atmosphere. The reaction mixture was filtered and the filtrate was evaporated under reduced pressure to give a yellow gum. The gum was re-dissolved in water and the solution was bastfied with ammonium hydroxide solution, extracted with DCM (3 x 50 mL) and the combined extracts were washed with water (100 mL), brine (100 mL), dried (MgS04) and evaporated to give a yellow oii. Purification by flash column chromatography [80% n-hexane/20% ethylacetate to 60 % n-hexane/40% ethylacetate in 5% increments] gav the product as a colourless oil (0.213 g, 59%).
Analytical Data: RT 2.43 min; MS (ES' i m z (relative intensity) 202 ({M + H]\ 50); [oil, - [+27Z†t, rc a (c, 0.28 CHC!g). (b) (11$, 11a$HR)'2-(pyndin-2'yldisuifanyi}propyl 11-hydroxy-7-methoxy-8-((5-(((S)-7- methQxy~2~m&t ylene~5~oxQ~2!3! 5, 1 la-tet ydro-1H~pyrrolQ[2, 1~c][1,4]benzodiazepin-8~ yi)oxy}pmtyl)oxy)-2-methy!ene-5-oxo-2,3! 11, 11a-tet hydro~1H-pyrrQlof2, 1- c][1s4]benzQdiazepin@-1Q(5H)~carboxylaie (22)
Figure imgf000090_0001
Figure imgf000090_0002
Figure imgf000090_0003
f iert-butyl {(R}-2-{pyrsdin-2-yidisuifanyi)propyl) {(S)-(peniane-l ,5-diyibis{oxy})hi (2-{(S)-2~ ({iie?i-butySdimethylsilyl)oxy)methy!M^
phenyiene}}dicarbamate (19)
Trieihyiarnine {0.28 g, 0.39 mL, 2.8 mmoi, 2.2 eq.) was added to a stirred solution of the mono-boc protected ft s-ansline (9) (1.21 g, 1.27 mmoi, 1.0 eq.) and triphosgene (0.136 g, 0.46 mmoi, 0.38 eq.) in dry THF (15 mL) under an argon atmosphere at room temperature. The reaction mixture was heated to 40°C and after 5 minutes a sample was treated with methanol and analysed by LC s as the methyl carbamate. Analytical Data: RT 4.30 min MS (ES+) m/z (relative intensity) 1011 ( + Hf, 100).
A solution of ( )-2-{pyr!din~2-yidisuifanyi)propan-1-o! (18) (0,38 g, 1 ,91 mmoi, 1.5 eq.) and iriethyiamine (0.19 g, 0,27 mL, 1.91 mmoi, 1 ,5 eq.) in dr THF (10 mL) was added drop wise to the freshly prepared isocyanate. The reaction mixture was heated at 40*C for 4 hours and then stirred at room temperature for 18 hours. The reaction mixture was filtered to remove triethyia ine hydrochloride and the filtrate was evaporated to dryness to afford the crude product as a yellow oil which was purified by flash column chromatography [80% n- hexane/40% ethylaeetate to 40% i hexane/60% ethylaeetate in 5% increments] to give the desired product as a white foam (0,75 g, 50%). Analyticai Data: RT 4.50 min: MS (ES+) m/z (relative intensity) 1180 {[M + Hf , 60); [<afd
Figure imgf000090_0004
(c, 0.28 CHCi3). (ii) tert-butyl ((R)-2-(pyridin-2-yldisulfanyl)propyl) ((S)-(pentane-1,5-diylbis(oxy))bis(2-((S)-2- ydroxymet yl}-4-meinyi 8pyrmiidine~1~carbonyl)-4-m^
(20)
Acetic act<J/H20 (3/1 , 16 mL) was added to a solution, of the bis-sWy] ether (19) (0.72 g, 0.61 mmol, 1 eq.) in THF (4 mL). The resultant solution was stirred at room temperature for 16 hours. The pH of the reaction mixture was adjusted to pH8 with saturated sodium bicarbonate solution. The mixture was extracted with ethylaeetate (4 x 150 mL) and the combined extracts were washed with saturated sodium bicarbonate solution (2 x 150 mL), water (150 mL), brine (150 mL), dried (¾1gS04) and evaporated under reduced pressure. Purification by flash column chromatography gave the product as a white foam (0.56 g, 98%). Anaiyticai Data: T 3.15 min; MS (ES÷) m/z (relative intensity) 953 ([M + H]+ , 100);
