WO2005118565A1 - Intermediates for the preparation of halichondrin b - Google Patents

Intermediates for the preparation of halichondrin b Download PDF

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Publication number
WO2005118565A1
WO2005118565A1 PCT/US2005/019669 US2005019669W WO2005118565A1 WO 2005118565 A1 WO2005118565 A1 WO 2005118565A1 US 2005019669 W US2005019669 W US 2005019669W WO 2005118565 A1 WO2005118565 A1 WO 2005118565A1
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vol
added
reaction
stirred
mixture
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PCT/US2005/019669
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French (fr)
Inventor
Brian Austad
Charles E. Chase
Francis G. Fang
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Eisai Co., Ltd.
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34972515&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2005118565(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to EP19172746.0A priority Critical patent/EP3587408A1/en
Priority to JP2007515643A priority patent/JP5226304B2/en
Priority to CA2567984A priority patent/CA2567984C/en
Priority to AU2005250487A priority patent/AU2005250487B2/en
Priority to EP05760356A priority patent/EP1771431A1/en
Priority to US13/924,892 priority patent/USRE46965E1/en
Priority to EP15159875.2A priority patent/EP2949652B1/en
Priority to KR1020077000085A priority patent/KR101434673B1/en
Priority to US13/495,909 priority patent/USRE45324E1/en
Application filed by Eisai Co., Ltd. filed Critical Eisai Co., Ltd.
Priority to US11/628,396 priority patent/US7982060B2/en
Publication of WO2005118565A1 publication Critical patent/WO2005118565A1/en
Priority to IL180252A priority patent/IL180252A/en
Priority to US13/171,971 priority patent/US20120029213A1/en
Priority to US13/476,276 priority patent/US8445701B2/en
Priority to US13/868,641 priority patent/US8618313B2/en
Priority to IL227402A priority patent/IL227402A/en
Priority to IL227474A priority patent/IL227474A/en
Priority to US14/096,549 priority patent/US8884031B2/en
Priority to US14/250,086 priority patent/US8975422B2/en
Priority to US14/624,171 priority patent/US9303050B2/en
Priority to IL247620A priority patent/IL247620B/en
Priority to US15/944,480 priority patent/USRE47797E1/en
Priority to IL267606A priority patent/IL267606B/en

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Definitions

  • the present invention relates to compounds useful as intermediates in the synthesis of pharmaceutically active macrolide compounds.
  • Halichondrin B is a potent anticancer agent originally isolated from the marine sponge Halichondria okadai, and subsequently found in Axinella sp., Phakellia carteri, and Lissondendryx sp. A total synthesis of Halichondrin B was published in 1992 (Aicher, T. D. et al, J. Am. Chem. Soc. 114:3162-3164).
  • Halichondrin B has demonstrated in vitro inhibition of tubulin polymerization, microtubule assembly, beta s -tubulin crosslinking, GTP and vinblastine binding to tubulin, and tubulin-dependent GTP hydrolysis and has shown in vitro and in vivo anti-cancer properties. Accordingly, there is a need to develop synthetic methods for preparing analogs of Halichondrin B useful as anti-cancer agents.
  • the present invention provides methods for preparing analogs of Halichondrin B having pharmaceutical activity, such as anticancer or antimitotic (mitosis- blocking) activity.
  • These compounds include a compound of formula B-1939:
  • These compounds are useful for treating cancer and other proliferative disorders including, but not limited to, melanoma, fibrosarcoma, leukemia, colon carcinoma, ovaiian carcinoma, breast carcinoma, osteosarcoma, prostate carcinoma, lung carcinoma, and ras- transformed fibroblasts.
  • the present invention also provides synthetic intermediates useful for preparing said analogs of Halichondrin B.
  • Halichondrin B As described in, e.g. United States Patent 6,365,759 and United States Patent 6,469,182 the entirety of which are incorporated herein by reference.
  • Halichondrin B analogs are prepared generally by the assembly of three fragments F-1, F-2, and F-3, as shown by Scheme I below:
  • the present invention provides a compound F-1 :
  • each of PG and PG is independently hydrogen or a suitable hydroxyl protecting group
  • R 1 is R or OR
  • R 1 is OR. In other embodiments, R 1 is OR wherein R is hydrogen, methyl, or benzyl.
  • PG 1 and PG 2 are hydrogen. In other embodiments, one of
  • Suitable hydroxyl protecting groups are well known in the art and include those described in detail in Protecting Groups in Organic Synthesis, T. W. Greene and P. G. M. Wuts, 3 rd edition, John Wiley & Sons, 1999, the entirety of which is incorporated herein by
  • each of PG and PG taken with the oxygen atom to which it is bound, is independently selected from esters, ethers, silyl ethers, alkyl ethers, arylalkyl ethers, and alkoxyalkyl ethers.
  • esters include formates, acetates, carbonates, and sulfonates.
  • Specific examples include formate, benzoyl formate, chloroacetate, trifluoroacetate, methoxyacetate, triphenylmethoxyacetate, p- chlorophenoxyacetate, 3-phenylpropionate, 4-oxopentanoate, 4,4-(ethylenedithio)pentanoate, pivaloate (trimethylacetyl), crotonate, 4-methoxy-crotonate, benzoate, p-benylbenzoate, 2,4,6-trimethylbenzoate, or carbonates such as methyl, 9-fluorenylmethyl, ethyl, 2,2,2- trichloroethyl, 2-(trimethylsilyl)ethyl, 2-(phenylsulfonyl)ethyl, vinyl, allyl, and p-nitrobenzyl.
  • silyl ethers examples include trimethylsilyl, triethylsilyl, t-butyldimethylsilyl, t- butyldiphenylsilyl, triisopropylsilyl, and other trialkylsilyl ethers.
  • Alkyl ethers include methyl, benzyl, p-methoxybenzyl, 3,4-dimethoxybenzyl, trityl, t-butyl, allyl, and allyloxycarbonyl ethers or derivatives.
  • Alkoxyalkyl ethers include acetals such as methoxymethyl, methylthiomethyl, (2-methoxyethoxy)methyl, benzyloxymethyl, beta-
  • arylalkyl ethers include benzyl, p-methoxybenzyl (MPM), 3,4-dimethoxybenzyl, O-nitrobenzyl, p- nitrobenzyl, p-halobenzyl, 2,6-dichlorobenzyl, p-cyanobenzyl, 2- and 4-picolyl.
  • one or both of the PG 1 and PG 2 moieties of F-1 are silyl ethers or arylalkyl ethers. In yet other embodiments, one or both of the PG 1 and PG 2 moieties of F-1 are t-butyldimethylsilyl or benzoyl. In still other embodiments, both of the PG 1 and
  • PG 2 moieties of F-1 are t-butyldimethylsilyl.
  • PG and PG are taken together, with the oxygen atoms to which they are bound, to form a diol protecting group, such as a cyclic acetal or ketal.
  • a diol protecting group such as a cyclic acetal or ketal.
  • groups include methylene, ethylidene, benzylidene, isopropylidene, cyclohexylidene, and cyclopentylidene, a silylene derivative such as di-t-butylsilylene and a
  • 1,1,3,3-tetraisopropylidisiloxanylidene derivative 1,1,3,3-tetraisopropylidisiloxanylidene derivative, a cyclic carbonate, and a cyclic boronate.
  • PG and PG are taken together to form an acetonide group.
