EP2448929A1 - Nouveaux conjugues, leur preparation et leur application en therapeutique - Google Patents

Nouveaux conjugues, leur preparation et leur application en therapeutique

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Publication number
EP2448929A1
EP2448929A1 EP10728799A EP10728799A EP2448929A1 EP 2448929 A1 EP2448929 A1 EP 2448929A1 EP 10728799 A EP10728799 A EP 10728799A EP 10728799 A EP10728799 A EP 10728799A EP 2448929 A1 EP2448929 A1 EP 2448929A1
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Prior art keywords
group
gcr
compound
alkyl
cri
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German (de)
English (en)
French (fr)
Inventor
Hervé Bouchard
Marie-Priscille Brun
Alain Commerçon
Jidong Zhang
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Sanofi SA
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Sanofi SA
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D273/00—Heterocyclic compounds containing rings having nitrogen and oxygen atoms as the only ring hetero atoms, not provided for by groups C07D261/00 - C07D271/00
    • C07D273/08—Heterocyclic compounds containing rings having nitrogen and oxygen atoms as the only ring hetero atoms, not provided for by groups C07D261/00 - C07D271/00 having two nitrogen atoms and more than one oxygen atom
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A61K31/496—Non-condensed piperazines containing further heterocyclic rings, e.g. rifampin, thiothixene or sparfloxacin
    • 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
    • C07D245/00—Heterocyclic compounds containing rings of more than seven members having two nitrogen atoms as the only ring hetero atoms
    • C07D245/04—Heterocyclic compounds containing rings of more than seven members having two nitrogen atoms as the only ring hetero atoms condensed with carbocyclic rings or ring systems
    • C07D245/06—Heterocyclic compounds containing rings of more than seven members having two nitrogen atoms as the only ring hetero atoms condensed with carbocyclic rings or ring systems condensed with one six-membered ring

Definitions

  • the present invention relates to conjugates of cryptophycins, the compositions containing them and their therapeutic application, especially as anticancer agents.
  • the invention also relates to the process for preparing these compounds as well as to the cryptophycin derivatives themselves. [Technical area]
  • Cryptophycins are secondary metabolites belonging to the class of depsipeptide macrocycles produced by cyanobacteria of the genus Nostoc. Their name refers to the fact that they are highly cytotoxic to cryptococcal yeasts.
  • the first representative of this class of molecules, cryptophycin-1 (C-1) was isolated in 1990 from cyanobacterium Nostoc sp (ATCC 53789) (see Ei ⁇ ler S., et al., Synthesis 2006, 22, 3747-3789 ).
  • the structure, the general formula and the numbering of the carbon atoms of these compounds, as described in WO 98/08505, are given below:
  • Cryptophycins C-1 and C-52 which are characterized by an epoxide function shown below, have anticancer properties.
  • Phase II clinical trials in lung cancer were conducted with C-52 (LY 355073): see Edelman MJ. , et al., Lung Cancer 2003,
  • Cryptophycin C-55 a C-52 prodrug, is characterized by a chlorohydrin function instead of the epoxide function (Bionpally R.R., et al., Cancer Chemother Pharmacol 2003, 52, 25-33).
  • C-55 has been very active but is not stable in solution.
  • Chlorhydrin glycinate derivatives such as the compound C-55 Gly have also been described to improve their stability.
  • Conjugate chemistry has been known for many years and has been applied to several cytotoxic families, for example maytansinoids (WO 04103272), taxanes (WO 06061258), tomaymycins (WO 09016516), leptomycins (WO 07144709), CC-1065 and its analogs (WO 2007102069); see also about conjugates, Monneret C, et al., Cancer Bulletin. 2000, 87 (1 1), 829-38; Jamaicart A.D., et al., Nature Clinical Practice Oncology 2007, 4, 245-255. However, it has not been applied to cryptophycin derivatives conjugated to antibodies or other targeting agents.
  • the technical problem to be solved by the present invention is to propose novel conjugates based on cryptophycin derivatives, as well as novel cryptophycin derivatives capable of being conjugated.
  • EP 0830136 and WO 98/08505 describe cryptophycin derivatives but do not describe cryptophycin conjugates.
  • WO 98/08505 discloses cryptophycin derivatives of formula
  • R 54 is H, (C 1 -C 6 ) alkyl, (C 1 ;
  • ⁇ JaJkyJeORiQQ, SR 63 ; R 55 and R 56 represent H, a (C 1 -C 6 ) alkyl group,
  • WO 08010101 discloses an anti-EphA2 monoclonal antibody and the corresponding conjugates comprising one or more molecules of a cytotoxic compound attached to the monoclonal antibody.
  • WO 08047242 discloses an anti-CD38 monoclonal antibody as well as the corresponding conjugates comprising one or more molecules of a cytotoxic compound attached to the monoclonal antibody.
  • the cytotoxic compound may be selected from maytansinoids, taxanes, tomaymycins, leptomycins, CC-1065 and its analogs.
  • WO 2009/126934 discloses anti-CD70 antibodies and their conjugates with cytotoxic compounds; cryptophycin is cited among the cytotoxics.
  • WO 2009/134976 discloses conjugates with an optimized substitution rate to deliver the required amount of cytotoxic to the cell; cryptophycin is cited among the cytotoxics.
  • WO 2005/116255 discloses aptamer conjugates and a cytotoxic which may be a cryptophycin (see [0037] and Table 2), the linker may comprise a PEG chain ([0038]). More particularly, Cryptophycin Cryp-NH 2 is described:
  • WO 2006/096754 also describes aptamer conjugates and a cytotoxic which can also be a cryptophycin.
  • WO 2009/002993 discloses cytotoxic conjugates of formula BLA comprising hydrophilic linkers, for example the linker of formula:
  • the cytotoxic may be a cryptophycin (page 46) but without specifying the point of attachment of the linker.
  • An example of a conjugate is EC0262:
  • Conjugate a cell targeting agent to which at least one molecule of a cytotoxic compound is covalently attached;
  • Cell targeting agent (or "cell binding agent” in English): a molecule having an affinity for a biological target: it may be for example a ligand, a protein, an antibody, more particularly monoclonal, a protein or antibody fragment, a peptide, an oligonucleotide, an oligosaccharide.
  • the targeting agent has the function of directing the biologically active compound as a cytotoxic agent to the biological target.
  • the targeting agent is not an aptamer;
  • biological target an antigen (or group of antigens) preferentially localized on the surface of the cancerous cells or stromal cells associated with this tumor; such antigens may be, for example, a growth factor receptor, a mutant tumor suppressor or "tumor suppressor” product, a molecule related to angiogenesis, an adhesion molecule;
  • linker a set of atoms to covalently attach a cytotoxic compound to the targeting agent
  • Alkyl group a saturated aliphatic hydrocarbon group obtained by removing a hydrogen atom from an alkane.
  • the alkyl group can be linear or branched.
  • Cycloalkyl group a cyclic alkyl group comprising between 3 and 8 carbon atoms engaged in the cyclic structure.
  • cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl groups By way of examples, mention may be made of cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl groups;
  • Heterocycloalkyl group a cycloalkyl group comprising at least one heteroatom (O, S, N) engaged in the ring and connected to the carbon atoms forming the ring;
  • Alkoxy group an -O-alkyl group, wherein the alkyl group is as defined above;
  • Alkanoyloxy group a group -O-CO-alkyl, where the alkyl group is as defined above;
  • Alkylene group a saturated divalent group of the formula -C n H 2n -, obtained by removing two hydrogen atoms from an alkane.
  • methylene groups -CH 2 -
  • ethylene -CH 2 CH 2 -
  • propylene -CH 2 CH 2 CH 2 -
  • butylene -CH 2 CH 2 CH 2 CH 2 -
  • AA 'hexylene (-CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 -) or the following branched groups n , / x ;
  • the alkylene group is of the formula - (CH 2 ) n -, n represents an integer;
  • the terminals are included (eg a range of "n from 1 to 6" or “from 1 to 6” includes terminals 1 and 6).
  • AcOEt ethyl acetate
  • ALK (C 1 -C 12 ) alkylene group, more particularly (C 1 -C ⁇ ) alkylene, more particularly of the form - (CH 2 ) n - n being an integer of 1 to 12, preferably 1 to 6
  • TLC thin layer chromatography
  • Fmoc fluorenylmethoxycarbonyl
  • HOBt 1-hydroxybenzotriazole
  • HEPES 4- (2-hydroxyethyl) -1-piperazine-ethanesulfonic acid
  • mCPBA m-chloroperbenzoic acid
  • NHS N-hydroxysuccinimide
  • NMP N-methylpyrrolidinone
  • PA atmospheric pressure
  • PABAC "para-aminobenzylic alcohol carbonate"
  • PR reduced pressure
  • SEC chromatography steric exclusion
  • SPE solid phase extraction
  • TA room temperature
  • TBDMS tert-butyldimethylsilyl
  • TCEP tris- (2-carboxyethyl) -phosphine hydrochloride
  • TEA triethylamine
  • TFA trifluoroacetic acid
  • TIPS triisopropylsilyl
  • THF tetrahydrofuran
  • t R retention time.
  • the invention relates to a targeting agent to which at least one cryptophycin derivative of formula (I) is attached:
  • R 1 represents a halogen atom and R 2 represents an -OH group, an acyl group derived from an amino acid AA or a (C 1 -C 4 ) alkanoyloxy group;
  • R 1 and R 2 together form an epoxy unit
  • AA means a natural or unnatural amino acid
  • R3 represents a group (C 1 -C ⁇ alkyl
  • R ⁇ and R 7 represent independently of each other H or a group (C 1 -C ⁇ alkyl);
  • R 1 0 represents at least one substituent of the phenyl ring selected from: H, -OH, (C 1 -C 4) alkoxy, a halogen atom or -NH 2, -NH (d-C6 ) alkyl or -N (Cr C 6 ) alkyl 2 ;
  • Rn represents at least one substituent of the phenyl ring selected from H or a (Cr C 4 ) alkyl group;
  • the targeting agent and the cryptophycin derivative being covalently attached, the attachment being in the ortho (o), meta (m) or para (p) position of the phenyl ring bearing the CRi motif. positions ortho (o), meta (m) or para (p):
  • R 1 represents a halogen atom, more particularly Cl.