Figure imgf000091_0001
(in) (11S, 11aS)-tert-butyl 11-hydroxy~8~{(5-(({11S, 11aS)-11-hydroxy-7-methoxy-2- meibyiene-5~oxo-10-(((R}-2~(pyridin-2-yidisuifanyl)propoxy)carbonyl)-2,3,5, 10, 11, 11a-
Figure imgf000091_0002
ethyiene-5-oxo-SA 1 ?, 11a-tetrahydro-1H-pyrrolo[2,, 1 -c 1 ^benzodiazepine- 10(5H)- carboxylate {21}
A solution of DMSO (91 mg, 83 pL, 1.18 mmol, 4.4 eq,) in anhydrous DCM {5 mL) was added drop-wise to a soiution of oxaiyl chloride (2.0M in DCM, 318 ί, 0.635 mmoi, 2.4 eq.) in anhydrous DCM (5 mL). at -40aC under an argon atmosphere. The soiution was stirred at -40SC for 15 minutes, A solution of the Ws-a!coho! (20) {0.252 g, 0.26 mmol, 1 eq.) in anhydrous DCM (10 mL) was added drop wise and the resuStant mixture stirred at -40*0 for 45 minutes. During this time the temperature was allowed to reach -25°C. The temperature was lowered to -35°C and triethylamine (0.27 g, 0.36 mL, 2.6 mmol, 10 eq.) was added drop wise. After 5 minutes the temperature was allowed to reach room temperature. The reaction mixture was di!uted with DCM (50 ml) and extracted with 1M citric acid solution (3 x 150 mL), saturated sodium bicarbonate soiution (150 mL), water (200 mL), brine (200 ml), dried {MgS0 ) and evaporated under reduced pressure to give a yellow foam. Purification by flash coiumn chromatography [ch!oroform/methanol 0% to 2% in 0.5% increments] gave the product as a white foam (0.137 g, 53%), Analytical Data; RT 3,17 min; MS (£S*) m/z (relative intensity) 948 (| + Hf -, 00); [α¾ - [+170 ¾ Vj (e, 0.25 CHC!3).
(iv) (11S, 1 la$}~(R}-2~(pyadin-2-yldi$ulfetnyl)propyl 11-hydroxy-7-methoxy-8-((5-(((S)-7- methoxy-2~m®t yiene-5-Qxo~2, ¾ 5, 1 fs~tetra ydro- 1 H-pyrrolo[2, 1 -c][ 1 , 4]benzodiazepin-8- yl)oxy)pentyl)oxy)-2-methylene-5-oxo-2,3, 11, 11a-tetrahydro-1H-pyrrolo[2, 1- cj[1 ^benzodiazepine- lQ(5H)~carboxylate (22)
A cold (ice bath) solution of 95% trifluoroacetie acid (8.5 ml.) was added to compound (21) (0.221 g, 0.23 mmoi, 1 eq.) which had been cooled in an ice bath. The solution was stirred at OX for 25 minutes when it was shown to be complete by LC S. The reaction mixture was added drop-wise to a mixture of ice and saturated sodium bicarbonate solution (200 ml.) to neutralise the trifluoroacetie acid solution. The mixture was extracted with DCM (4 x 75 ml) and the combined extracts were washed with water (100 ml) saturated brine (100 ml), dried (M3SO ) and evaporated under reduced pressure to give the crude product. Purification by flash column chromatography [chloroform/methanol 0% to 3% in 1 % increments] gave the product as a white foam (0.192 g, 99%). Analytical Data: RT 3.00 min; MS (ES*) m z (relative intensity) 830 ({M + Hf , 75); [α]ι ύ = [+444]?2¾ ϋ (c, 0.26 GHCI3).