  • R is CHO
  • the present invention provides a compound of formula F-1 having the stereochemistry depicted in compound F-1':
  • the present invention provides a compound
  • X is halogen or -OSO 2 (R y );
  • R y is C ⁇ -6 aliphatic or a 5-7 membered saturated, partially unsaturated, or fully unsaturated ring, wherein R y is optionally substituted with up to 3 groups selected from halogen, R,
  • each R is independently hydrogen, C 1- haloaliphatic, or C 1-4 aliphatic; and PG is a suitable hydroxyl protecting group.
  • a suitable leaving group is a chemical moiety that is readily displaced by a desired incoming chemical moiety.
  • Suitable leaving groups are well l ⁇ iown in the art, e.g., see, "Advanced Organic Chemistry,” Jerry March, 4 th Ed., pp. 351-357, John Wiley and Sons, N.Y. (1992).
  • Such leaving groups include, but are not limited to, halogen, alkoxy, sulphonyloxy, optionally substituted alkylsulphonyloxy, optionally substituted alkenylsulfonyloxy, optionally substituted arylsulfonyloxy, and diazonium moieties.
  • LG 1 moiety of F-2 is sulphonyloxy, optionally substituted alkylsulphonyloxy, optionally substituted alkenylsulfonyloxy, or optionally substituted arylsulfonyloxy. In other embodiments, the LG 1 moiety of F-2 is optionally substituted alkylsulphonyloxy.
  • the LG 1 moiety of F-2 is mesyl or tosyl.
  • the X moiety of F-2 is halogen.
  • the X moiety of F-2 is sulphonyloxy, optionally substituted alkylsulphonyl, optionally substituted alkenylsulfonyl, or optionally substituted arylsulfonyl.
  • the X moiety of F-2 is triflate.
  • the PG 3 moiety of F-2, taken with the oxygen atom to which it is bound is a silyl ether. In other embodiments, the PG moiety of F-2, taken with the oxygen atom to which it is bound, is an ester group. According to one aspect of the present invention, the PG moiety of F-2-, taken with the oxygen atom to which it is bound, is t-butyldimethylsilyl. According to another aspect of the present invention, the PG 3 moiety of F-2, taken with the oxygen atom to which it is bound, is pivaloyl or benzoyl. [0022] In certain embodiments, the present invention provides a compound of formula F-2 having the stereochemistry depicted in formula F-2':
  • a compound F-2a or F-2b is provided:
  • the present invention provides a compound of formula F-2b wherein said compound is crystalline.
  • a compound of formula F-2b is provided wherein said compound is crystallized from an alkane solvent.
  • crystalline F-2b is provided wherein said compound is crystallized from pentane or heptane.
  • crystalline F-2b is provided wherein said compound is crystallized at about 0 °C.
  • Alk is a C 1-4 straight or branched aliphatic group
  • PG 5 is a suitable hydroxyl protecting group.
  • Suitable hydroxyl protecting group PG 5 is as described and defined for the PG 3 moiety of compound F-2, supra.
  • PG 5 taken with the oxygen atom to which it is bound, is a silyl ether.
  • PG 5 is t-butyldimethylsilyl.
  • the Alk moiety of compound F-2d is methyl.
  • a compound of formula F-2d' is provided:
  • R" is OH, OPG 3 , or LG 4 ;
  • LG 4 is a suitable leaving group; and each PG 3 is independently a suitable hydroxyl protecting group, provided that R" is other than OMs when PG 3 is t-butyldiphenylsilyl.
  • R" is other than OMs when PG 3 is t-butyldiphenylsilyl.
  • R" is OH or LG 4 .
  • the LG 4 leaving group of formula F-2e is as described and defined for the LG 1 moiety of compound F-2, supra.
  • LG 4 is tosyl or mesyl.
  • PG moiety of compound F-2e is as defined and described for the PG moiety of compound F-2, supra.
  • PG taken with the oxygen atom to which it is bound, is a silyl ether.
  • PG 3 is t-butyldiphenylsilyl.
  • F-2f wherein Alk, PG and PG are as defined generally and in classes and subclasses described above and herein.
  • Compounds of formula F-2f are used to prepare compounds of formula F-2 by methods described herein and those known in the art. [0034] Details of the synthesis of F-2a are set forth in the Examples infra. [0035] Alternatively, compounds of formula F-2 are prepared from D-quinic acid as shown by Scheme II below. Details of the preparation of compounds of formula F-2 are set forth in the Examples infi-a.
  • Scheme III above shows an alternate method for preparing intermediate 17 from intermediate 12 via Eschenmoser-Tanabe Fragmentation, wherein each R x is independently OPG x or CN wherein PG X is a suitable hydroxyl protecting group as described herein.
  • Intermediate 17 is then used to prepare compounds of formula F-2 according to Scheme II above.
  • each PG 5 and PG 6 is independently a suitable hydroxyl protecting group.
  • PG 5 and PG 6 are taken together to form a cyclic diol protecting group.
  • PG 5 and PG 6 are taken together to form a cyclohexylidene protecting group.
  • LG 5 is a suitable leaving group. Such suitable leaving groups are well known in the art and include those described herein.
  • LG 5 is mesyl or tosyl.
  • the present invention provides a compound of formula A:
  • n 1, 2, or 3; each of PG 5 and PG 6 is independently a suitable hydroxyl protecting group;
  • W is CH-A or C(O);
  • A is oxo or a C 1-6 aliphatic group, wherein A is optionally substituted with one or more Q 1 groups; each Q 1 is independently selected from cyano, halo, azido, oxo, OR, SR, SO 2 R, OSO R, N(R) 2 , NR(CO)R, NR(CO)(CO)R, NR(CO)N(R) 2 , NR(CO)OR, (CO)OR, O(CO)R, (CO)N(R) 2 , O(CO)N(R) 2 , or OPG 1 , wherein PG 1 is a suitable hydroxyl protecting group, and wherein: two Q 1 on A are optionally taken together to form a 3-8 membered saturated, partially unsaturated, or aryl ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur; and each R is independently selected from hydrogen or an optionally substituted group selected from C ⁇ - 6
  • the present invention provides a compound of formula A' wherein A is C(O) and said compound is of formula A'-l:
  • the A group of formulae A and A' is a C 1-6 aliphatic group, wherein A is optionally substituted with Q 1 .
  • the A group of formulae A and A' is a C 2- aliphatic group, wherein A is substituted with one or more Q 1 groups.
  • each Q group of formulae A and A' is independently selected from cyano, halo, azido, oxo, OR, SR, SO 2 R, OSO 2 R, N(R) 2 , NR(CO)R,
  • Q 1 group of formulae A and A' is independently selected from cyano, halo, azido, oxo,
  • A' is independently selected from cyano, halo, azido, oxo, OR, SR, SO 2 R, OSO 2 R, N(R) 2 ,
  • exemplary Q 1 groups include NH(CO)(CO)-(heterocyclic radical or heteroaryl), OSO 2 -(aryl or substituted aryl),
  • the A group of formulae A and A' has one of the following characteristics:
  • A has at least one substituent selected from hydroxyl, amino, azido, halo, and oxo;
  • A is a C 1-6 alkyl group having at least one substituent selected from hydroxyl, amino, and azido;
  • A has at least two substituents independently selected from hydroxyl, amino, and azido;
  • A has at least two substituents independently selected from hydroxyl and amino;
  • A has at least one hydroxyl substituent and at least one amino substituent
  • A has at least two hydroxyl substituents
  • A is a C 2- aliphatic group that is substituted
  • A is a C 3 aliphatic group that is substituted; (9) A has an (S)-hydroxyl alpha to the carbon atom linking A to the ring containing G or an (R)-hydroxyl; and
  • (10) A is a C 1-6 saturated aliphatic group having at least one substituent selected from hydroxyl and cyano.