  • R 3 represents a group (Cr C ⁇ jalkyl, more particularly Me, Re and R 7 represent independently of each other H or a group (C 1 -C ⁇ ) alkyl, more particularly they represent independently of one another H or a group Me.
  • Rs and R 9 represent independently of each other H or a group (Cr C ⁇ alkyl), more particularly R 8 represents H and R 9 represents isobutyl.
  • Rio represents at least one substituent of the phenyl ring selected from H, an OH group, (Cr C 4 ) alkoxy, a halogen atom. It can also be a group -NH 2 , -NH (C 1 -C 6 ) alkyl or - N (C 1 -C 6 ) alkyl 2 such as for example -NH 2 or -NMe 2 , preferably in position 3 or 4 on the phenyl nucleus. More particularly, the phenyl ring comprises two substituents at the 3- and 4-positions on the phenyl ring. Preferably it is 3-Cl and 4-methoxy. Rn represents at least one substituent of the phenyl ring selected from H or a (C 1 -C 4 ) alkyl group; more particularly H.
  • each substituent R 1 to R n may also adopt one of the spatial configurations (for example R or S or else Z or E) as described in the examples.
  • AA represents a natural or unnatural amino acid. It can be an amino acid ⁇ , ⁇ or ⁇ . Mention may in particular be made of the following amino acids: alanine (Ala), ⁇ -alanine, 2-amino-2-cyclohexylacetic acid, 2-amino-2-phenylacetic acid, arginine (Arg), aspartic acid (Asp), cysteine (Cys ), glutamine (Gln), glutamic acid (Glu), glycine (Gly), histidine (His), isoleucine (Ile), leucine (Leu), lysine (Lys), methionine (Met), phenylalanine (Phe), praline ( Pro), serine (Ser), threonine (Thr), tryptophan (Trp), tyrosine (Tyr), valine (Val), ⁇ -aminobutyric acid, ⁇ , ⁇ -dimethyl ⁇ -aminobutyric acid,
  • Ri and R 2 may also together form an epoxy unit.
  • the attachment between the cryptophycin derivative and the targeting agent is carried out via a linker L positioned in the ortho (o), meta (m) or para (p) position of the phenyl ring bearing the CR-unit. i; thus, the conjugatable cryptophycin derivative has the formula (II):
  • (H) Attachment at the level of the targeting agent is at the other end of linker L at a reactive group present on the targeting agent.
  • L comprises at least one reactive chemical group (GCR1) with respect to a reactive chemical group (GCR2) present on the targeting agent.
  • GCR1 and GCR2 ensures the attachment of the compound of formula (II) to the targeting agent by formation of a covalent bond.
  • the cryptophycin derivative of formula (II) is capable of being conjugated to a targeting agent.
  • the cryptophycin derivatives of the present invention may exist in the form of bases or addition salts with acids, in particular pharmaceutically acceptable acids.
  • GCR1 As examples of GCR1, mention may be made of:
  • R 2 representing H or a (C 1 -C 6 ) alkyl group, more particularly Me; or l
  • the maleimido reactive group with R 2 representing H or a (C 1 -C 6 ) alkyl group, more particularly Me. More particularly, -SZ a may represent -SH or -SS (C 1 -C 6 ) alkyl, especially -SSMe, or -
  • Gl represents at least one electroinductive group such as -NO 2 or -HaI, especially -F. It may be for example
  • GCR1 may be chosen from one of those described in the examples.
  • GCR2 mention may be made of the ⁇ -amino groups of the lysines carried by the side chains of the lysine residues which are present on the surface of an antibody, the saccharide groups of the hinge region or thiols of cysteines by reduction of intra-chain disulfide bonds (Garnett M.C. et al., Advanced Drug Delivery Reviews 2001, 53, 171-216).
  • the modifying agent may be an NHS activated ester of formula in which R represents a (C 1 -C 6 ) alkyl, aryl, heteroaryl or (C 3 -C 7 ) cycloalkyl group, (C 3 - C 7 ) heterocycloalkyl and ALK represents a (C 1 -C 6) alkylene group, for example, N-succinimidyl pyridyldithiopropionate (SPDP) or N-succinimidyl pyridyldithiobutyrate (SPDB or N-hydroxy-succinimidyl ester of 4- (2-pyridyldithio) butanoic) to introduce dithiopyridyl GCR2 reactive groups (see Bourdon MA, et al., Biochem J.
  • SPDP N-succinimidyl pyridyldithiopropionate
  • SPDB N-succinimidyl pyrid
  • X 3 , X 4 , X 5 , Xe represent H or a group (C 1 -C 6 alkyl),
  • - Xi and X 2 represent -H, -CONX 8 Xg, -NO 2 , Xs and X 9 represents H or a (C 1 -C 6 ) alkyl group, - X 7 represents -S ⁇ 3 -M + or H or a quaternary ammonium group
  • a represents an integer ranging from 0 to 4 and b denotes an integer ranging from 0 to 2000, preferably from 1 to 200; a and b can take any value between 0 and 4 or between 0 and 2000, respectively.
  • succinimidyl-4- (N-maleimidomethyl) cyclohexane-1-carboxylate SMCC
  • SMCC succinimidyl-4- (N-maleimidomethyl) cyclohexane-1-carboxylate
  • sulfo-SMCC 4- (N-maleimidomethyl) cyclohexane sulfosuccinimidyl) -1-carboxylate
  • N-succinimidyl 3-maleimido-propanoate such as N-succinimidyl 6- (3-maleimidopropionamido) hexanoate
  • b is an integer between 0 and 2000, preferably between 1 and 200 (b can take any value between 0 and 2000), such as 3- (2- ⁇ 2- [3-maleimido-propionylamino] -ethoxy ⁇ -ethoxy) -N-succinimidylpropanoate or MS (PEG) 2 ; such as maleimidoethyl succinate and N-succinimidyl succinate;
  • modifying agent described in WO 90/06774 is of formula in which :
  • - HaI represents a halogen atom
  • - X 10 represents a halogen atom or COOXi 4, nitro, (C 1 -C 8) unsubstituted or halogenated alkyl, (C 1 -C 8) alkoxy unsubstituted or halogen, (C 2 -C 8) unsubstituted or halogenated alkenyl, (C 2 -C 8 ) unsubstituted or halogenated alkynyl, (C 3 -C 8 ) unsubstituted cycloalkyl, aryl unsubstituted or substituted with one to three substituents selected from amino, halogen, group (C 1 -C 8 ) unsubstituted or halogenated alkyl, (C 1 -C 8 ) unsubstituted or halogenated alkoxy;
  • each of Xn, X 12 , X 13 independently represents a hydrogen atom or may represent X 3 ;
  • X 10 and X 11 together form a (C 2 -C 5 ) alkylene ring, unsubstituted or substituted with one to five (C 1 -C 4 ) alkyl group (s);
  • X 14 is -H or a (C 1 -C 8 ) alkyl group.
  • HaI represents a chlorine or bromine atom.
  • SIA iodoacetate
  • SBA succinimidyl-N-bromoacetate
  • SBAP succinimidyl-3- (N-bromoacetamido) propionate
  • Figures 1 and 2 illustrate modification of an amino group of a targeting agent by SPDP or by the preferred iminothiolane above.
  • GCR1 represents -SH
  • reaction between GCR1 and GCR2 is a cleavable disulfide bond.
  • targeting agent of GCR2 groups of maleimido type ( ) or haloacetamido eg bromo- or iodoacetamido Reciprocally, can be introduced on the targeting agent
  • GCR2 thiol groups (-SH), e.g. with an iminothiolane, in the case where GCR1 represents I
  • GCR2 is a non-cleavable sulfide bond.
  • GCR1 is of type (iii) above
  • a suitable modifying agent or to introduce acid (s) non-natural amine (s) in order to introduce the appropriate GCR2 functions.
  • GCR2 can be a group -C ⁇ CH
  • GCR 2 can be a carboxylic acid function
  • GCR2 can be a group -SH.
  • the cryptophycin derivative may be represented by the formula (IIa) or (Nb) below:
  • the cryptophycin derivative may be, in series C-52 and C-1, one of the following D 1 -D 8 :
  • L is in the para position of the CR-i motif.
  • the function of the PL linker precursor is to introduce the L linker at the level of the cryptophycin derivative after reaction between the group G and a chemical function present on PL.
  • G can also represent the group 2 n ⁇ (that is, Y represents the group
  • the deprotection can be carried out by treatment with a palladium catalyst, for example Pd (PPh 3 ) 4 in the presence of a "scavenger" amine, for example morpholine; activation can be carried out with N-N'-disuccinimidyl carbonate in the presence of a base, for example DIPEA or with NHS in the presence of a coupling agent, for example DCC.
  • a palladium catalyst for example Pd (PPh 3 ) 4
  • a "scavenger" amine for example morpholine
  • activation can be carried out with N-N'-disuccinimidyl carbonate in the presence of a base, for example DIPEA or with NHS in the presence of a coupling agent, for example DCC.
  • Figure 1 These derivatives are obtained by reaction between a cryptophycin derivative having a linker L 'comprising an amino or thiol group and a modifying agent for introducing a maleimido or haloacetamido group, respectively.