Example 3: Determination of In Vitro Cytotoxicity
K562 human chronic myeloid leukaemia ceils were maintained in RPIVS1 1640 medium; supplemented with 10% fetal calf serum and 2 mM giutamine at 37°C in a humidified atmosphere containing 5% COa and were incubated with a specified dose of drug for 96 hours at 37X in the dark. The incubation was terminated by centrifugation (5 min, 300 g) and the cells were washed once with drug-free medium. Following the appropriate drug treatment, the ceils were transferred to 96-well microtiter plates (104 ceils per well, 8 wells per sample). Plates were then kept in the dark at 37 X In a humidified atmosphere containing 5% CO . The assay is based on the ability of viable ceils to reduce a yellow soluble tetrazoiium salt, 3-(4,5-dfmethyithiazoi-2-yi)-2,5-diphenyi-2H-tetrazoltum bromide (ίνΠ'Τ, Aidrich-Sigma), to an insoluble purpie formazan precipitate. Following incubation of the plates for 4 days (to allow control cells to increase in number by approximately 10 fold), 20 μΐ of MIT solution (6 mg/mL in phosphate-buffered saline) was added to each welt and the plates further incubated for 5 hours. The pistes were then centrifuged for 5 minutes at 300 g and the bu!k of the medium pipetted from the cell pellet leaving 10-20 pL per well. DMSO (200 μΐ) was added to eac well and the samples agitated to ensure complete mixing. The optical density was then read at a wavelength of 550 nm on a Titertek ultiscan ELISA plate reader, and a dose-response curve was constructed. For each curve, an IC50 value was read as the dose required to reduce the final optical density to 50% of the control value. Reduction/Oxidation of ThioMabs for Conjugation
Full length, cysteine engineered monoclonal antibodies (ThioMabs - Junuiu!a. et ai„ 2008b Nature Biotech,, 26(8);925-932; Dornan et ai (2009) Blood 114(13):2721 -2729; US 7521541 ; US 7723485; WO2GG9/052249, Shen et al (2012) Nature Biotech., 30(2): 184-191 ; Junutute et al (2008) Jour of immun. Methods 332:41-52) expressed in CHO cells were reduced with about a 20-40 fold excess of TCEP (tris(2-carboxyethyl)phosphine hydrochloride or DTT (diibiothreitoi) in 50 mM Ins pH 7.5 with 2 m EDTA for 3 hrs at 37°C or overnight at room temperature.(Getz et al (1999) Anal. Biochem, Vol 273:73-80; Soitec Ventures, Beverly, MA). The reduced ThioMab was diluted and loaded onto a HiTrap S column in 10 mM sodium acetate, pH 5, and eluted with PBS containing 0.3M sodium chloride. Alternatively, the antibody was acidified by addition of 1/20* volume of 10% acetic acid, diluted with 10 mM succinate pH 5, loaded onto the column and then washed with 10 column volumes of succinate buffer. The column was eluted with 50 mM Tris pH7.5, 2 mM EDTA. The eluted reduced ThioMab was treated with 15 fold molar excess of DHAA
(dehydroascorbic acid) or 200 niV1 aqueous copper sulfate (CuS04). Oxidation of the interchain disulfide bonds was complete in about three hours or more. Ambient air oxidation was also effective. The re-oxidized antibody was dialyzsd into 20 m sodium succinate pH 5, 150 mM NaC!, 2 mM EDTA and stored frozen at -20 'C.
Conjugation of Thio-Mabs with Compounds to prepare antibody-drug conjugates
The deblocked, reoxidized, tnio-antibodies (ThioMab) were reacted with 8-8 fold molar excess of the compounds above (14, 22}(from a DMSO stock at a concentration of 20 mM) in 50 mM Tris, pH 8, until the reaction was complete (16-24 hours) as determined by LC-MS analysis of the reaction mixture.
The crude antibody-daig conjugates (ADC) were then applied to a cation exchange column after dilution with 20 mM sodium succinate, pH 5. The column was washed with at least 10 column volumes of 20 mM sodium succinate, pH 5, and the antibody was eiuted with PBS. The antibody drug conjugates were formulated Into 20 mM His/acetate, pH 5, with 240 mM sucrose using gei nitration columns. The antibody-drug conjugates were characterized by UV spectroscopy to determine protein concentration, analytical SEC (size-exclusion chromatography) for aggregation analysis and LC-MS before and after treatment with Lysine C endopeptidase. Size exclusion chromatography was performed using a Shodex KW802.5 column in G.2M potassium phosphate pH 6.2 with 0.25 mM potassium chloride and 15% SPA at a flow rate of 0.75 ml/min. Aggregation state of the conjugate was determined by integration of eluted peak area absorbance at 280 nm.