  • (S)-hydroxyl means that the configuration of the carbon atom having the hydroxyl group is (S).
  • Embodiments of the invention also include compounds wherein A is substituted at least once on each carbon atom: (1) alpha and gamma, (2) beta and gamma, or (3) alpha and beta to the carbon atom to which A is attached.
  • Each of the alpha, beta, and gamma carbon atoms are independently in the (R) or (S) configuration.
  • the invention provides said compound wherein A is substituted at least once on each carbon atom alpha and beta to the carbon atom to which A is attached.
  • Exemplary A groups of formulae A and A' include 2,3-dihydroxypropyl, 2- hydroxyethyl, 3-hydroxy-4-perfluorobutyl, 2,4,5-trihydroxypentyl, 3-amino-2- hydroxypropyl, 1,2-dihydroxyethyl, 2,3-dihyroxy-4-perflurobutyl, 3-cyano-2-hydroxypropyl, 2-amino-l-hydroxy ethyl, 3 -azido-2 -hydroxypropyl, 3,3-difluoro-2,4-dihydroxybutyl, 2,4- dihydroxybutyl, 2-hydroxy-2-(p-fluorophenyl)-ethyl, -CH 2 (CO)(substituted or unsubstituted aryl), -CH 2 (CO)(alkyl or substituted alkyl, such as haloalkyl or hydroxyalkyl) and 3,3- difluoro-2-hydroxypent-4
  • the A group of either of formulae A and A' is 3-amino-2- hydroxypropyl.
  • the present invention provides a compound of either of formulae A and A', wherein Q 1 is OPG , wherein PG is a suitable hydroxyl protecting group.
  • Suitable hydroxyl protecting groups are well known in the art and include those described in detail in Protecting Groups in Organic Synthesis, T. W. Greene and P. G. M. Wuts, 3 edition, John Wiley & Sons, 1999, the entirety of which is incorporated herein by reference.
  • the PG 1 moiety of either of formulae A and A', taken with the oxygen atom to which it is bound is selected from esters, ethers, silyl ethers, alkyl ethers, arylalkyl ethers, and alkoxyalkyl ethers.
  • esters include formates, acetates, carbonates, and sulfonates.
  • Specific examples include formate, benzoyl formate, chloroacetate, trifluoroacetate, methoxyacetate, triphenylmethoxyacetate, p- chlorophenoxyacetate, 3-phenylpropionate, 4-oxopentanoate, 4,4-(ethylenedithio)pentanoate, pivaloate (trimethylacetyl), crotonate, 4-methoxy-crotonate, benzoate, p-benylbenzoate, 2,4,6-trimethylbenzoate, carbonates such as methyl, 9-fluorenylmethyl, ethyl, 2,2,2- trichloroethyl, 2-(trimethylsilyl)ethyl, 2-(phenylsulfonyl)ethyl, vinyl, allyl, and p-nitrobenzyl.
  • silyl ethers examples include trimethylsilyl, triethylsilyl, t-butyldimethylsilyl, t- butyldiphenylsilyl, triisopropylsilyl, and other trialkylsilyl ethers.
  • Alkyl ethers include methyl, benzyl, p-methoxybenzyl, 3,4-dimethoxybenzyl, trityl, t-butyl, allyl, and allyloxycarbonyl ethers or derivatives.
  • Alkoxyalkyl ethers include acetals such as methoxymethyl, methylthiomethyl, (2-methoxyethoxy)methyl, benzyloxymethyl, beta- (trimethylsilyl)ethoxymethyl, and tetrahydropyranyl ethers.
  • arylalkyl ethers include benzyl, p-methoxybenzyl (MPM), 3,4-dimethoxybenzyl, O-nitrobenzyl, p- nitrobenzyl, p-halobenzyl, 2,6-dichlorobenzyl, p-cyanobenzyl, 2- and 4-picolyl.
  • the PG 1 moiety of either of formulae A and A' taken with the oxygen atom to which it is bound, is a silyl ether or arylalkyl ether.
  • the PG 1 moiety of either of formulae A and A' is t-butyldimethylsilyl or benzoyl.
  • the PG 1 moiety of either of formulae A and A' is t- butyldimethylsilyl ("TBS").
  • two Q 1 on A are optionally taken together to form a 3- 8 membered saturated, partially unsaturated, or aryl ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur.
  • two Q on A are taken together to form an epoxide ring.
  • the PG 5 and PG 6 groups of formula A and A' are independently selected from those suitable protecting groups described above for the PG group of formula A and A'.
  • the PG 5 and PG 6 groups of formula A and A' are taken together to form a cyclic diol protecting group.
  • diol protecting groups are well known in the art and include those described by Greene and include cyclohexyhdene and benzylidene diol protecting groups.
  • the present invention provides a method for preparing compounds of formula F-2 according to Schemes V-a, V-b, and V-c below: Scheme V-a
  • the present invention provides crystalline ER-817664.
  • Scheme Vl-a shows a general method for using this compound in the preparation of inte ⁇ nediates useful for preparing compounds of formula F-2.
  • the bromo intermediate is treated with triphenylphosphine to form a Wittig reagent in situ in a manner substantially similar to that described by Murphy, et al, Tetrahedron Letters, 40, (1999) 3455-3456.
  • This Wittig reagent then forms the lactone ER-812772.
  • stereoselective hydrogenation of the double bond affords ER-812829.
  • the present invention also provides a method for preparing intermediates useful for preparing compounds of formula F-2 from D-quinic acid, from intermediate ER-812829 depicted in Scheme VII above, as shown in Scheme Vll-a below.
  • the present invention provides a compound
  • each PG is an independently selected suitable hydroxyl protecting group
  • R 3 is CHO or C(O)OR 4 ;
  • R 4 is a suitable carboxyl protecting group
  • LG 2 is a suitable leaving group.
  • Suitable carboxylate protecting groups are well known in the art and are described in detail in Protecting Groups in Organic Synthesis, T. W. Greene and P. G. M. Wuts, 3 rd edition, John Wiley & Sons, 1999.
  • the R 4 group of F-3 is an optionally substituted C 1-6 aliphatic group or an optionally substituted aryl group. Examples of suitable R 4 groups include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, benzyl, and phenyl wherein each group is optionally substituted.
  • suitable leaving groups are well known in the art, e.g., see “Advanced Organic Chemistry,” Jerry March, 4 th Ed., pp. 351-357, John Wiley and Sons, N.Y. (1992).
  • Such leaving groups include, but are not limited to, halogen, alkoxy, sulphonyloxy, optionally substituted alkylsulphonyloxy, optionally substituted alkenylsulfonyloxy, optionally substituted arylsulfonyloxy, silyl, and diazonium moieties.
  • Suitable leaving groups include chloro, iodo, bromo, fluoro, methanesulfonyl (mesyl), tosyl, triflate, nitro-phenylsulfonyl (nosyl), and bromo-phenylsulfonyl (brosyl).
  • the LG 2 moiety of F-3 is iodo.
  • the suitable leaving group may be generated in situ within the reaction medium.
  • LG 2 in a compound of formula F-3 may be generated in situ from a precursor of that compound of formula F-3 wherein said precursor contains a group readily replaced by LG 2 in situ.
  • said precursor of a compound of formula F-3 contains a group (for example, a trimethylsilyl group) which is replaced in situ by LG 2 , such as an iodo group.
  • the source of the iodo group may be, e.g., N-iodosuccinimide.
  • Such an in situ generation of a suitable leaving group is well known in the art, e.g., see Id.