  • Nucleophilic substitution between a PL linker precursor carrying an amino function -NH- (an amine salt may also be suitable) and G - (CH 2 ) n CI or - (CH 2 ) n OMs (see, for example, . Table II, 1-4 PL, PL 7a, PL 8- IO PL21-23): this reaction may be conducted in an aprotic polar solvent in the presence of a base, such as TEA or DIPEA. See ex.1, compound 7 or ex.15, compound 48;
  • the linker L can be chosen from one of the following:
  • G represents a group - (CH 2 ) n -;
  • n an integer from 1 to 6;
  • X represents a single bond or a group -CO-, -COO-, or -CONR 12- , the group CO being attached to G ';
  • Y represents -O-, -OCO-, -OCOO-, -OCONR 12 -, -NR 12 -, -NR 12 CO-, -NR 12 CONR '12 -, - NR 12 COO-, or -S (0 q -, the atom O or the group NR 12 being attached to G ";
  • Y ' represents a group -O-, -OCO-, -OCOO-, -OCONR 12 -, -NR 12 -, -NR 12 CO-, -NR 12 CONR' 12 -, -
  • R12, R'i2, R13, Ru, R15 and R 16, R 17 and R 18 independently of one another H or (C 1 -C ⁇ Jalkyle;
  • t, u and y represent integers ranging from 0 (case of the absent group) to 20 and such that t + u + y is greater than or equal to 1;
  • q represents an integer that may be 0, 1 or 2;
  • Q represents a single bond, a (C 1 -C -alko) alkylene group or a (OCH 2 CH 2 ) group, i being an integer ranging from 1 to 20, more preferably from 1 to 10, more particularly from 1 to at 8, or from 1 to 6, even more particularly from 2 to 5. i can take each of the values of these ranges, in particular worth 2, 3, 4 or 5.
  • the linker L may be chosen from one of those of formula (IV):
  • W represents an integer ranging from 1 to 12, preferably from 1 to 6;
  • N represents an integer ranging from 1 to 6;
  • R 12 represents H or a group (C 1 -C ⁇ alkyl);
  • R19, R20, R21, R22 represent independently of each other H, an atom
  • T attached to (CH 2 ) n represents NR 12 OR O;
  • V 1 represents O, S, NR 12 ;
  • V 2 represents CR 22 or N
  • V 3 , V 4 , V 5 are chosen independently of one another from CR 22 or N.
  • AA denotes a natural or non-natural amino acid, more particularly chosen from: alanine (Ala), ⁇ -alanine, 2-amino-2-cyclohexylacetic acid, 2-amino-2-phenylacetic acid, arginine (Arg), aspartic acid (Asp), cysteine (Cys), glutamine (Gln), glutamic acid (Glu), glycine (Gly), histidine (His), isoleucine (Ile), leucine (Leu), lysine (Lys), methionine (Met), phenylalanine (Phe), proline (Pro), serine (Ser), threonine (Thr), tryptophan (Trp), tyrosine (Tyr), valine (Val), ⁇ -aminobutyric acid, ⁇ , ⁇ -dimethyl ⁇ -aminobutyric acid, ⁇ , ⁇ -dimethyl ⁇ -aminobutyric acid, ⁇ ,
  • sequence (AA) W has the formula: wherein R 23 represents a residue of one of the amino acids described above.
  • sequences are the following: Gly-Gly, Phe-Lys, Val-Lys, Val-Cit, Phe-Phe-Lys, D-Phe-Phe-Lys, Gly-Phe-Lsy, Ala-Lys, Val -Cit, Phe-Cit, Leu-Cit, Ile-Cit, Trp-Cit, Phe-Ala, Ala-Phe, Gly-Gly-Gly, Gly-Ala-Phe, Gly-Val-Cit, Gly-Phe-Leu -Cit, Gly-Phe-Leu-Gly, Al-Leu-Ala-Leu.
  • linker precursors are those comprising the corresponding -OH units:
  • WO 2005/082023 (see especially pages 61-64) describes how to obtain certain linker precursors.
  • the preparations of the PL25 and PL26 linker precursors described hereinafter can also be used to obtain other similar linker precursors comprising a further sequence (AA) W.
  • the linker L may also be selected from one of those described in Table II or from the exemplified compounds. In all linkers of formulas, NR 12 or NR 12 more particularly represents NH or NMe.
  • Pi is prepared according to information from WO 98/08505, WO 00/23429 or WO 00/34252 and the following publications Rej R., et al., J. Org. Chem. 1996, 61, 6289-6295; Salamonczyk G. M., et al., J. Org. Chem. 1996, 61, 6893-6900 or J. Med. Cftem. 1999, 42 (14), 2588-2603 (incorporated herein by reference).
  • an acidic medium for example, concentrated perchloric acid may be used;
  • 4- (Triisopropylsiloxymethyl) benzyltriphenylphosphonium bromide is obtained from 1- (bromomethyl) -4- (triisopropylsiloxymethyl) benzene (CAS No. 934667-38-6), the preparation of which is prepared from 1,4-benzenedimethanol (CAS N No. 589-29-7, commercial product) is described by Potier R. G, et al., Organic Letters 2007, 9 (7), 1187-1190.
  • Rn represents a (C 1 -C 4 ) alkyl group
  • diol which is either a commercial product or is obtained by C-alkylation Friedel-Crafts from 1,4-benzenedimethanol. .
  • C 4 ) alkyl are similarly obtained from a compound equivalent to compound 1 described on page 83 of the Nevill CR article. Jr., et al., Bioorganic & Med. Chem. Lett. 1991, 7 (1), 83-86 which is either a commercial product or is obtained by Friedel-Crafts C-alkylation from p-tolylacetic acid.
  • Triphenyl (p-vinylbenzyl) phosphonium bromide (CAS No. 1 18766-51-1) is obtained from the corresponding brominated derivative (see Drefahl G., et al., Chem.Ber., 1961, 94 (8), 2002-2010) whose preparation from 4-vinylbenzyl alcohol (CAS No. 1074-61-9, commercial product) is described in the article by Shimomura O., et al., Tetrahedron 2005, 61, 12160 -12,167.
  • the groups G-CH 2 CI or -CH 2 N 3 can be obtained: the introduction of -Cl can be carried out in the presence of CMS: see ex.1 -composed 2;
  • the group G -CH 2 NH 2 can be obtained by means of a reduction reaction using a phosphine such as TCEP.
  • a phosphine such as TCEP.
  • the group G-CH 2 NH 2 can be obtained by means of a Mitsunobu reaction using triphenylphosphine and DEAD.
  • a Mitsunobu reaction using triphenylphosphine and DEAD see: Mitsunobu O., Synthesis 1981, 1-28; Hughes DL, Org. Reactions 1992, 42, 335-656; Hughes DL, Org. Prep. 1996, 28, 127-164.
  • Schemes 5 and 5 'describe the case n 1 but they can also apply for n> 1.
  • the intermediate dimer of formula can be formed:
  • a suitable Grignard reagent for example a protected alkoxymagnesium bromide in the form of silylated ether
  • (4-Bromobenzyl) triphenylphosphonium bromide is a commercial product (CAS No. 51044-13-4).
  • the protected alkoxymagnesium bromides in the form of silylated ether can be prepared from the corresponding bromoalcohols by protecting the alcohol function with the appropriate chlorosilane and then by forming the organomagnesium in the presence of magnesium in an aprotic polar solvent anhydrous, such as THF. (see for example Organic Letters 2005, 7, 183-186).
  • Bromoalcohols, linear or branched having 1 to 6 carbon atoms, are commercially available, such as 3-bromo-1-propanol (CAS No.
  • chlorosilane may, for example, be tert-butyldimethylchlorosilane (CAS No. 18162-48-6) or triisopropylchlorosilane (CAS No. 13154-24-0).
  • G-CH 2 N 3 the conversion of -CH 2 OH to -CH 2 N 3 can be carried out in an aprotic polar solvent in the presence of diphenylphosphorazide and a base such as DBU, see Example 19, compound 60.
  • PL can be one of the following:
  • a coupling agent such as, for example, 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride in solution in an anhydrous aprotic solvent such as DCM.
  • a base which may be a tertiary amine such as TEA or DIPEA.
  • the solvent may be DMF.
  • acid for example hydrochloric acid (eg in solution in dioxane).
  • the starting acid for example 4-methyl-4- (methyldithio) -pentanoic acid
  • a reducing agent such as, for example, sodium cyanoborohydride.
  • an acid solution for example hydrochloric acid (eg in solution in dioxane).
  • the starting aldehyde for example 2-methyl-2- (methyldithio) propanal
  • a suitably protected halogenated alcohol for example as a silyl ether
  • a protic polar solvent such as ethanol
  • O-methylhydroxylamine hydrochloride under reflux
  • a base such as sodium hydroxide
  • a borane dimethylsulfide solution in an anhydrous aprotic polar solvent such as THF.
  • a reducing agent such as, for example, sodium triacetoxyborohydride.
  • This linker is prepared similarly to what is presented for PL 2 .
  • anhydrous aprotic polar solvent such as THF
  • a reducing agent such as sodium cyanoborohydride.
  • the conditions of Example 5, compound 17 can be used.
  • an acid solution for example hydrochloric acid (for example in solution in the dioxane).
  • an aprotic polar solvent such as DCM
  • a phosphine for example triphenylphosphine
  • anhydrous protic polar solvent such as methanol
  • a base such as, for example, sodium methanolate
  • a reagent having a pyridyl disulfide unit is formed of the disulfide bond; the reaction is carried out in an anhydrous protic polar solvent such as methanol in the presence of a base such as, for example, sodium methanolate and a reagent having a pyridyl disulfide unit.
  • anhydrous aprotic polar solvent such as DCM
  • mesyl chloride in the presence of a base such as, for example, TEA.
  • a protic polar solvent such as an ethanol / water mixture
  • a protic polar solvent such as ethanol
  • an acid solution for example hydrochloric acid (eg in solution in dioxane).
  • p U RbZb-ALK-OC (OCH 2 CH 2) -OH is prepared
  • a hydrochloric acid solution eg, dioxane solution
  • trifluoroacetic acid e.g, trifluoroacetic acid
  • an aprotic polar solvent such as DMF
  • a base such as potassium carbonate
  • anhydrous aprotic polar solvent such as THF
  • anhydrous aprotic polar solvent such as THF or DMF
  • a halogenated ester with the alcoholate of a monoprotected PEG diol in the form of tetrahydropyran ether (THP).