LC-MS analysis was performed using an Agilent QTOF 6520 ESI instrument. As an example, and an antibody-drug conjugate generated using this chemistry was treated with 1 :500 w/w Endoproteinase Lys C (Promega) in Tns, pH 7.5, for 30 min at 37°C. The resulting cleavage fragments were loaded onto a 1000A, 8 urn PLRP~S column heated to 80°C and eluted with a gradient of 30% B to 40% B in 5 minutes. Mobile phase A was H¾0 with 0.0.5% TFA and mobile phase B was acetonitrile with 0.04% TFA. The flow rate was 0.5ml/min. Protein eiuiion was monitored by UV absorbance detection at 280nm prior to eiectrospray ionization and MS anaiysis. Chromatographic resoiuiion of the unconjugated Fc fragment, residua! unconjugated Fab and drugged Fab was usually achieved. The obtained m/z spectra were deconvoluted using Mass Hunter™ software (Agilent Technologies) to calculate the mass of the antibody fragments.
As an example, the molecular weight (MW) for thio-Tmab conjugated with 22 (mass addstioo-720 daltons). Observed deconvoluted masses:
53,296 daltons corresponds to MW of unconjugated Fc fragment
47,431 daltons corresponds to MW of unconjugated Fab fragment
48,150 daltons corresponds to MW of drugged Fab fragment
Thus the observed peak at 48,150 da!tons corresponds to the expected Fab fragment (47,431 daltons) bearing one drug 22 (+720 daltons).
ADC T io-conjugates with 22
Mass addition 719,84
Figure imgf000095_0001
ADC Thio-conjugates with 14
Mass addition 705.81
Figure imgf000095_0002
The following in vitro and in vivo assays are also described in Phillips et al (2008) Cancer Res. 68(22):9280-9290. In vitro cell proliferation assay
Efficacy of ADC were measured by a ceil proliferation assay employing the following protocol (CeS!Tier Glo Luminescent Ceii ViabiSiiy Assay, Promega Corp. Technical Bulletin TB288; Mendoza et ai (2002) Cancer Res. 62:5485-5488). Aii ceii iines were obtained from
American Type Cuiture Collection:
1. An aliquot of 100 μί of ceil cuiture containing about 104 cells (for example, KPL-4, a human breast cancer ceii line, Kurebayashi et a! (1999) Brit. Jour. Cancer 79(5-6):707-717), SKBR-3, or IV1CF7) in medium was deposited in each ei! of a 96-we!l, opaque-walled plate.
2, Control wefis were prepared containing medium and without ceils.
3. ADC was added to the experimental wells and incubated for 3-5 days.
4. The plates were equilibrated to room temperature for approximately 30 minutes. 5. A volume of CellTiter-Glo Reagent equal to the volume of cell culture medium present in each well was added.
6. The contents were mixed for 2 minutes on an orbital shaker to induce cell lysis.
7. The plate was incubated at room temperature for 10 minutes to stabilize the luminescence signal.
8. Luminescence was recorded and reported in graphs as RLU = relative luminescence units.
Certain cells are seeded at 000-2000/well or 2000-3000/wellin a 96-well plate, 50 uL/well. After one or two days, ADC are added in 50 μΐ volumes to final concentration of 9000, 3000, 1000, 333, 111 , 37, 12.4, 4.1 , or 1.4 ng/mL, with "no ADC" control wells receiving medium alone. Conditions are in duplicate or triplicate After 3-5 days, 100 ,uL/weSf Ceil TiterGlo II is added (luciferase-based assay; proliferation measured by ATP levels) and ce!l counts are determined using a luminometer. Data are plotted as the mean of luminescence for each set of replicates, with standard deviation error bars. The protocol is a modification of the CellTster Gio Luminescent Cei! Viability Assay (Promega):
1. Plate 1000 ceils/ well in SO μΐ wel! of FBS/glutamine media. Allow cells to attach overnight
2. ADC is serially diluted 1 :3 in media beginning at at working concentration 18 g/ml (this resuits in a final concentration of 9 pg/m!). 50 μΐ of diluted ADC is added to the 50 ΐ of ce!!s and media already in the well
3, Incubate 72-98 hrs (the standard is 72 hours, but watch the 0 ug/ml concentration to stop assay when the cells are 85-95% confluent).