  • each PG 4 taken with the oxygen atom to which it is bound, is independently selected from esters, ethers, silyl ethers, alkyl ethers, arylalkyl ethers, and alkoxyalkyl ethers. Examples of such esters include formates, acetates, carbonates, and sulfonates.
  • Specific examples include formate, benzoyl formate, chloroacetate, trifluoroacetate, methoxyacetate, triphenylmethoxyacetate, p- chlorophenoxyacetate, 3-phenylpropionate, 4-oxopentanoate, 4,4-(ethylenedithio)pentanoate, pivaloate (trimethylacetyl), crotonate, 4-methoxy-crotonate, benzoate, p-benylbenzoate, 2,4,6-trimethylbenzoate, carbonates such as methyl, 9-fluorenylmethyl, ethyl, 2,2,2- trichloroethyl, 2-(trimethylsilyl)ethyl, 2-(phenylsulfonyl)ethyl, vinyl, allyl, and p-nitrobenzyl.
  • silyl ethers examples include trimethylsilyl, triethylsilyl, t-butyldimethylsilyl, t- butyldiphenylsilyl, triisopropylsilyl, and other trialkylsilyl ethers.
  • Alkyl ethers include methyl, benzyl, p-methoxybenzyl, 3,4-dimethoxybenzyl, trityl, t-butyl, allyl, and allyloxycarbonyl ethers or derivatives.
  • Alkoxyalkyl ethers include acetals such as methoxymethyl, methylthiomethyl, (2-methoxyethoxy)methyl, benzyloxymethyl, beta- (trimethylsilyl)ethoxymethyl, and tetrahydropyranyl ethers.
  • arylalkyl ethers include benzyl, p-methoxybenzyl (MPM), 3,4-dimethoxybenzyl, o-nitrobenzyl, p- nitrobenzyl, p-halobenzyl, 2,6-dichlorobenzyl, p-cyanobenzyl, 2- and 4-picolyl.
  • one, two, or three of the PG 4 moieties of F-3 taken with the oxygen atom(s) to which they are bound, are silyl ethers or arylalkyl ethers.
  • one, two, or three of the PG 4 moieties of F-3 are t-butyldimethylsilyl or benzyl.
  • all three of the PG 4 moieties of F-3 are t- butyldimethylsilyl.
  • a compound of formula F-3 wherein said compound has the stereochemistry as depicted in formula F-3':
  • a compound F-3a is provided:
  • TBS t-butyldimethylsilyl
  • Scheme VIII above shows a general method for preparing intermediate F-5a from fragments F-1 and F-2.
  • fragments F-1- and F-2- are coupled using methods substantially similar to that described by Kishi, et al., Org Lett 4:25 p 4431 (2002) to afford intermediate F-4.
  • This coupling is performed in the presence of the chiral oxazole (ER- 807363) or, alternatively, in the absence of ER-807363.
  • the coupling reaction of F-1 and F-2 proceeds with higher selectivity when performed in the presence of ER-807363.
  • Intramolecular Williamson ether formation of F-4 by treating F-4 with potassium hexamethyldisilazide, then furnishes tetrahydropyran F-5 as a mixture of stereoisomers. The stereoisomers are then separated to afford F-5a. The details of these steps are set forth in the Examples infra.
  • the present invention provides a compound F-4:
  • the present invention provides a compound of formula F-4 wherein said compound has the stereochemistry depicted in formula F-4':
  • the present invention also provides a compound F-4a:
  • the present invention provides a compound
  • each PG 1 , PG 2 , PG 3 , and R 1 is as defined in general and in subclasses above and herein.
  • the present invention provides a compound of formula F-5 having the stereochemistry as depicted in formula F-5' or F-5a:
  • Scheme IX above shows a general method for preparing an intermediate F-9 from F-3a and F-6.
  • the sulfone intermediate F-6 is treated with «-butyl lithium then with the aldehyde F-3a.
  • the resulting diol intermediate F-7 is then oxidized with Dess-Martin reagent to form the ketone-aldehyde intermediate F-8 which is then treated with Sml 2 to afford intermediate F-9.
  • the details of these steps are set forth in the Examples infra.
  • Scheme X above sets forth a general method for preparing the Halichondrin B analogs of the present invention from F-9a (LG 2 is iodo).
  • an intramolecular coupling is achieved, by conditions substantially similar to those described at Scheme V above, to form hydroxyl compound F-10.
  • the intramolecular coupling is performed in the presence of the chiral oxazole ligand, described herein.
  • the addition of the chiral oxazole ligand imparts a higher yield and greater efficiency for the reaction.
  • the details of this reaction are set forth in the Examples below.
  • Compound F-10 is then oxidized to form F-ll.
  • the hydroxyl protecting groups of F-ll are removed by appropriate means to afford F-12.
  • Halichondrin B-1939 One of ordinary skill in the art would recognize that many analogs of Halichondrin B are prepared by the methods and from the compounds of the present invention including, but not limited to, those analogs of Halichondrin B described in United States Patents 6,214,865 and 6,365,759, the entirety of which are herein incorporated by reference. Accordingly, it will be appreciated that the synthetic methods described below, by way of example, do not limit the scope of the invention which is defined by the appended claims.
  • ER- 806050 was isolated as a tBuOH solution (2.5 vol.) after concentration at reduced pressure (95% yield).
  • AllylTMS (1.03 wts, 4.8 eq.) was premixed with ER-806053/54 (1 wt, 1 eq.), available as a 22 wt% solution in toluene from the previous step (4.55 wts, 1 eq.), and added to the freshly generated Ti(OiPr)Cl 3 .
  • the internal temperature during the addition was kept below 30°C.
  • the reaction was stirred between 20-30 °C for 2 hours.
  • the reaction was cooled to -5°C and quenched with IN HCI (6 vol.), keeping the internal temperature below 30 °C. After mixing well, the layers were separated and the organic layer sequentially washed with IN HCI (3 vol.) and brine (2 x 3 vol.).
  • ER-806059 was dissolved in 1 : 1 toluene/CH 3 CN (5 vol.) at room temperature. Filtered TMSI (1.23 wt., 4 eq.) was added, keeping the initial temperature below 40 °C. The reaction was heated to 60°C for 2 hours. The reaction was cooled to -15 ° and quenched with 25% aqueous ammonium hydroxide below 30°C. The reaction contents were stirred overnight and the layers separated. The organic layer was charged with additional toluene (5 vol.) and water (2 vol.). The layers were mixed well and separated.
  • the reaction was cooled to ⁇ 10 °C and quenched with water (3.2 vol.) keeping the internal temperature below 20 °C.
  • the layers were mixed well and separated.
  • the organic layer was sequentially washed with aqueous sodium bicarbonate (2 x 5 vol.) and water (2 x 5 vol.).
  • the organic layer was concentrated and solvent exchanged to afford a 40 wt% solution of ER- 806061 in MeOH.
  • ER-806068 (1 wt., 1 eq.) was dissolved in 1 vol. of MeOH. Water (1.5 vol.) and 2
  • ER-806065 (1 wt., 1 eq.) was dissolved in heptane, isooctane, or IPA (10 vol.) The solution was cooled below -60 °C ( ⁇ 10 °C). Ozone was bubbled through the solution at low temperature until the solution retained a blue color. Nitrogen was purged through the solution for 15-30 minutes, and the reaction warmed to 5 °C while the nitrogen flush was continued. 7-15 wt. %> Lindlar Catalyst (5% Pd on CaCO 3 poisoned with Pb, 0.1 wt.) was added. The reactor head was purged several times with nitrogen, evacuated, and placed under 1 atmosphere H 2 (g).
  • a reactor was charged with pre-rinsed Amberlyst 15 (0.05 wt.) and water (4.63 vol.) and cooled to an internal temperature of 0-5°C.