  • THF tetrahydropyran ether
  • ⁇ are diagrams below. d esS0US!
  • hydrochloric acid eg, dioxane solution
  • trifluoroacetic acid e.g, trifluoroacetic acid
  • anhydrous aprotic polar solvent such as THF
  • a base such as NaH
  • a nucleofugal group such as an alkyl halide
  • anhydrous aprotic polar solvent such as THF or DMF
  • an aprotic polar solvent such as DCM
  • a Lewis acid such as BF 3 etherate.
  • hydrochloric acid eg, dioxane solution
  • trifluoroacetic acid we can draw inspiration from the conditions of Example 16, compound 50.
  • an aprotic polar solvent such as DMF
  • a base such as potassium carbonate
  • anhydrous aprotic polar solvent such as THF or DMF
  • a halogenated ester with the alcoholate of a monoprotected PEG diol in the form of tetrahydropyran ether (THP).
  • THF tetrahydropyran ether
  • PEG alcohols with a protected acid function in the form of a tert-butyl ester are commercially available (such as tert-butyl 12-hydroxy-4,7,10-trioxadodecanoate) or prepared from F-butyl acrylate and a PEG diol.
  • an acid solution for example hydrochloric acid (eg in solution in dioxane).
  • an aprotic polar anhydride solvent such as DCM
  • a base such as TEA
  • an aprotic polar solvent such as DCM
  • a coupling agent such as EDCI
  • a base such as DMAP
  • a hydrochloric acid solution eg, dioxane solution
  • an aprotic polar solvent such as DCM
  • a coupling agent such as the DIC / HOBt system.
  • ALK - (CH 2 ) i-6- (such as 1,6-hexanedioic acid monomethyl ester).
  • aprotic polar solvent such as DCM
  • an aprotic polar solvent such as DCM
  • Step (i): Following step (iii), the reactions of step (i) are repeated for the case R 12 H. case where ALK ⁇ CHpCH?
  • anhydrous aprotic polar solvent such as THF or DMF
  • a Lewis acid such as BF 3 etherate.
  • anhydrous aprotic polar solvent such as DCM
  • mesyl chloride in the presence of a base such as TEA.
  • an aprotic polar solvent such as acetone
  • a sodium halide such as sodium iodide.
  • hydrochloric acid eg, dioxane solution
  • trifluoroacetic acid e.g, trifluoroacetic acid
  • THF tetrahydropyran ether
  • the preparation of this type of monoprotected PEG diol is well described in the literature, see for example Richard A. et al. Chem. Eur. J. 2005, 11, 7315-7321 or Sakellariou E.G., et al. Tetrahedron 2003, 59, 9083-9090.
  • the intermediate formed is hydrolyzed selectively at pH 5 to the hydroxy ester.
  • PEG alcohols with a protected acid function in the form of a tert-butyl ester are commercially available (such as tert-butyl 12-hydroxy-4,7,10-trioxadodecanoate) or prepared from F-butyl acrylate and a PEG diol.
  • a hydrochloric acid solution eg, dioxane solution
  • trifluoroacetic acid e.g, trifluoroacetic acid
  • an aprotic polar solvent such as methanol
  • a protic polar solvent such as a two-stage ethanol / water mixture successive: displacement of the mesylate by thiourea then hydrolysis in situ of the isothiouronium salt by addition of a base such as sodium hydroxide.
  • anhydrous aprotic polar solvent such as THF
  • THF anhydrous aprotic polar solvent
  • THF tetrahydropyran ether
  • PEG alcohols with a protected acid function in the form of a fert-butyl ester are commercially available (such as Fert-butyl 12-hydroxy-4,7,10-trioxadodecanoate) or prepared from F-butyl acrylate and a diol
  • anhydrous aprotic polar solvent such as THF
  • hydrochloric acid eg, dioxane solution
  • trifluoroacetic acid trifluoroacetic acid
  • an aprotic polar solvent such as methanol
  • an aprotic polar solvent such as DCM
  • a coupling agent such as EDCI
  • a base such as DMAP
  • THF anhydrous aprotic polar solvent
  • THF tetrahydropyran ether
  • a base such as NaH
  • an alkynyl halide such as propargyl bromide or 4-bromo-1-butyne.
  • THF tetrahydropyran ether
  • the preparation of this type of monoprotected PEG diol is well described in the literature, see for example Richard A. et al. Chem. Eur. J. 2005, 11, 7315-7321 or Sakellariou E.G., et al. Tetrahedron 2003, 59, 9083-9090.
  • PEG alcohols with a protected acid function in the form of a tert-butyl ester are commercially available (such as tert-butyl 12-hydroxy-4,7,10-trioxadodecanoate) or prepared from F-butyl acrylate and a PEG diol.
  • anhydrous aprotic polar solvent such as THF
  • hydrochloric acid eg, dioxane solution
  • trifluoroacetic acid e.g, trifluoroacetic acid
  • TA in an aprotic polar solvent such as DCM by treatment with NHS in the presence of a coupling agent such as DCC supported.
  • an aprotic polar solvent such as acetone
  • TA in an aprotic polar solvent such as DCM by treatment with NHS in the presence of a coupling agent such as DCC supported.
  • an anhydrous aprotic polar solvent such as THF
  • a base such as NaH
  • an alkenyl halide such as allyl bromide or 4-bromo-1-butene.
  • hydrochloric acid eg, dioxane solution
  • trifluoroacetic acid e.g, trifluoroacetic acid
  • TA in an aprotic polar solvent such as DCM by treatment with NHS in the presence of a coupling agent such as DCC supported.
  • anhydrous aprotic polar solvent such as THF
  • THF anhydrous aprotic polar solvent
  • THF tetrahydropyran ether
  • PEG alcohols with a protected acid function in the form of a tert-butyl ester are commercially available (such as tert-butyl 12-hydroxy-4,7,10-trioxadodecanoate) or prepared from F-butyl acrylate and a PEG diol.
  • TA in an aprotic polar solvent such as DCM by treatment with NHS in the presence of a coupling agent such as DCC supported.
  • an aprotic polar solvent such as DCM
  • an aprotic polar solvent such as acetonitrile
  • a polar solvent such as a THF / water mixture in the presence of triphenylphosphine.
  • a reducing agent such as sodium triacetoxyborohydride and, if necessary, acetic acid as catalyst.
  • a hydrochloric acid solution e.g. dioxane
  • trifluoroacetic acid we can draw inspiration from the conditions of Example 6, compound 29.
  • an aprotic polar solvent such as THF or DMF
  • base such as sodium hydride
  • a benzyl halide such as benzyl chloride
  • anhydrous aprotic polar solvent such as THF
  • a base such as sodium hydride
  • a nucleofugal group such as an alkyl halide
  • ZaSS-ALK-CHO aldehyde for example 2-methyl-2- (methyldithio) -propanal is commercially available or can be prepared by oxidation of an alcohol carrying a disulfide unit obtained from a suitably protected halogenated alcohol (for example in the form of silylated ether) by successive treatments with potassium thioacetate and a derivative thereof. of methanethiosulfonate type. prepared himself
  • an aprotic polar solvent such as DCM
  • an aprotic polar solvent such as acetonitrile
  • a polar solvent such as a THF / water mixture in the presence of triphenylphosphine.
  • an aprotic polar solvent such as dimethylformamide
  • coupling agents such as the N, N'-diisopropylcarbodiimide / 1-hydroxybenzotriazole system and a base such as TEA.
  • a hydrochloric acid solution eg, dioxane solution
  • trifluoroacetic acid we can draw inspiration from the conditions of Example 7, compound 32.
  • an aprotic polar solvent such as THF or DMF
  • base such as sodium hydride
  • a benzyl halide such as benzyl chloride
  • anhydrous aprotic polar solvent such as DCM
  • a reducing agent such as sodium triacetoxyborohydride and, if necessary, acetic acid as catalyst.
  • anhydrous aprotic polar solvent such as THF
  • a base such as sodium hydride
  • a nucleofugal group such as an alkyl halide
  • ZaS-ALK-CO 2 H for example 4-methyl-4- (methyldithio) -pentanoic acid, may be commercially available or prepared from a halogenated carboxylic acid by successive treatments with potassium thioacetate and a derivative of methanethiosulfonate type.
  • anhydrous aprotic polar solvent such as DCM
  • mesyl chloride in the presence of a base such as TEA.
  • a protic polar solvent such as an ethanol / water mixture
  • a mixture of polar solvents such as an ethanol / water mixture
  • a reagent comprising a methanethiosulphonate function such as methyl-methanethiosulphonate in the presence of a base such as sodium carbonate.
  • a hydrochloric acid solution eg, dioxane solution
  • trifluoroacetic acid e.g, trifluoroacetic acid
  • anhydrous aprotic polar solvent such as THF
  • a base such as sodium hydride
  • a polar solvent such as a dimethoxyethane / THF / water mixture
  • a base such as sodium bicarbonate.
  • a polar solvent such as a DCM / methanol mixture
  • a coupling agent such as EEDQ.
  • an aprotic polar solvent such as a DCM / acetonitrile mixture.
  • a polar solvent such as a DME / THF / water mixture
  • a base such as sodium bicarbonate.
  • a polar solvent such as a DCM / methanol mixture
  • a coupling agent such as EEDQ.
  • TA in an aprotic polar solvent such as DCM by treatment with NHS in the presence of a coupling agent such as DCC supported.
  • an aprotic polar solvent such as a DCM / acetonitrile mixture.
  • the PEG monoprotected diacids in allyl form are prepared according to the preparation description of the linker L 14 .
  • 2,5-Dioxo-pyrrolidin-1-yl bromoacetate and iodoacetate are commercial products with CAS numbers 42014-51-7 and 39028-27-8, respectively. Board
  • the conjugate is obtained by the process of:
  • step (ii) then optionally separating the conjugate formed in step (i) from the cryptophycin derivative and / or the unreacted targeting agent and / or aggregates that would have formed.