4, Add 100 pL/wei! of Promega Cell Titer G!o reagent, shake 3 min. and read on
luminometer
Resuits
Antibody-drug conjugates, trastuzumab-14 (110) and tfastuzumab-22 (101 ) were tested against SK-BR-3, KPL-4, and CF-7 (Levenson et ai (1997) Cancer Res. 57(15):3071-3078) cells to measure in vitro cell viability in five day studies. The IC½ (pg/mL). value for 101 against SK-BR-3 was 22.12. The ICS0 value for 110 against SK-BR-3 was 102.78. are SK- BR-3 ceils are HER2+ expressing, trastuzumab sensitive. Both 101 and 110 were effectively inactive against WICF-7, which is a HER2 non-expressing human breast adenocarcinoma ceil line. Thus, conjugates 101 and 110 demonstrate targetted cell killing potency. Tumor growth inhibition, in vivo efficacy in high expressing HER2 transgenic explant mice
Animals suitable for transgenic experiments can be obtained from standard commercial sources such as Taconic (Germantown, N.Y.). Many strains are suitable, but FVB female mice are preferred because of their higher susceptibility to tumor formation. FVB males were used for mating and vasectornized CD.1 studs were used to stimulate pseudopregnancy. Vasectomized mice can be obtained from any commercial supplier. Founders were bred with either FVB mice or with 129/8L6 x FV8 p53 heterozygous mice. The mice with heterozygosity at p53 allele were used to potentially increase tumor formation. However, this has proven unnecessary. Therefore, some F1 tumors are of mixed strain. Founder tumors are FVB only. Six founders were obtained with some developing tumors without having litters.
Animals having tumors (allograft propagated from Fo5 mmtv transgenic mice) were treated wit a single or muiisple dose by !V injection of ADC. Tumor volume was assessed at various time points after injection.
Tumors arise readily in transgenic mice that express a mutationally activated form of neu, the rat homo!og of HER2, but the HER2 that is overexpressed in human breast cancers is not mutated and tumor formation is much less robust in transgenic mice that overexpress nonmutated HER2 (Webster ei a/ (1994) Semin. Cancer Bio!. 5:69-76).
To improve tumor formation with nonmutated HER2, transgenic mice were produced using a HER2 cDNA plasmid in which an upstream ATG was deleted in order to prevent initiation of translation at such upstream ATG codons, which would otherwise reduce the frequency of translation initiation from the downstream authentic initiation codon of HER2 (for example, see Child et a! {19SS} J. Bio!. Che . 274: 24335-24341 ). Additionally, a chimeric irstron was added to the 5' end, which should also enhance the level of expression as reported earlier {Neuberger and Williams (1988) Nucleic Acids Res. 16:6713; B chman and Berg (1988) MoL Ceil Biol, 8:4395; Brinster et a! (1988) Pmc. Nat!, Acad. Set USA 85:838), The chimeric tniron was derived from a Promega vector, Pci-neo mammalian expression vector (bp 890-1022). The cDNA 3'-end is flanked by human growth hormone exons 4 and 5, and polyadeny!ation sequences. Moreover, FVB mice were used because this strain is more susceptible to tumor development. The promoter from MTV-ITR was used to ensure tissue-specific HER2 expression in the mammary gland. Animals were fed the AIN 76A diet in order to increase susceptibility to tumor formation (Rao ef a/ (1997) Breast Cancer Res. and Treatment 45: 149-158),
Fo5 murine mammary tumor model
The Fo5 model is a transgenic mouse model in which the human HER2 gene, under transcriptional regulation of the murine mammary tumor virus promoter {MMTV-HER2), is overexpressed in mammary epithelium. The overexpression causes spontaneous development of mammary tumors that overexpress the human HER2 receptor. The mammary tumor of one of the founder animals {founder #5 [Fo5]) has been propagated in subsequent generations of FVB mice by serial transplantation of tumor fragments. Before being used for an in vivo efficacy study, the iYiMTV~HER2 Fo5 transgenic mammary tumor was surgically transplanted into the No. 2/3 mammary fat pad of nu/nu mice (from Charles River Laboratories) in fragments that measured approximately 2x2 mm. When tumors reached desired volumes, the tumor-bearing mice were randomized and given a single dose by I V injection of the ADC.