  • the reactor was charged with 2,3- dihydrofuran (1 wt., 1 eq.) and stirred for 1.5 hours maintaining internal temperature around 5°C.
  • a second reactor was charged with water (4.63 vol.) and heated to an internal temperature of 35°C.
  • the same reactor was charged with tin powder (2.2 wt., 1.3 eq.), distilled 2,3-dibromopropene (3.71 wt., 1.3 eq.), and 48%) hydrobromic acid (0.002 vol.), respectively.
  • the second reactor was charged with 2,3-dibromopropene portion-wise (9 x 0.37 wt.) while maintaining the internal temperature below 45 °C. After complete addition, the contents of the second reactor were stirred at an internal temperature of 35°C for an additional 60 minutes. The filtered contents of the first reactor were charged into the second reactor at a rate such that internal temperature did not exceed 45°C. After complete addition, the heat source was removed and the second reactor was charged with Celite ® 545 (2.0 wt.) and the resulting mixture stirred for 30 minutes. The heterogeneous mixture was filterred through a Celite ® 545 pad (2.0 wt.) and the cake washed with additional water (5 vol.).
  • a reactor was charged with imidazole (0.65 wt., 2 eq.), ER-806909 (1 wt., 1 eq.), and anhydrous DMF (4.04 vol.). With stirring, the reactor was cooled to an internal temperature of 0°C and then with tert-butylchlorodiphenylsilane (1.25 wt., 0.95 eq.) at a rate such that internal temperature did not exceed 15°C. While maintaining the internal temperature ⁇ 15°C, the reaction was stirred for an additional 1 hour. The reactor was charged with water (3.2 vol.) and n-heptane (6.4 vol.). The mixture was stirred for 5-15 minutes and the layers allowed to separate.
  • ER-806909 The enantiomers of ER-806909 were separated via Simulated Moving Bed (SMB) chromatography to yield ER-808373 (0.55 wt., 0.55 eq.) and ER-806721 (0.45 wt., 0.45 eq.) as yellow oils.
  • SMB chromatography protocol used to separate the enantiomers of ER-806909 is as follows.
  • Solvent system 96:4 (vol/vol) heptanertert-butanol (mobile phase) Simulated Moving Bed
  • ER-806909 The enantiomers of ER-806909 were separated using the above protocol in the following manner.
  • 10 L of 36 g/L ER-806909 in mobile phase was pumped (Silog model Chemtech) through a 142 mm diameter 0.45 ⁇ m pore size nylon filter (Cole-Parmer # 2916-48) and into the Feed tank.
  • the Eluant tank was filled with 36L mobile phase that has been filtered through an in-line 45 mm diameter 1 ⁇ m glass fiber filter (Whatman GFC), additional vol. were added throughout the run.
  • the internal temperature of the SMB apparatus was adjusted to 27 °C.
  • the Feed and Eluant inlets were both connected to the Eluant tank.
  • the Feed and Eluant pumps were primed and purged with mobile phase solvent.
  • the SMB apparatus column switching was initiated, the pumps were turned on and the flow rates were gradually increased to full speed while maintaining absolute flow rate differences between each pump. Once full speed was achieved the Raff ⁇ nate and Extract flow rates were measured and adjustments to pump flow rates were made to correct for deviations in pump specifications.
  • the Feed pump (Pump 1) was reduced to 0 mL/min, the inlet reconnected to the Feed tank, the pump primed with Feed solution and then the flow rate gradually increased back to full operating speed.
  • the Raffmate and Extract outlets were collected into separate tanks and samples of each of each were acquired every 2 hours. The samples were monitored for chiral purity by analytical HPLC using the HPLC method set forth below. Adjustments to the flow rates of Pumps 2, 3 and 4 as well as to the tact time were made to afford the desired outlet purities.
  • the Feed pump was once again reduced to zero flow rate and connected to the Eluant tank.
  • the Feed pump was brought back to full speed and the system was allowed to wash for 20 minutes.
  • the Raffmate and Extract outlets were maintained for 10 minutes (10 tacts) during the wash period and, for the remainder of the wash, the outlets were collected into a separate tank.
  • the column wash was eventually concentrated and added to the Feed on subsequent runs.
  • the filter-calce was washed with n-heptane (3.3 vol.), TBME (0.55 vol.), n-heptane (1.1 vol.), and MTBE (0.55 vol.), respectively. All filtrates were combined and concentrated in vacuo.
  • the crude concentrate was dissolved in THF (8 vol.) then water (0.8 vol.) and lithium hydroxide dihydrate (0.18 wt., 2 eq.) were added. The mixture was stirred at ambient temperature then n-heptane (3.3 vol.) was added and stirred for 5 minutes. Water (2.2 vol.) and n-heptane (3.3 vol.) were added, the biphasic mixture was stirred for 5 minutes, and the layers were allowed to partition.
  • a reactor was charged with ER-806721 (1 wt., 1 eq.) and anhydrous dichloromethane (4.2 vol.). The reaction was cooled to an internal temperature of 0-5 °C, then triethylamine (0.34 wt., 1.5 eq.), p-toluenesulfonyl chloride (0.51 wt., 1.2 eq.), and 4- (dimethylamino)-pyridine (0.001 wt., 0.25 eq.) were added. The resulting mixture was stirred at ambient temperature for 48 hours then water (1.8 vol.) and dichloromethane ( 1.8 vol.) were added. After sufficient mixing, the organics were separated and concentrated the organics.
  • the concentrate was dissolved in MTBE (1.8 vol.) and washed with brine (1.8 vol.). The organic layer was separated and set aside. The aqueous layer was back extracted with MTBE (1.8 vol.) then all organics were combined and concentrated in vacuo.
  • the crude oil was filtered through a plug of SiO 2 (70-230 mesh, 1 wt.) eluting with MTBE (7 vol.) and the filtrates were concentrated in vacuo.
  • the conentrate was dissolved in IP A (5 vol.) and water (0.25 vol.) was added. The resulting mixture was cooled to an internal temperature of 15 °C and then seeded with ER-807204.
  • a reactor was charged with 21%> sodium ethoxide in ethanol (2.97 wt., 0.9 eq.). The solution was heated to an internal temperature of 65°C then diethyl malonate (3.24 wt., 2 eq.) was added at a rate such that the internal temperature did not exceed 70°C. The mixture was stirred for 30 minutes and then ER-806906 (1 wt., 1 eq.) was added over 3-5 hours. Upon complete addition, the reaction was stirred for 60 minutes and then cooled to an internal temperature of 50°C. Concentrated hydrochloric acid (0.84 wt., 1.05 eq.) was added at a rate such that internal temperature did not exceed 65°C.
  • a reactor was charged with LHMDS 1.0 M in toluene (6.61 wt., 1.04 eq.) and cooled to an internal temperature of -75 °C.
  • ER-805552 (1 wt., 1 eq.) was dissolved in anhydrous THF and added to the reactor at a rate such that internal temperature did not exceed -70°C. Upon complete addition, the resulting mixture was stirred for 30 minutes.
  • a second reactor was charged with anhydrous THF (2.5 vol.) and methyl iodide (1.27 wt., 1.25 eq.) and cooled to an internal temperature of -75°C.
  • the reaction was diluted with CH 2 C1 2 (15 vol.) then inverse quenched into 1.3 M sodium tartrate (20 vol.) at an internal temperature of 0°C at a rate such that the internal temperature did not exceed 10°C.
  • the layers were partitioned and the aqueous layer was separated and set aside. The organics were washed with water (1 vol.), dried over sodium sulfate (1 wt.), filtered and concentrated in vacuo until minimal methylene chloride was being removed.