  • step (i) of the conjugate of step (i) is separated from unreacted cryptophycin derivative and aggregates that would have formed and the targeting agent is left in the solution. who would not have reacted.
  • the function of the contacting is to allow the chemical groups GCR1 and GCR2 to react in order to ensure the attachment of the cryptophycin derivative to the targeting agent by formation of a covalent bond; preferably,
  • GCR1 represents -SZ has: modifying the targeting agent with a modifying agent so as to introduce on the targeting agent of GCR2 groups suitable, including those described in the 2nd column of Table I:
  • the targeting agent comprises thiol chemical groups.
  • Aggregates means the associations that can be formed between two or more targeting agents, the targeting agents having been modified or not by conjugation. Aggregates are likely to form under the influence of a large number of parameters such as high concentration of targeting agent in the solution, pH of the solution, high shear forces, number of graft dimers and their hydrophobicity, temperature (see references cited in the introduction of J. Membrane Sci. 2008 , 318, 31 1-316), the influence of some of them sometimes not being clarified with precision. In the case of proteins or antibodies, reference may be made to AAPS Journal, “Protein Aggregation and Bioprocessing" 2006, 8 (3), E572-E579.
  • Aggregate content can be determined using known techniques such as SEC (see in this regard, Analytical Biochemistry 1993, 212 (2), 469-480).
  • the aqueous solution of the targeting agent may be buffered using, for example, buffers such as, for example, potassium phosphate or N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (HEPES buffer) or a buffer mixture such as buffer A described later.
  • the buffer depends on the nature of the targeting agent.
  • the cryptophycin derivative is dissolved in a polar organic solvent, for example DMSO or DMA.
  • the reaction takes place at a temperature generally between 20 and 40 ° C.
  • the duration of the reaction can vary between 1 to 24 hours.
  • the reaction between the antibody and the cryptophycin derivative may be followed by SEC with a refractometric and / or ultraviolet detector to determine its progress. If the substitution rate is insufficient, it is possible to allow a longer reaction time and / or to add cryptophycin derivative.
  • SEC refractometric and / or ultraviolet detector
  • the conjugate can be purified for example by steric exclusion chromatography (SEC), by adsorption chromatography (such as the exchange agent). ions, IEC), by hydrophobic interaction chromatography (HIC), by affinity chromatography, by chromatography on mixed media such as ceramic hydroxyapatite or by HPLC. Purification by dialysis or diafiltration can also be used.
  • SEC steric exclusion chromatography
  • IEC hydrophobic interaction chromatography
  • HPLC hydrophobic interaction chromatography
  • purification by dialysis or diafiltration can also be used.
  • step (i) or (ii) the solution of the conjugate may undergo a step (iii) of ultrafiltration and / or diafiltration. At the end of these steps, the conjugate in aqueous solution is thus obtained.
  • the antibody may be selected from those described in particular in WO 04043344, WO 08010101, WO 08047242, WO 05009369 (anti- CA6) or WO 2010014812.
  • the antibody may be optionally modified with a modifying agent to promote attachment of the derived from cryptophycin (see above).
  • the antibody may be in particular monoclonal, polyclonal or multispecific. It can also be an antibody fragment. It can also be a murine, human, humanized or chimeric antibody. joint
  • a conjugate generally comprises of the order of 1 to 10 cryptophycin derivatives covalently attached to the targeting agent (this is the level of grafting or "drug-to-antibody ratio" or “DAR" " in English). This number varies according to the nature of the targeting agent and the cryptophycin derivative as well as the operating conditions used in the conjugation method (for example number of equivalents of cryptophycin derivative relative to the targeting agent, reaction time, nature of the solvent and the optional cosolvent).
  • Contacting the targeting agent with the cryptophycin derivative results in a mixture comprising a plurality of conjugates individually distinguishable from each other by different DARs; optionally the unreacted targeting agent; possibly aggregates.
  • the DAR that is determined on the final solution therefore corresponds to an average DAR.
  • UV spectroscopy may be a method used to determine the DAR. This method is inspired by that presented in Antony S.
  • a ⁇ 1 (CD x ⁇ D ⁇ 1 ) + (c A x ⁇ A ⁇ i)
  • a ⁇ 2 (c D X ⁇ D ⁇ 2 ) + (c A X ⁇ A ⁇ 2 )
  • CD and CA respectively denote the concentrations in the solution of the part of the conjugate relating to the cryptophycin derivative and the part of the conjugate relating to the antibody;
  • naked antibody is intended to mean the antibody to which no cryptophycin derivative is attached, that is to say the antibody before the conjugation step.
  • CD [( ⁇ A ⁇ ix A ⁇ 2 ) - ( ⁇ A ⁇ 2 x A ⁇ 1 )] / [( ⁇ D ⁇ 2 x ⁇ A ⁇ 1 ) - ( ⁇ A ⁇ 2 x ⁇ D ⁇ 1 )]
  • the average DAR then corresponds to c D / c A.
  • ⁇ 1 280 nm and according to the nature of the cryptophycin derivative, ⁇ 2 is chosen in the specific wavelength range 246 nm - 252 nm.
  • the DAR (UV) is preferably greater than 0.5, more particularly between 1 and 10, even more particularly between 2 and 7.
  • the conjugate can be used as an anti-cancer agent. Because of the presence of the targeting agent, the conjugate is made very selective for tumor cells rather than healthy cells.
  • the conjugate can be used alone or in combination with at least one other anticancer drug.
  • the conjugate is formulated in the form of an aqueous buffered solution at a concentration generally of between 1 and 10 mg / ml.
  • This solution can be injected as an infusion such that it can be rediluted to form an infusion solution.
  • the analysis is carried out on a Waters UPLC-SQD apparatus and an Acquity BEH Ci 8 1, 7 ⁇ m (2.1 ⁇ 50 mm) column at 50 ° C. with a flow rate of 1 ml / min, an elution gradient (2 min) of (A) water / 0.1% formic acid and (B) acetonitrile / 0.1% formic acid (gradient: from 5% to 50% B in 0.8 min; 1 min: 100% B, 1.85 min: 100% B, 1.95 min: 5% B) and electrospray ionization in positive and / or negative mode.
  • the analysis is carried out on a Waters UPLC-SQD apparatus and an Acquity BEH Ci ⁇ 1, 7 ⁇ m (2.1 ⁇ 50 mm) column at 70 ° C. with a flow rate of 1 ml / min, an elution gradient (2 min ) of (A) water / 0.1% formic acid and (B) acetonitrile / 0.1% formic acid (gradient: 5% to 50% B in 1 min; 1, 3 min: 100% B; 1) , 45 min: 100% B, 1.75 min: 5% B) and electrospray ionization in positive and / or negative mode.
  • the analysis is carried out on a Waters ZQ apparatus and a Phenomenex Kinetex Ci ⁇ 100A 2.6 ⁇ m column (3 ⁇ 50mm) at 45 ° C. with a flow rate of 1 ml / min, an elution gradient (6 min) of A) water / 0.1% formic acid and (B) acetonitrile / 0.1% formic acid (gradient: 6% B: 0.8 min, 6% to 100% B in 4.1 min; 8 min: 100% B, 5.0-6.0 min: 6% B) and electrospray ionization in positive and / or negative mode.
  • the analysis is carried out on a Waters ZQ apparatus and a Phenomenex Kinetex Ci ⁇ 2.6 ⁇ m column (3 ⁇ 1000mm) at 50 ° C. with a flow rate of 0.8 ml / min, an elution gradient (8 min) of (A) water / 0.1% formic acid and (B) acetonitrile / 0.1% formic acid (gradient: 4% B: 0.15 min; 4% to 100% B in 6.85 min; , 1 min: 100% B, 7.4-8.2 min: 4% B) and electrospray ionization in positive and / or negative mode.
  • MS Mass spectrometry
  • the spectra were carried out by direct introduction on a WATERS GCTof apparatus (direct introduction without LC).
  • the assay may require a prior step of deglycosylation of the conjugate. This is carried out by adding to the conjugate solution 2% by volume of a PNGase F enzyme solution (prepared by supplementing to 100 ml a vial of 100 units of N-glycanase enzyme lyophilisate with water. milliQ). The solution is homogenized using the vortex and incubated at 37 ° C. 19 h. The degly ⁇ sylated sample is ready to be analyzed by SEC-HRMS.
  • a PNGase F enzyme solution prepared by supplementing to 100 ml a vial of 100 units of N-glycanase enzyme lyophilisate with water. milliQ.
  • the solution is homogenized using the vortex and incubated at 37 ° C. 19 h.
  • the degly ⁇ sylated sample is ready to be analyzed by SEC-HRMS.
  • the 1 H NMR spectra were carried out on a Bruker Avance spectrometer, either DRX-300, DRX-400, DRX-500 or DMX-600. The chemical shifts are given in ppm.
  • the antibody is first modified with an NHS-activated ester, in order to introduce on its surface pyridyldisulphide groups.
  • NHS activated ester dissolved in DMA such that the final concentration of antibody is between 5 and 10 mg / ml and the percentage of DMA in the aqueous buffer of 5%.
  • the reaction is continued for 2 h at RT.
  • a sample of the modified antibody is treated with dithiothreitol in order to reduce the disulfide bond, the pyridine-2-thione released is assayed by spectrometry (extinction coefficients: ⁇ 343 nm : 8080 M -1 cm -1 , ⁇ 28 o nm: 5100 M -1 cr ⁇ 1 pyridine-2-thione, and ⁇ o 28 nm: 208,380 M -1 cm -1 for the antibody). On average, from 3 to 6 pyridyldisulphide groups are grafted per molecule of antibody.
  • the reaction is continued overnight at 30 ° C or with stirring of about 2000 rpm.
  • the mixture is analyzed by SEC HPLC to determine the degree of grafting of the cryptophycin derivative to the antibody. If the degree of substitution is insufficient, the mixture is treated with 1 to 5 eq.