Results
Figure 1 shows a piot of the in vivo mean tumor volume change over time in breast cancer- model MTV-HER2 Fo5 mammary allograft tumors inoculated into CRL nu/nu mice after single iv dosing on day 0 with: (1 ) Vehicle 20m Histidtne acetate, pH 5.5, 240m M sucrose, {2} XCD22-22 (103) at lOmg/kg, (3) trastuzumab-22 (101 ) at 1 mg/kg, (4) trastuzumab-22 (101) at 3mg/kg, and (5) trastuzumab-22 (101) at 10mg/kg. The lines in the figure are indicated with the followin symbols:
Vehicie
Figure imgf000098_0001
— ADC 101 TiTis HG Al l 80, Omg/kg
~ Α QC KO CD22 HO Al 80, l Omg/kg
Figure 2 shows a piot of the in vivo mean tumor volume change over time in breast cancer- model MMTV-HER2 Fo5 mammary allograft tumors inoculated into CRL nu/nu mice after single iv dosing on day 0 with: (1 ) Vehicie 20mM Histidine acetate, pH 5.5, 240m sucrose, (2) XCD22-14 (112) at 6mg/kg, (3) trastuzumab-14 (110) at I mg/kg, (4) trastuzumab-14 (110) at 3mg/kg, (5) trastuzumab-14 (110) at emg/kg, and (6) trastuzumab-22 (101 ) at 1 mg/kg. The lines in the figure are indicated with the following symbols: Vehicle
ADC110 Tmab HC A11SC, 1 mg kg
ADC110 Tma HC A118C, 3mg/kg
Figure imgf000099_0001
ADC1 10 Tmab HC A118C, 6mg kg
ADC1 12 CD22 HC A1 1 8C , 6mg/kg
Abbreviations
Ac acetyl
Acm acetamidomethyl
Alloc allyloxycarbonyl
Boc di-fert-butyl dicarbonate
t-Bu tert-butyl
Bzi benzyl, where Bz!-OMe is methoxybenzyl and Bzl-Me is methyibenzene Cbz or Z benzyioxy-carbonyi,. where Z-Ci and Z-Br are chloro- and bromobenzyloxy carbonyi respectively
DMF A/,W-dimethylformamide
Dnp dinitrophenyl
DTT cJithiothreitol
Fmoc 9H-fluoren~9-yimethoxycarbonyl
imp W-10 imine protecting group; 3-(2-methoxyethoxy)propanoate-Val-Ala-PAB C-OSu maleimidocaproyS-O- -succinimfde
Moc methoxycarbonyl
MP maieimidopropanamide
Mtr 4-methoxy-2,3,6-trimethtylbenzenesulfonyl
PAB para-aminobenzyloxycarbonyl
PEG ethyleneoxy
PNZ p-nitrobenzyl carbamate
Psec 2-{phenyisulfonyS)etftoxycarboriyi
TBDMS tert-butyfdimethylsslyi
TBDPS tert-butyidiphenyistlyi
Teoc 2-(trimethylsilyl)ethoxycarbonyl
Tos tosyl
Troc 2,2,2-trichlorethoxycarbonyl chloride
Trt trityl
Xan xanthyl References
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Claims

Claims
1. A conjuga
Figure imgf000110_0001
A
the dotted lines indicate the optional presence of a double bond between C1 and C2 or C2 and C3;
R2 is independently selected from H, OH, =0, =CH2, CN, R, OR, =CH-RD, =C(RD)2, 0-S02-R, C02R and COR, and optionally further selected from halo or dihalo;
where RD is independently selected from R, C02R, COR, CHO, C02H, and halo;
R6 and R9 are independently selected from H, R, OH, OR, SH, SR, NH2, NHR, NRR', NO;;, Me3Sn and haio;
R? is independently selected from H, R, OH, OR, SH, SR, NH2, NHR, NRR', N02, e¾Sn and haio;
Y is selected from a single bond, and a group of formulae A1 or A2:
Figure imgf000110_0002
where N shows where the group binds to the 10 of the PBD moiety;
RL and R! ? are independently selected from H and methyl, or together wit the carbon atom to which they are bound form a cyclopropylene group;
C8A represents a cell binding agent;
Q is independently selected from O, S and NH;
R11 is either H, or R or, where Q is O, S03M, where M is a metal cation; R and R' are each independently selected from optionally substituted Ct.i2 a!kyi, Ca..¾j heterocyciy! and ary! groups, and optionally in relation to the group NRR', R and R' together with the nitrogen atom to whic they are attached form an optionally substituted
4-, 5-; 6- or Z-membered heterocyciie ring;
wherein R12, R i, R 9 and " are as defined for 2, Re, R9 and R? respectively: wherein R" is a Qua alky!ene group, which chain may be interrupted by one or more heieroatoms, e.g. O, S, N(H), IMMe and/or aromatic rings, e.g. benzene or pyridine, which rings are optional substituted;
X and Xs are independently selected from O, S and N(H).