  • To the concentrate was added anhydrous DMF (6.3 vol.), imidazole (0.64 wt., 1.5 eq.) and t-butyldimethylsilyl chloride (0.94 wt., 0.97 eq.), respectively.
  • a reactor was charged with ER-806753 (1 wt., 1 eq.), CH 2 C1 2 (5 vol.) and NMO- 50% in water (0.8 wt., 1.1 eq.). The mixture was cooled to an internal temperature of 10°C and then 0.197 M OsO 4 in toluene (0.06 vol., 0.004 eq.) was added. Sodium sulfite (0.1 wt., 0.25 eq.) and water (0.85 vol.) were added and the reaction stirred for 1 hour. The mixture was diluted with brine (0.85 vol.) and the organics were concentrated in vacuo to approximately 1/3 vol.
  • a second reactor was charged with sodium periodate (1.3 wt., 2 eq.) followed by THF (2.5 vol.).
  • the concentrated diol was added at a rate such that the internal temperature did not exceed 30°C.
  • the resulting mixture was stirred at room temperature.
  • Water (1.25 vol.), MTBE (7 vol.) and brine solution (1.25 vol.) were added and the layers separated. The organics were washed a second time with a mixture of brine solution (1 vol.) and saturated sodium bicarbonate (1 vol.).
  • a reactor was charged with ER-806629 (1.53 wt., 3.1 eq.) and THF (10.5 vol.) and the solution was degassed with nitrogen sparge for 60 minutes.
  • a second inerted reactor was charged with ER-807204 (1 wt., 1.0 eq.), ER-806754 (0.66 wt., 1.2 eq.) and THF (2.7 vol.) and this solution was degassed with argon sparge for 45 minutes.
  • a reactor containing ER-806906 was charged with CrCl 2 (0.63 wt., 3.1 eq.) and followed by Et 3 N (0.52 wt., 3.1 eq.).
  • the dark green suspension was stirred at an internal temperature of 30 to 35°C for 1 hour, cooled to 0 to5 °C and then NiCl 2 (0.1 eq.) was added.
  • the first reactor was charged with the contents of the second reactor slowly over 0.5 hours and the reaction allowed to warm to rt.
  • the reaction was cooled to an internal temperature of 0 °C then ethylenediamine (1.0 wt., 10 eq.) was added over 30 minutes and the reaction stirred at an internal temperature of 25°C for at least 30 minutes.
  • To the reaction was added water (4 vol.), TBME (10 vol.) and n-heptane (1 vol.) and the resulting mixture stirred for 15 minutes and the phases allowed to separate ( ⁇ 30 min).
  • aqueous phase was separated and back extracted with TBME (-7.5 vol.). The organic layers were combined and washed with water (5 vol.), brine (3 vol.), and concentrated in vacuo to minimum volume.
  • IPA 10 vol.
  • SiO 2 1 wt.
  • the slurry was filtered and the filter cake washed with IPA (2 X 1 volume).
  • n-heptane 6.6 vol.
  • the mixture was concentrated in vacuo until a suspension formed.
  • the mixture was filtered and the cake washed with n-heptane then the mixture was concentrated in vacuo.
  • a reactor was charged with ER-807524 (1 wt., 1 eq.) and anhydrous THF (1.25 vol.). The mixture was cooled to an internal temperature of -20 °C and 3 M methyl magnesium chloride (0.59 vol., 1.2 eq.) was added at a rate such that the internal temperature did not exceed 0°C. Upon complete addition, the mixture was warmed to an internal temperature of 0°C over 2 hours. The reaction mixture was inverse quenched into semi- saturated ammonium chloride (2.62 vol.) and the resulting mixture diluted with TBME (2 vol.) with vigorous mixing. The aqueous layer was discarded and the organics washed with brine (2 vol.) then concentrated in vacuo. The crude product was purified via SiO 2 column chromatography to yield ER-807525 (0.79-0.82 wt., 0.85-0.88 eq.) as yellow oil.
  • a reactor was charged with ER-807525 (1 wt., 1 eq.), N- phenylbistrifluoromethanesulfonamide (0.59 wt., 1.1 eq.), and anhydrous THF (4.1 vol.) and the mixture cooled to an internal temperature of -75°C.
  • 0.5 M KHMDS in toluene (2.75 wt., 1 eq.) was added at a rate such that internal temperature did not exceed -60°C then the reaction was warmed to-20°C over 2 hours.
  • the reaction was quenched with semi-saturated NH 4 C1 (2.4 vol.) at a rate such that internal temperature did not exceed 0°C.
  • a reactor was charged with ER-807526 (1 wt., 1 eq.) and anhydrous methanol (3 vol.) at 20°C. 1.25M HCI in IPA (4 vol., 5 eq.) was added and the mixture stirred for 3 hours. Solid NaHCO 3 (0.42 wt., 5 eq.) was added portion-wise with stirring until the pH of the reaction mixture reached 6-7. The reaction mixture was filtered with methanol (3 x 2 vol.) washes. All filtrates were concentrated in vacuo and then purified via SiO 2 column chromatography to yield ER-807527 (0.43 wt., 0.79-0.85 eq.).
  • ER-807527 was separated by preparative HPLC cliromatography and the desired fractions concentrated to yield ER-806730 (0.56 wt., 0.56 eq.) as a clear yellow oil.
  • the preparative HPLC chromatography protocol used to isolate ER-806730 is as follows.
  • a reactor was charged with ER-806730 (1 wt., 1 eq.) and anhydrous dichloromethane (4.8 vol.) and cooled to an internal temperature of 0°C. 2,4,6-Collidine (1.16 wt., 4 eq.) and DMAP (0.03 wt., 0.1 eq.) were added and the resulting mixture stirred for 15 minutes and then trimethylacetyl chloride (0.3 wt., 1.05 eq.) was added at a rate such that internal temperature did not exceed 10°C. Water (3 vol.) was added and the mixture stirred for 15 minutes. TBME (10 vol.) was added and the mixture stirred for an additional 10 minutes.
  • a reactor was charged with ER-806732 (1 wt., 1 eq.) and anhydrous THF (2.35 vol.) and cooled to an internal temperature of 0°C.
  • Triethylamine (0.22 wt., 1.1 eq.) was added followed by methanesulfonyl chloride (0.24 wt., 1.05 eq.) at a rate such that internal temperature did not exceed 10°C.
  • the reaction was stirred at an internal temperature of 0°C then n-heptane (3.4 vol.) was added with vigorous stirring and the layers were allowed to partition.
  • the resulting mixture was allowed to stir for 3-4 hours and the layers allowed to separate.
  • the aqueous layer was extracted with MTBE (5 v) and the combined organics were washed with a water (5 v).
  • the extracts were solvent exchanged with IPA by distillation to provide a solution of 2c in IPA (3 v).
  • the solution was cooled to 5 °C and the resulting crystalls were filtered.
  • the mother liquor was concentrated and a second crop obtained after recrystallization to provide 2c (0.87 wt) as a white crystalline solid.
  • AlMe 3 (2 M in toluene, 1.5 eq, 1.5 v) was added to a suspension of dimethylhydroxylamine hydrogen chloride (1 wt) in CH 2 C1 2 (2.5 v) at 0 °C.
  • the reaction mixture was then added to aqueous sodium tartrate (1.3 M, 20 v) keeping the temperature below 10 °C.
  • the layers were allowed to partition, were separated, and the organic layer was dried with Na 2 SO 4 (5 wt).
  • the resulting suspension was filtered and the filtrate concentrated.