  • the fractions containing the conjugated antibody in monomeric form are collected, pooled and concentrated on Amicon Ultra-15 (Ultracel 10k or 50k membrane, Millipore) to a concentration of between 2 and 5 mg / ml.
  • Amicon Ultra-15 Ultracel 10k or 50k membrane, Millipore
  • a buffer change is finally made to remove the organic solvent from the conjugate conservation buffer.
  • the conjugate is deposited on a gel filtration column composed of a Sephadex TM G25 matrix (Nap-5, -10, PD-10, Hiprep 26/10 desalting, GE Healthcare columns) previously equilibrated with an aqueous buffer of composition and pHs adapted to each conjugate.
  • the final conjugate is determined by UV spectrometry using the extinction coefficients determined for the antibody and the corresponding cryptophycin derivative in order to measure the antibody concentration and the average number of cytotoxic antibodies.
  • the substitution rate can also be calculated from the deconvolution of the SEC-HRMS spectrum of the conjugate.
  • the antibody is first modified with an NHS-activated ester, in order to introduce on its surface pyridyldisulphide groups.
  • This antibody solution is treated with 5 to 10 eq.
  • NHS activated ester dissolved in DMA such that the final concentration of antibody is between 5 and 10 mg / ml and the percentage of DMA in the aqueous buffer of 5%.
  • the reaction is continued for 2 h at RT.
  • the reaction is continued overnight at 30 ° C or with stirring of about 2000 rpm.
  • the mixture is analyzed by SEC HPLC to determine the degree of grafting of the cryptophycin derivative to the antibody.
  • the mixture is treated with 1 to 5 eq. additional cryptophycin derivative (s) in the DMA for 3 h at 30 ° C or with agitation of about 2000 rpm.
  • the fractions containing the conjugated antibody in monomeric form are collected, pooled and concentrated on Amicon Ultra-15 (Ultracel 10k or 50k membrane, Millipore) to a concentration of between 2 and 5 mg / ml.
  • Amicon Ultra-15 Ultracel 10k or 50k membrane, Millipore
  • a buffer change is finally made to remove the organic solvent from the conjugate conservation buffer.
  • the conjugate is deposited on a gel filtration column composed of a Sephadex TM G25 matrix (Nap-5, -10, PD-10, Hiprep 26/10 desalting, GE Healthcare columns) previously equilibrated with an aqueous buffer of composition and pHs adapted to each conjugate.
  • the final conjugate is determined by UV spectrometry using the extinction coefficients determined for the antibody and the corresponding cryptophycin derivative in order to measure the antibody concentration and the average number of cytotoxic antibodies.
  • the substitution rate can also be calculated from the deconvolution of the SEC-HRMS spectrum of the conjugate.
  • the reaction is continued for 3 h at 30 ° C or with stirring of about 2000 rpm.
  • the mixture is analyzed by SEC HPLC to determine the level of cytotoxic grafting on the monomeric antibody population.
  • the mixture is treated with 1 to 5 eq. additional cryptophycin derivative (s) in the DMA for 3 h at 30 ° C or with agitation of about 2000 rpm.
  • conjugates containing conjugated antibody in form monomeric are collected, pooled and concentrated on Amicon Ultra-15 (Ultracel 10k or 50k membrane, Millipore) to a concentration of between 2 and 5 mg / ml.
  • Amicon Ultra-15 Ultracel 10k or 50k membrane, Millipore
  • a buffer change is finally made to remove the organic solvent from the conjugate conservation buffer.
  • the conjugate is deposited on a gel filtration column composed of a SephadexTM G25 matrix (Nap-5, -10, PD-10 or Hiprep 26/10 desalting columns, GEHealthcare column) previously equilibrated with an aqueous buffer of composition and pH adapted to each conjugate.
  • the final conjugate is assayed by UV spectrometry using the extinction coefficients determined for the antibody and the corresponding cryptophycin derivative in order to measure the antibody concentration and the degree of grafting.
  • the substitution rate can also be calculated from the deconvolution of the SEC-HRMS spectrum of the conjugate.
  • Example 1 (E) - (3S, 10R, 16S) -10- (3-Chloro-4-methoxy-benzyl) -3-isobutyl-16 - [(S) -1 - ((2R, 3R) -3 - ⁇ 4- [4- (4-Mercapto-4-methyl-pentanoyl) -piperazin-1-ylmethyl] -phenyl ⁇ -oxiranyl) -ethyl] -6,6-dimethyl-1,4-dioxa-8,11 -diaza-cyclohexadec-13-ene-2,5,9,12-tetraone
  • Compound 1 (30 mg, 42.9 ⁇ mol, prepared according to Al-awar RS, et al., J. Med., Chem., 2003, 46, 2985-3007) is placed in solution in anhydrous DMF (2 ml) and the mixture is cooled to 0 ° C. before adding TEA (107 ⁇ mol) and then CMS (64.6 ⁇ mol). After 15 min, the bath is removed and stirring is continued for 12 h at RT. The mixture is diluted by adding AcOEt (2 ml) and the organic phase is washed with water (2x1 ml), with aq solution. saturated NaHCO 3 (1 ml) and aq. saturated with NaCl (1 ml).
  • Fert -butyl compound 5 4- (4-Methyl-4-methyl-disulfanyl-pentanoyl) -piperazine-1-carboxylate
  • Example 1 (E) - (3S, 10R, 16S) -10- (3-Chloro-4-methoxy-benzyl) -3-isobutyl-6,6-dimethyl-16 - [(S) -1- ( 2R, 3R) -3- ⁇ 4- [4- (4-mercapto-4-methyl-pentanoyl) -piperazin-1-ylmethyl] -phenyl ⁇ -oxiranyl) -ethyl] - 1,4-dioxa-8,11-diaza-cyclohexadec-13-ene-2,5,9,12-tetraone
  • Example 2 (E) - (3S, 6R, 1 OR, 16S) -10- (3-Chloro-4-methoxy-benzyl) -3-isobutyl-16 - [(S) -1 - ((2R, 3R) 3- ⁇ 4- [4- (4-mercapto-4-methyl-pentanoyl) -piperazin-1-ylmethyl] -phenyl ⁇ -oxiranyl) -ethyl] -6-methyl-1,4-dioxa-8, 11-diaza-cyclohexadec-13-ene-2,5,9,12-tetraone
  • the product (34 mg, 36.6 ⁇ mol) is placed in solution in ethanol (4.3 ml) / water (3.6 ml) and the mixture is cloudy.
  • the TCEP (146 ⁇ mol) is then added, the mixture becomes colorless and is stirred for 2 hours at RT.
  • the mixture is diluted by adding AcOEt (20 ml) and the organic phase is washed with a 1/1 mixture of water and an aq solution. saturated with NH 4 Cl (20 ml).
  • the phase aq. is extracted with 2x20 ml of AcOEt, the organic phases are combined and washed with a saturated solution of NaCl (20 ml).
  • a solution of the compound 14 (1.11 g, 6.185 mmol) in 30 ml of THF is purged with argon and cooled to 0 ° C. before adding, at 0 ° C., 1.44 g (6.80 mmol). ) of sodium triacetoxyborohydride. Stirring is continued for 15 h at RT: there remains imine starting; 1.44 g (6.80 mmol) of sodium triacetoxyborohydride and 354 ⁇ l (6.185 mmol) of acetic acid are added at 0 ° C. and the stirring is continued at RT for 3 h. The mixture is diluted in 50 ml of AcOEt and washed with water (50 ml). The pH of the aq phase.
  • the compound 16 can be obtained by nucleophilic substitution of the chloro group of the derivative 2 with the amine 15 by applying the method described for the preparation of the compound 30.
  • Example 4 can be obtained by applying the method described for the preparation of Example 6 to compound 16.
  • Fert-butyl 17 4- (2-methyl-2-methyl-disulfanyl-propyl) -piperazine-1-carboxylate compound
  • Example 7 (E) - (3S, 10R, 16S) -10- (3-Chloro-4-methoxy-benzyl) -3-isobutyl-16 - [(S) -1 - ((2R, 3R) -3 - ⁇ 4- [4 - ( ⁇ 2- [2- (2- ⁇ 4-methyl-4-methyl-disulfanyl-pentanoylamino-ethoxy ⁇ -ethoxy) -ethoxy] -ethyl ⁇ methylamino) -methyl] -phenyl ⁇ -oxiranyl) ethyl] -6,6-dimethyl-1,4-dioxa-8,11-diaza-cyclohexadec-13-ene-2,5,9,12-tetraone
  • Example 7 (E) - (3S, 10R, 16S) -10- (3-Chloro-4-methoxy-benzyl) -3-isobutyl-16 - [(S) -1 - ((2R, 3R) -3 - ⁇ 4- [4 - ( ⁇ 2- [2- (2- ⁇ 4-methyl-4-methyl-disulfanyl-pentanoylamino-ethoxy ⁇ -ethoxy) -ethoxy] -ethyl ⁇ methylamino) -methyl] -phenyl ⁇ -oxiranyl) ethyl] -6,6-dimethyl-1,4-dioxa-8,11-diaza-cyclohexadec-13-ene-2,5,9,12-tetraone
  • Example 7 can be obtained by nucleophilic substitution of the chloro group of the derivative 2 with amine 32 by applying the method described for the preparation of compound 30 and then by reduction of the disulfide by applying the method described for the preparation of Example 6 .
  • Example 8 (E) - (3S, 10R, 16S) -10- (3-Chloro-4-methoxy-benzyl) -3-isobutyl-16 - ⁇ (S) -1 - [(2R, 3R) - 3 (4-Mercaptomethyl-phenyl) -oxiranyl] -ethyl ⁇ -6,6-dimethyl-1,4-dioxa-8,11-diaza-cyclohexadec-13-ene-2,5,9,12-tetraone
  • Example 8 (E) - (3S, 10R, 16S) -10- (3-Chloro-4-methoxy-benzyl) -3-isobutyl-16 - ⁇ (S) -1 - [(2R, 3R) -3 (4-Mercaptomethyl-phenyl) -oxiranyl] -ethyl ⁇ -6,6-dimethyl-1,4-dioxa-8,11-diaza-cyclohexadec-13-ene-2,5,9,12-tetraone
  • modified hu2H11 antibodies are obtained at a concentration of 4.28 mg / ml (9.42 mg, 91%) with an average of 4.68 molecules of pyridyldisulfides per antibody.