2. The conjugate according to claim 1 , wherein R and R are both H.
3. The conjugate according to claim 1 , wherein RL and RL2 are both methyl. 4. The conjugate according to claim 1 , wherein one of RL and RL2 is H and the other is methyl.
5. The conjugate according to any one of claims 1 to 4, wherein Y is a single bond. 6. The conjugate according to any one of claims 1 to 4, wherein Y is:
Figure imgf000111_0001
Ί, The conjugate according to any one of claims 1 to 4, wherein Y is:
Figure imgf000111_0002
(A2).
8 The conjugate according to any one of claims 1 to 7, wherein R and R are H.
9 The conjugate according to any one of claims 1 to 8, wherein R6 and R 6 are H.
10. The conjugate according to any one of claims 1 to 9, wherein R7 are R 7 are both OR7A, where R7A is optionally substituted C1 alkyl.
11. The conjugate of claim 10, wherein RM is Me.
12. The conjugate according to any one of claims 1 to 11 , wherein X is O.
13. The conjugate according to any one of claims 1 to 12, wherein R1 is H. 14. The conjugate according to any one of claims 1 to 13, wherein there is a double bond between C2 and C3 in each monomer unit.
15. The conjugate according to claim 14, wherein R2 and R 2 are independently selected from H and R.
16. The conjugate according to claim 15, wherein R2 and R 2 are independently R.
17. The conjugate according to claim 16, wherein R2 and R 2 are independently optionafty substituted C5_20 aryf.
18. The conjugate according to any one of claims 1 to 13, wherein R2 and R 2 are independentiy selected from -0> =CH¾ =CH-RD, and =C(RD)2.
19. The conjugate according to claim 18, wherein R2 and R 2 are =CH2.
20. The conjugate according to any one of claims 1 to 19, wherein R" is a C3 alkylene group or a C5 alkylene group.
21. The conjugate according to any one of claims 1 to 20, wherein the cell binding agent is an antibody or an active fragment thereof.
22. The conjugate according to claim 21, wherein the antibody or antibody fragment is an antibody or antibody fragment for a tumour-associated antigen.
23. The conjugate of claim 21 wherein the antibody or antibody fragment is an antibody which binds to one or more tumo -associated antigens or cell-surface receptors selected from (1 H36):
(I) B!V!PRI S [bone morphogenetic protein receptor-type IB);
(2) El 6 (LAT1 , SIC7A5):
(3) STEAP1 (six transmembrane epithelial antigen of prostate);
(4) 0772P (CA125, MUC16);
(5) MPF (MPF, MSLN, SMR, megakaryocyte potentiating factor, mesothelin);
(6) Napi3b (NAPI-3B, NPTllb, SLC34A2, solute carrier family 34 (sodium phosphate), member 2, type II sodium-dependent phosphate transporter 3b);
(7) Sema 5b (FU10372, KIAA1445, Μϊθ.42015, SEMA58, SE AG, Semaphore 5b Hiog. se a domain, seven ihrom ospondin repeats (type 1 and type 1-iike),
transmembrane domain (T ) and short cytoplasmic domain, (semaphortn) 5B);
(8) PSCA hig (2700050C12Rik, C530008O16Rik, RIKEN cDNA 2700050C12, !KEN cDNA 2700050C12 gene):
(9) ETB {Endotheiin type B receptor);
(10) MSG783 {RNF124, hypothetical protein FLJ20315);
(I I) STEAP2 (HGNC_8639, IPCA-1 , PCANAP1 , STAMP 1 , STEAP2, STMP, prostate cancer associated gene 1 , prostate cancer associated protein 1 , six
transmembrane epithelial antigen of prostate 2, six transmembrane prostate protein);
(12) TrpM4 (8R22450, FLJ20041 , TRPM4, TRPM4B, transient receptor potential cation channel, subfamily , member 4);
(13) CR!PTO (CR, CR1 , CRGF, CRiPTO, TDGF1 , teratocarcinoma-derived growth factor);
(14) CD21 (CR2 (Complement receptor 2) or C3DR (C3d/Epstein Barr virus receptor) or Hs 73792);
(15) CD79b (CD79B, CD79j5, SGb (irnmunoglobulin-associated beta), B29);
(16) FcRH2 (IFGP4, IRTA4, SPAP1 A (SH2 domain containing phosphatase anchor protein 1a), SPAP1 B, SPAP1 C);
(17) HER2;
(18) NCA;
(19) MDP;
(20) IL20Ra;
(21) Brevican;
(22) EphB2R;
(23) ASLG659; (24) PSCA;
(25) GEDA;
(26) BAFF-R (B cell -activating factor receptor, BLyS receptor 3, BR3);
(27) CD22 (B-cell receptor CD22-B isoform);
(28) CD79a (CD79A. CD79«., immunoglobulin-associated alpha);
(29) CXCR5 (Burkitt's lymphoma receptor 1 );
(30) HLA-D08 (Beta subunit of iviHC class II molecule (la antigen));
(31 ) P2X5 (Purinergic receptor P2X ligand-gated ion channel 5);
(32) CD72 (B-ceif differentiation antigen CD72, Lyb-2);
(33) LY64 (Lymphocyte antigen 64 (RP105), type I membrane protein of the leucine rich repeat (LRR) family);
(34) FcRH1 (Fc receptor-like protein 1 );
(35) IRTA2 (Immunoglobulin superfamily receptor translocation associated 2); and
(36) TENB2 (putative transmembrane proteoglycan).