  • Methyl magnesium chloride (3.0 M, 59 wt, 1.2 eq) was added to a solution of 21 (1 wt) in anhydrous THF (1.11 wt, 1.25 v) at a rate that maintained the reaction temperature below 0 °C. After stirring at 0°C, the reaction was reverse quenched into saturated ammonium chloride (2.5 v) and water (2.3 v). The resulting mixture was diluted with MTBE (10 v) and stirred vigorously. The aqueous layer was separated and the organic layer washed with brine (2.5 v) and concentrated to provide 22 (0.84 wt).
  • Example 4a provides an alternate method of preparing compounds of formula A, an intermediate to F 2, using the general scheme set forth at Scheme V above. This method uses ER-812935 as an intermediate as prepared according to Example 3 (compound 4), above.
  • ER-812935 (1 wt) was dissolved in THF (10 v) and cooled to 0°C. LAH (1.0 M in THF, 0.70 eq, 2.0 v) was added keeping the temperature below 5°C. While stirring vigorously, excess reagent was quenched with water (0.078 v) keeping the temperature below 5°C. While maintaining the vigorous stirring, NaOH (15% wt/wt in water (0.078 v)) was added followed by water (0.18 v). After adding Celite ® (2 wt), the suspension was filtered and the cake rinsed with THF (5 v). The solution of ER-817633 (0.92 wt, calcd. based on 100% conversion) was concentrated to 5 v and used directly in the next stage.
  • ER-818950 was dissolved in acetic acid (5 v) and hydrogen chloride (1.0 M, 1 eq, 3 v) was added and the reaction was stirred at ambient temperature. The reaction was cooled to 0 °C and NaOH (50% wt/wt, 30eq, 7 wt) was added at a rate that maintained the T below 10 °C. The solution was extracted with heptane (2 x 10 vol). The aqueous phase was saturated with NaCl and extracted with ACN (2 x 10 v). The combined ACN extracts were concentrated and solvent exchanged with EtOAc by atmospheric distillation to provide a solution of ER-817664 in EtOAc (3 v). Salts were filtered from the hot solution which was then cooled to 0 °C. The suspension was filtered to provide ER-817664 as a white crystalline solid.
  • Example 4b provides an alternate method of preparing compounds of formula F-2 using the general scheme set forth at Schemes Vb and Vc above. This method uses ER- 817664 as an intermediate as prepared according to Example 4a, above.
  • ER-817664 (1 wt) was dissolved in ACN (10 v), the suspension was cooled to 0°C and 2-acetoxy-2-methylpropanyl bromide (4.0 eq, 2.4 v) was added followed by the addition of H 2 O (1.0 eq., 0.07 v). The resulting mixture was stirred at 0 °C for 2 hours. NaHCO 3 (sat. aqueous, 8.0 eq. 40 v) was added slowly at 0 °C. The resulting mixture was stirred at room temperature for 30 minutes prior to extraction with MTBE (2 x 20 v). The organic layer was washed with brine (5 v) and concentrated to give the product as colorless oil.
  • the reaction was neutralized with IN HCI ( ⁇ 4 eq, -20 v) at 0°C and the solution was extracted with MTBE(10 v) to remove lypophilics. The aqueous layer was concentrated to remove CH 2 C1 2 and MeOH. THF (4 v) was added followed by NaIO (2 eq, 2 wt). The reaction was extracted with MTBE (10 v) and n-BuOH (10 v). The combined organic extracts were concentrated and the resulting powder was triturated with EtOAc. After filtration the lactol was isolated as a pale yellow powder.
  • ER-818638 (lwt) and LiCI (2.0eq, 0.35 wt) was stirred in ACN (8.7 v). Hunigs base (1.5 eq) was added at 25 °C. 1 N HCI (5 v) was added and the mixture was extracted with MTBE (10 v). The organics were concentrated to provide ER-818640 which was used as is in the next step.
  • Example 4c provides another alternate method of preparing compounds of formula F-2 using the general scheme set forth at Scheme VII above. This method uses ER- 811510 as an intermediate as prepared according to Example 3, above where acetone is used instead of cyclohexanone.
  • ER-811510 (lwt, 1 eq) was dissolved in methylene chloride (6.3 v) and cooled to -5°C. Pyridine (0.41 vol, 1.1 eq) was added followed by bromoacetyl bromide (0.44 vol, 1.1 eq) while keeping the temperature below 0°C. The reaction was stirred at 1 hour and warmed to room temperature. Water (8 vol) was added and the layers separated. The organic layer was washed sequentially with aqueous copper sulfate pentahydrate (1.0 M, 10 vol), water (8 vol), and brine (10 vol) then dried over magnesium sulfate, filtered and concentrated in vacuo to afford ER-812771 as a tan solid.
  • ER-812771 (lwt, 1 eq) was dissolved in acetonitrile (6 v) and triphenylphosphine was added and the reaction heated at 50°C for 45 minutes. The reaction was cooled to -10°C then l,8-diazabicyclo[5.4.0]undec-7-ene (DBU, 0.35 vol, 0.8 eq) was added. The reaction was stirred for 15 minutes, heated to 80°C for 45 minutes then cooled to ambient temperature. Ammonium chloride (saturated aqueous, 10 vol) was added and the aqueous layer extracted with ethyl acetate (3 x 10 v). The combined organic layers were dried over magnesium sulfate and concentrated in vacuo. The crude product was purified by chromatography to afford ER-812772 as a white solid.
  • DBU l,8-diazabicyclo[5.4.0]undec-7-ene
  • ER-812772 (lwt, 1 eq) was dissolved in ethyl acetate (8 v). 10% Palladium on carbon (0.05 wt, 0.01 eq) was added, the reaction purged with nitrogen then stirred under hydrogen atmosphere for 2 hours. The catalyst was removed by filtration through Celite with ethyl acetate washed. The combined filtrates were concentrated in vacuo to afford ER- 812829 as a white solid.
  • ER-805715 (1 wt., 1 eq.) was charged to reaction vessel and dissolved in anhydrous THF (3.34 vol.) and anhydrous toluene (2.5 vol.). The mixture was cooled to -15 to -10 °C. DIBALH (1.5M in toluene, 2.4 vol., 1.2 eq.) was added over 1 hour and the mixture stirred for 15-30 minutes at -15 to -10 °C. The reaction was inverse quenched into KNa-Tartrate solution (1 wt. KNa Tartrate in 2.9 wt. water) at 10°C and the resulting mixture allowed to warm to room temperature and stir for 4 hours. The mixture was filtered then the layers separated and extracted with MTBE (2 vol.). The organic layers were combined and the solvents removed in vacuo to afford ER-805814. Yield 100%, (1.02 wt.).
  • ER 805814 (1 wt.) was dissolved in anhydrous THF (3.3 vol.) and treated with (methoxymethyl)triphenylphosphonium chloride (2.11 wt., 2.1 eq.). The reaction mixture was heated to 28-32 °C then a solution of KOtBu (0.66 wt., 2 eq.) in anhydrous THF (2.64 vol.) was added over 100-140 minutes, maintaining reaction temperature 30-35 °C. After 5 hours, the reaction was cooled to 20-25 °C, MTBE (5.11 vol.) was added and the mixture stirred.
  • ER-805815 (0.88 wt., 81% yield).
  • a solution of t-BuOK (0.989 wt, 3 eq) in THF (4 wt) was added to a suspension of (methoxymethyl)triphenylphosphonium chloride (3.12 wt, 3.1 eq) in THF (1.78 wt), maintaining the reaction temperature between 0- 10 °C.