  • 1.68 ml (7.2 mg, 0.049 ⁇ mol) of modified hu2H11 antibody are treated with 1.03 mg of (E) - (3S, 10R, 16S) -10- (3-chloro-4-methoxy-benzyl) -3-isobutyl-16 - [(S) -1 - ((2R, 3R) -3- ⁇ 4 [4- (4-mercapto-4-methyl-pentanoyl) -piperazin-1-ylmethyl] -phenyl ⁇ -oxiranyl) -ethyl] -6,6-dimethyl-1,4-dioxa-8,11-diaza cyclohexadec-13-ene-2,5,9,12-te
  • 13.5 mg (0.092 ⁇ mol, 1.318 ml) of naked antibody hu2H11 at an initial concentration of 10.24 mg / ml are treated with 6 eq. N-hydroxy-succinimidyl ester of 4- (2-pyridyldithio) butanoic acid (0.18 mg, 0.551 ⁇ mol) in solution in 38.4 ⁇ l of DMA so that the final antibody concentration is 9 mg / ml in the mixture.
  • 1.333 ml (12.0 mg, 0.081 ⁇ mol) of the modified antibody mixture hu2H1 1 are successively added to 1. 760 ml of buffer pH ⁇ 7.5.
  • Example 13 (4- ⁇ 4 - [(2R, 3R) -3 - ((S) -1 - ⁇ (E) - (3S, 10R, 16S) -10- [3-Chloro-4-methoxy-benzyl] Isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11-diaza-cyclohexadec-13-en-16-yl ⁇ ethyl) oxiranyl] 2,5-dioxo-pyrrolidin-1-yl -benzyl ⁇ -piperazin-1-yl) -acetate
  • Tert-Butyl 34 4-Methoxycarbonylmethyl-piperazine-1-carboxylate compound
  • the derivative 1 (20 mg, 28.6 ⁇ mol) is placed in solution in anhydrous DCM (1 ml) and the TEA (71.5 ⁇ mol) and then the CMS (45.8 ⁇ mol) are added. After 12 h at RT, the product 2 formed is not isolated. The TEA (85.7 ⁇ mol) then the piperazin-1-yl-methyl acetate hydrochloride (42.8 ⁇ mol) are added. The mixture is stirred an additional 72 hours at RT before anhydrous DMF (1 ml) and NaI (30 ⁇ mol) are added. The mixture was stirred 48 h at 45 ° C before being diluted with TAcOEt (5 mL). The organic phase is washed with water (2 ⁇ 2 ml), with aq solution.
  • the expected product 38 is obtained in the form of a yellow oil (314 mg, 100%).
  • Example 13 (4- ⁇ 4 - [(2R, 3R) -3 - ((S) -1 - ⁇ (E) - (3S, 10R, 16S) -10- [3-Chloro-4-methoxy-benzyl] Isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11-diaza-cyclohexadec-13-en-16-yl ⁇ -ethyl) oxiranyl] 2,5-dioxo-pyrrolidin-1-yl -benzyl ⁇ -piperazin-1-yl) -acetate
  • Example 13 can be obtained by activating the acid 41 according to the method described for Example 18.
  • Example 14 (2- ⁇ 2- [2- (2- ⁇ 4 - [(2R, 3R) -3 - ((S) -1 - ⁇ (E) - (3S, 10R, 16S) -10- [ 3-Chloro-4-methoxy-benzyl] -3-isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11-diaza-cyclohexadec-13-en-16 2,5-dioxo-pyrrolidin-1-yl-1-yl ⁇ ethyl) oxiranyl] benzylamino ⁇ ethoxy) ethoxy] ethoxy ⁇ ethoxy) propanoate
  • Compound 42 allyl 3- (2- ⁇ 2- [2- (2-tert-butoxycarbonylamino-ethoxy) -ethoxy] -ethoxy ⁇ -ethoxy) -propanoate
  • Example 14 (2- ⁇ 2- [2- (2- ⁇ 4 - [(2R, 3R) -3 - ((S) -1 - ⁇ (E) - (3S, 10R, 16S) -10- [ 3-Chloro-4-methoxy-benzyl] -3-isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11-diaza-cyclohexadec-13-en-16 2,5-dioxo-pyrrolidin-1-yl (1-yl) ethoxy) ethoxy) oxyanyl] benzylamino ⁇ ethoxy) ethoxy] ethoxy ⁇ ethoxy) propanoate
  • Example 14 can be obtained by deprotecting compound 44 according to the method described for compound 41 and by activating the acid obtained according to the method described for example 18.
  • Example 15 (2- ⁇ 2- [2- (2- ⁇ 4 - [(2R, 3R) -3 - ((S) -1 - ⁇ (E) - (3S, 10R, 16S) -10- [ 3-Chloro-4-methoxy-benzyl] -3-isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa- ⁇ , 11-diaza-cyclohexadec-13-en-16 2,5-dioxo-pyrrolidin-1-yl-1-yl ⁇ ethyl) oxiranyl] benzylmethylamino ⁇ ethoxy) ethoxy] ethoxy ⁇ ethoxy) propanoate
  • Example 15 Acid (2- ⁇ 2- [2- (2- ⁇ 4 - [(2R, 3R) -3 - ((S) -1- ⁇ - (3S, 10R, 16S) -10- [3 4-chloro-4-methoxy-benzyl] -3-isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11-diaza-cyclohexadec-13-en-16- 2,5-dioxopyrrolidin-1-yl yl ⁇ -ethyl) oxiranyl] benzylamino ⁇ ethoxy) ethoxy] ethoxy ⁇ ethoxy) propanoate
  • Example 15 can be prepared by activating the acid 49 according to the method described for Example 18.
  • Example 16 (2- ⁇ 2- [2- (4 - ⁇ (2R, 3R) -3 - [(S ) -1 - ((E) - (3S, 10R, 16S) -10- ⁇ 3-chloro-4-methoxy-benzyl ⁇ -3-isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo 1, 4-Dioxa-8,11-diaza-cyclohexadec-13-en-16-yl) -ethyl] -oxiranyl ⁇ -benzyl-piperazin-1-yl) ethoxy] -ethoxy ⁇ -ethoxy) -propanoate 2,5-dioxopyrrolidin-1-yl
  • Compound 50 3- ⁇ 2- [2- (2-hydroxyethoxy) -ethoxy] -ethoxy ⁇ -propanoic acid
  • the compound 54 can be obtained by nucleophilic substitution of the chloro group of the derivative 2 with the amine 53 by applying the method described for the preparation of the compound 30.
  • Compound 55 can be obtained according to the method described for compound 41.
  • Example 16 (2- ⁇ 2- [2- (4 - ⁇ (2R, 3R) -3 - [(S) -1 - ((E) - (3S, 10R, 16S) -10- ⁇ 3-Chloro 4-methoxy-benzyl-3-isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11-diaza-cyclohexadec-13-en-16-yl) 2,5-dioxo-pyrrolidin-1-yl-ethyl] oxiranyl ⁇ -benzyl-piperazin-1-yl) -ethoxy] -ethoxy ⁇ -ethoxy) -propanoate
  • Example 16 can be obtained according to the method described for Example 18.
  • Example 17 3- (2- ⁇ 2- [2- (2- ⁇ 2- [4- (4- ⁇ 4 - [(2R, 3R) -3 - ((S) -1 - ⁇ (E) - (10R, 16S) -10- (3-Chloro-4-methoxy-benzyl) -3-isobutyl-6,6-dimethyl-2,5 , 9,12-tetraoxo-1,4-dioxa-8,11-diaza-cyclohexa- dec-13-en-16-yl) ethyl) oxiranyl] benzyl ⁇ -piperazin-1-yl) -1,1-dimethyl-4-oxo-butylsulfanyl] -acetylamino ⁇ -ethoxy) -ethoxy] -ethoxy 2,5-dioxo-pyrrolidin-1-yl ⁇ ethoxy) propan
  • Example 17 3- (2- ⁇ 2- [2- (2- ⁇ 2- [4- (4- ⁇ 4 - [(2R, 3R) -3 - ((S) -1 - ⁇ (E) - (10R, 16S) -10- (3-Chloro-4-methoxybenzyl) -S-isobutyl- ⁇ .-dimethyl- .delta.-tetraoxo-1-dioxa- ⁇ .H-diaza-cyclohexadec -IS- ⁇ n- ⁇ -yl) -ethyl-oxiranyl] benzyl-piperazin-1-yl) -1,1-dimethyl-4-oxo-butylsulfanyl-acetylamino-ethoxy) ethoxy-ethoxy ⁇ ethoxy) -propionate of 2,5-dioxyrimidin-1-yl To a solution, purged with argon, of the compound Ex1 (15.6 mg, 17.
  • Example 18 3- (2- ⁇ 2- [2- (2- ⁇ 4 - [(2S, 3S) -3 - ((S) -1 - ⁇ (E) - (3S, 10R, 16S) -10 - [3-Chloro-4-methoxy-benzyl] -3-isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa- ⁇ , 11-diaza-cyclohexa-dec-13 2,5-dioxo-pyrrolidin-1-yl-1-enyl-16-yl ⁇ -ethyl) -oxiranyl] -benzyloxycarbonylamino ⁇ ethoxy) ethoxy] ethoxy ⁇ -ethoxy) -propanoate
  • Derivative 57 (20 mg, 28.6 ⁇ mol, prepared according to Al-awar RS, et al., J.Med.Chem., 2003, 46, 2985-3007) is placed in solution in anhydrous DCM (0.3 ml), the solution is purged with argon before TEA (40 ⁇ mol) and then 4-nitrophenyl chloroformate (32.32 ⁇ mol) are added. . After stirring for 30 minutes at RT, the mixture is hydrolyzed and diluted in 7 ml of AcOEt.