24. The conjugate of claim 2 wherein the antibody or antibody fragment is a cysteine- engineered antibody.
25. The conjugate of either claim 21 or claim 24 wherein the antibody or antibody fragment is an antibody which binds to an ErbB receptor.
26. The conjugate of claim 25 wherein the antibody is trastuzumab.
27. The conjugate of either claim 21 or claim 24 wherein Ab is an anti-HER2, an anti- Steapl , or an anti-CD22 antibody.
2S. The conjugate according to claim 21 wherein the drug loading (p) of drugs (D) to antibody (Ab) is an integer from 1 to about 8. 29. The conjugate according to claim 28, wherein p is 1 , 2, 3, or 4.
30. The conjugate according to claim 28 comprising a mixture of the antibody-drug conjugate compounds, wherein the average drug loading per antibody in the mixture of antibody-drug conjugate compounds is about 2 to about 5.
31. The conjugate according to any one of claims 1 to 30, for use in therapy.
32. The conjugate according to any one of claims 1 to 30, for use in the treatment of a proliferative disease in a subject. 33. The conjugate according to claim 31 wherein the disease is cancer.
34. A pharmaceutical composition comprising the conjugate of any one of claims 1 to 30 a pharmaceutically acceptable diluent, carrier or excipient. 35. The pharmaceutical composition of claim 34 further comprising a therapeutically effective amount of a chemotherapeutic agent.
36. Use of a conjugate according to any one of claims 1 to 30 in the preparation of a medicament for use in the treatment of a proliferative disease in a subject.
37. A method of treating cancer comprising administering to a patient the pharmaceutical composition of claim 36.
38. The method of claim 37 wherein the patient is administered a chemotherapeutic agent, in combination with the conjugate.
39. Use of a conjugate according to any one of claims 1 to 30 to provide a compound of formula (B) at a ta
Figure imgf000115_0001
B
and salts and solvates thereof.
40. The use according to claim 39, wherein the target location is a proliferative cell population.
41. Use of a conjugate according to any one of claims 1 to 30 to provide a compound of formula (C) at a ta
Figure imgf000116_0001
and salts and solvates thereof, wherein
Q is independentiy selected from 0, S and NH; and
R" is either H, or R or, where Q is O, SQ- , where M is a metal cation.
A compound of formula (E)
Figure imgf000116_0002
D
and salts and solvates thereof, wherein
the dotted lines indicate the optional presence of a double bond between C1 and C2 or C2 and C3; R2, R6, R7, R9, R12, R16, R17, R19, X, X', R", Y, RL1 and RL2 are as defined in any one of claims 1 to 20.
43.
Figure imgf000117_0001
44. The com ound of claim 43, which is:
Figure imgf000117_0002
45. A method of preparing a conjugate according to any one of claims 1 to 30, the meihod comprising the step of reacting a ce!i binding agent with compound (D) as defined in any one of claims 42 to 44.
46. An article of manufacture comprising a pharmaceutical composition of claim 35; a container; and a package insert or label indicating that the pharmaceutical composition can be used to treat cancer.
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PT2750713E (en) 2016-01-20
DK2750713T3 (en) 2015-12-21
SI2750713T1 (en) 2016-01-29
EP2750713A1 (en) 2014-07-09
MX2014004434A (en) 2014-09-22
CN103987407B (en) 2016-08-24
CA2850371A1 (en) 2013-04-18

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