  • Example 18 3- (2- ⁇ 2- [2- (2- ⁇ 4 - [(2S, 3S) -3 - ((S) -1 - ⁇ (E) - (3S, 10R, 16S) -10 - [3-Chloro-4-methoxybenzyl-5-isobutyl- ⁇ . ⁇ -dimethyl] .delta.-tetraoxo-1-dioxa- ⁇ .H-diaza-cyclohexa-dec-IS-en 2,5-dioxo-pyrrolidin-1-yl (5-dioxo-pyrrolidin-1-yl) -5-yl ⁇ -ethyl) oxiranyl] benzyloxycarbonylamino ⁇ ethoxy) ethoxy] ethoxy ⁇ ethoxy) propanoate
  • Example 19 (1- ⁇ 4-r (2R, 3R) -3 - ((S) -1 - ⁇ (E) - (3S, 10R, 16S) -10-r3-Chloro-4-methoxy-benzyl) 3-Isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11-diaza-cyclohexadec-13-en-16-yl ⁇ -ethyl) oxiranyl] benzyl 2,5-dioxo-pyrrolidin-1-yl ⁇ -1H-1,2,3-triazol-4-yl) -butanoate
  • Example 19 (1- ⁇ 4 - [(2R, 3R) -3 - ((S) -1 - ⁇ (E) - (3S, 10R, 16S) -10- [3-Chloro-4-methoxy-benzyl] Isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11-diaza-cyclohexadec-13-en-16-yl ⁇ -ethyl) oxiranyl] 2,5-dioxo-pyrrolidin-1-yl -benzyl ⁇ -1H-1, 2,3-triazol-4-yl) -butanoate
  • Example 20 3- (2- ⁇ 2- [2- (2- ⁇ 1 - [1 - (4 - ⁇ (2R, 3R) -3 - [(S) -1 - ((E) - (10R, 16S) -10- (3-Chloro-4-methoxy-benzyl) -3-isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11-diaza-cyclohexadec Methyl-13-en-16-yl) -ethyl] oxiranyl ⁇ -benzyl) -1,2,3-triazol-1-yl] -methoxy-ethoxy) -ethoxy] -ethoxy ⁇ -ethoxy) -propanoate , 5-dioxa-pyrrolidin-1-yl
  • Example 20 3- (2- ⁇ 2- [2- (2- ⁇ 1- [1- (4 - ⁇ (2R, 3R) -3 - [(S) -1 - ((E) - (10R, 16S) -10- (3-Chloro-4-methoxy-benzyl) -S-isobutyl- ⁇ -dimethyl- ⁇ -diethyl-tetraoxo-1-dioxa- ⁇ -H-diaza-cyclohexadec-IS- 1- (2-yl) -ethyl] -oxiranyl ⁇ -benzyl) -1,2,3-triazol-1-yl] -methoxy ⁇ -ethoxy) -ethoxy] -ethoxy ⁇ -ethoxy) -propanoate 2.5 g. dioxa-pyrrolidin-1-yl
  • Example 20 can be obtained from compounds 60 and 65 according to the method described for compound 61 and then activating the acid according to the method described for example 19.
  • Example 21 (4- ⁇ 1 - [(4 - ⁇ (2R, 3R) -3 - [(S) -1 - ((E) - (3S, 10R, 16S) -10- ⁇ 3-chloro-4-methoxy-benzyl ⁇ -3-isobutyl-6, 6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11-diaza-cyclohexadec-13-en-16-yl) -ethyl] -oxiranyl ⁇ -benzyl) -methylamino] methyl 2,5-dioxopyrrolidin-1-yl ⁇ -1,2,3-triazol-1-yl) -butanoate
  • Example 21 (4- ⁇ 1 - [(4 - ⁇ (2R, 3R) -3 - [(S) -1 - ((E) - (3S, 10R, 16S) -10- ⁇ 3-chloro-4 Methoxy-benzyl-3-isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11-diaza-cyclohexadec-13-en-16-yl) -ethyl 2,5-dioxo-pyrrolidin-1-yl] oxiranyl ⁇ benzyl) methylamino] methyl] -1,2,3-triazol-1-yl) butanoate
  • Example 21 can be obtained by activation of the acid 69 according to the method described for Example 19.
  • Alolol 57 (36 mg, 51.48 ⁇ mol, prepared according to Al-awar RS, et al., J.Med.Chem.2003, 46, 2985-3007) is placed in solution in anhydrous THF (2 ml). The solution is purged with argon and cooled with an ice-water bath before adding the DPPA (74 ⁇ mol) then the DBU (80 ⁇ mol). The mixture is allowed to return to RT and stirring is continued overnight. The next day, the solution is cooled again with an ice-water bath, then 74 ⁇ mol of DPPA and 80 ⁇ mol of additional DBU are added. After 2 h of reaction at 0 ° C.
  • the compound 76 (6 mg, 4.93 ⁇ mol) is dissolved in a mixture of DCM (0.5 ml) and DMF (0.1 ml) and then the N, N'-disuccinimidyl carbonate is successively added. (6 mg, 23.42 ⁇ mol) and DIPEA (4 ⁇ l, 22.96 ⁇ mol). After 3 hours of reaction at RT, a solution aq. Saturated with NH 4 CI is added and the mixture is extracted 3 times with DCM. The combined organic phases are dried over Na 2 SO 4 , filtered and concentrated under RP. The crude is purified by chromatography on silica gel, eluting with a DCM / methanol mixture 100/0 to 90/10.
  • Example 23 can be obtained by activating the acid 80 according to the method described for Example 22.
  • EXAMPLE 24 4 - ((2S, 3S) -3 - ⁇ (S) -1 - [(E) - (3S) [2-Methyl-2- (pyridin-2-yldisulfanyl) -propyl] -methyl-carbamate 10R, 16S) -10- (3-chloro-4-methoxy-benzyl) -3-isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11- diaza-cyclohexadec-13-en-16-yl] -ethyl ⁇ -oxiranyl) -benzyl
  • Example 24 4 - ((2S, 3S) -3 - ⁇ (S) - 1 - [(E) - (3S) [2-Methyl-2- (pyridin-2-yldisulfanyl) -propyl] -methyl-carbamate 10R, 16S) -10- (3-chloro-4-methoxy-benzyl) -3-isobutyl-6,6-dimethyl-2,5,9,12-tetraoxo-1,4-dioxa-8,11- diaza-cyclohexadec-13-en-16-yl] -ethyl ⁇ -oxiranyl) -benzyl
  • HRMS cryptophycin derivatives
  • -Lys- means that the attachment is to the ⁇ -amino groups of the lysines of the anti ⁇ rps.
  • the MDA-MB-231, MDA-A1 or HCT116 cells in their exponential growth phase are trypsinized and delivered in suspension in their respective culture medium (DMEM / F12 Gibco # 21331, 10% Gibco SVF # 10500-056, 2 nM Gibco Glutamine # 25030 for MDA cells, DMEM Gibco # 11960, 10% Gibco SVF # 10500-056, 2mM Glutamine Gibco # 25030 for HCT116 cells).
  • the cell suspension is seeded into Cytostar 96-well culture plates (GE Healthcare Europe, # RPNQ0163) in the complete culture medium containing serum at a density of 5000 cells / well (MDA-MB-231, MDA-A1, HCT1 16). After 4 hours of incubation, successive dilutions of the cryptophycin derivatives are added to the wells at decreasing concentrations of 10 -7 to 10 -12 M (in triplicate for each concentration). The cells are cultured for 3 days at 37 ° C. in a 5% CO 2 atmosphere in the presence of cytotoxic agents.
  • Example 29 Evaluation of the inhibition of proliferation of MDA-MB-231, MDA-A1 and HCT116 cell lines by antibody-cytotoxic conjugates
  • the MDA-MB-231, MDA-A1 or HCT116 cells in their exponential growth phase are trypsinized and resuspended in their respective culture medium (DMEM / F12 Gibco # 21331, 10% Gibco SVF # 10500-056, 2 nM Gibco glutamine # 25030 for MDA cells, DMEM Gibco # 1 1960, 10% SVF Gibco # 10500-056, 2 mM Glutamine Gibco # 25030 for 16 HCT1 cells.
  • the cell suspension is seeded into Cytostar 96-well culture plates (GE Healthcare Europe, # RPNQ0163) in the complete culture medium containing serum at a density of 5000 cells / well (MDA-MB-231, MDA-A1, HCT1 16).
  • the data are expressed as a percentage of survival by making the ratio between the count obtained with the cells treated with the immunoconjugate and that obtained with the cells of the control wells (treated with the culture medium alone).
  • the naked antibody hu2H11 was added to the wells at a concentration of 1 ⁇ M at the start of the experiment and the inhibition of proliferation was measured as previously described.

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UY32745A (es) 2011-01-31
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SG177419A1 (en) 2012-02-28
CA2766762C (fr) 2017-06-20
FR2947271B1 (fr) 2013-04-05
FR2947269A1 (fr) 2010-12-31
AU2010267917A1 (en) 2012-02-02
WO2011001052A1 (fr) 2011-01-06
US20120225089A1 (en) 2012-09-06
US8952147B2 (en) 2015-02-10
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BRPI1015131A2 (pt) 2018-12-04
AU2010267917B2 (en) 2016-03-17
KR101770584B1 (ko) 2017-08-24
TN2011000636A1 (fr) 2013-05-24
FR2947269B1 (fr) 2013-01-18
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CA2766762A1 (fr) 2011-01-06
IL217208A0 (en) 2012-03-01
AR078131A1 (es) 2011-10-19
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FR2947271A1 (fr) 2010-12-31
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HN2011003414A (es) 2014-11-10
ZA201109537B (en) 2013-03-27

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