  • the addition vessel was rinsed with THF (2 x 0.7 wt).
  • a solution of ER-805814 (1 wt, 1 eq) in THF (1.42 wt) was added to the reaction, maintaining 0-10 °C.
  • the addition vessel was rinsed with THF (2 x 0.7 wt). The mixture was stirred at 20-30 °C overnight and 30-35 °C for 3 hours. The reaction was cooled below 30 °C and diluted with MTBE (3.7 wt) followed by 10 wt% aqueous NaCl (4 wt) solution. The mixture was stirred for 30 minutes and the layers were separated. Maleic anhydride (0.63 wt, 2.2 eq) was added and the mixture stirred at room temperature for 30 minutes. Water (6 wt) and a solution of NaOH (48 wt%, 0.64 wt, 2.6 eq) was added dropwise, maintaining the reaction below 15 °C. After stirring below 15 °C, the lower layer was separated.
  • ER-805815 (1 wt) was dissolved in acetone (2.4 vol) and water (0.4 vol). N-Methylmorpholine N-oxide (0.62 wt, 2 eq) was added and the mixture cooled to 0-5 °C. OsO 4 (0.15M in water, 0.065 vol) was added and the reaction was maintained at 0-5 °C. The reaction mixture was stirred at 0-5 °C for 12 hours. Water (0.2 vol) was added over 1 hour at 0-2°C. The mixture was stirred for one hour at 0-5 °C.
  • ER-805816 (0.526 wt, 52% yield, residual Os ⁇ 17 ppm).
  • a solution of ER-805815 (1 wt, 1 eq) in acetone (4 wt) was charged into a four-necked flask, then water (0.5 wt) was added at ambient temperature. To the mixture was added anhydrous N-methylmorpholine-N-oxide (0.38 wt, 1.2 eq).
  • Potassium osmate dihydrate (0.003 wt, 0.003 eq) was added portion- wise at 25 to 35 °C while cooling with water. The mixture was kept at this temperature for 4 hours. A solution of sodium thiosulfate 0.075 wt, 0.49 eq) in water (0.5 wt) was added at ambient temperature, then the mixture was stirred for 0.5 hour. The mixture was cooled to 0-5 °C and stirred for 2 hours. The resulting precipitate was collected and the wet calce was washed with methanol (0.6 wt) and water (1.5 wt) to obtain the crude product (1.25 wt). The crude product sample was dried (0.611 wt).
  • the crude ER-805816 (1.25 wt) was added to water (3.05 wt) and stirred for 2 hours at about 25 °C.
  • the precipitate was filtered and washed with water (1.53 wt) to afford the crude wet calce (1.05 wt).
  • the crude ER-805816 (1.05 wt) was added to water (2.81 wt) and stirred for 2 hours at about 25 °C.
  • the precipitate was filtered and washed with water (1.4 wt) and methanol (0.45 wt) to afford the crude ER-805816 (0.736 wt).
  • ER-805816 (0.56 wt) was dissolved in acetone (1.76 wt) at 45 to 55°C.
  • active carbon 0.027 wt
  • the mixture was filtered and the calce was washed with hot acetone (0.214 wt).
  • the filtrate was kept at 45 to 50°C and water (0.83 wt) was added over 10 minutes and temperature was kept at 40 to 50°C during water addition.
  • the mixture was cooled to 0 to 5 °C and stirred for 1.5 hours.
  • ER-805816 (1 wt) was slurried in acetic acid (0.89 vol, 5.8 eq) and acetic anhydride (3.57 wt, 13 eq). Anhydrous ZnCl 2 (0.2 wt, 0.54 eq) was added. Reaction mixture was stirred for 24 hours 18-22 °C. Reaction was quenched into ice (5 wt) and water (5 vol). EtOAc (10 vol) was added with stirring and the aqueous layer is separated. The aqueous layer was back extracted with EtOAc (10 vol). The combined organic layers were washed sequentially with brine (10 vol), 5% aqueous NaOAc (6 vol), and brine (6 vol). The organic layer was concentrated.
  • ER-805819 (1 wt) was dissolved in anhydrous acetonitrile (15 vol) and treated with ER-803055 (0.93 vol, 2 eq). The reaction mixture was cooled to 0 -5°C and BF 3 -OEt 2 (0.54 vol, 1.95 eq) was added over 5 minutes, maintaining reaction temperature between 0-5 °C. Reaction mixture was stirred 0-5 °C for 12 hours. Reaction was quenched into saturated sodium bicarbonate (20 vol) with vigorous stirring. Extracted twice with EtOAc (2 x 8 vol). The combined organics were washed with brine (12 vol) and concentrated to give ER- 805821 (1 wt, 88% yield, use as is).
  • ER 805819 (1 wt, 1 eq) and ER 803055 (0.93 vol, 2 eq) were dissolved in anhydrous acetonitrile (5.46 wt, 7 vol).
  • the reaction mixture was cooled to 0-5 °C and BF 3 -OEt 2 (0.54 vol, 1.95 eq) was added over 5 minutes, while maintaining reaction temperature between 0-5 °C.
  • the reaction mixture was stirred at 0-5 °C for 20 hours then heptane (5.47 wt, 8 vol) was added at 0-5 °C.
  • ER-805821 (1 wt) was dissolved in anhydrous THF (8.4 vol) and anhydrous MeO Ac (2 vol). Triton B(OH) (3.6 vol) was added over 2 minutes, reaction maintained 17- 23 °C. Reaction was stirred for 1.5 hour. Reaction mixture was filteredwt. The filtrate was concentrated and passed through a pad of SiO 2 (5 wt, EtOAc, 20 vol). The filtrate was washed with brine (2.2 vol) and evaporated to give ER-805822 (0.54 wt, 72% yield).
  • ER-805821 (1 wt, 1 eq, 11.18 g, 21.81 mmol) was dissolved in anhydrous MTBE (4.4 wt, 6 vol.) and cooled to 0-5 °C.
  • NaOMe 28wt% in MeOH, 0.564 wt, 1.5 eq
  • the reaction was quenched by addition of acetic acid (0.188 wt, 1.6 eq.), maintaining 0-5 °C during addition.
  • ER 805822 (1 wt) was dissolved in ethyl acetate or another appropriate solvent (5 vol) and water (5 vol).
  • NaIO 4 (0.58 wt, 1.05 eq) is added portionwise over 30 min to 1 hour, maintaining reaction temperature 0-10 °C. Reaction is stirred for up to 2 hours.
  • the reaction mixture was treated with NaCl (1 wt) and stirred for 30 min at 0 to 10 °C.
  • the reaction mixture was filtered and the cake is rinsed with with ethyl acetate (2 vol).
  • the phases were separated and the lower layer extracted with EtOAc (5 vol) three times.
  • the combined organic layer was washed with 20% aqueous NaCl (5 wt).
  • the organic layer was concentrated to give ER 804697 (1 wt).
  • the residue was dissolved in toluene (2 vol) and the solution concentrated.
  • the residue was dissolved in acetonitrile (7 vol) and used for the next step.
  • NiCl 2 (0.025 wt) and CrCl 2 (2.5 wt) were charged to reaction vessel under inert atmosphere.
  • Anhydrous dichloromethane (5 vol) was charged. Stirring was initiated and the mixture was cooled to 0-3 °C.
  • Anl ydrous DMSO (6.7 vol) was added with vigorous stirring over 45 minutes, maintaining temperature below 20 °C.
  • ER-804697 (1 wt) was dissolved in anhydrous dichloromethane (1 vol) and charged to the reaction vessel. The resulting mixture was warmed to 25 °C and ER-806643 (2.58 wt) was added neat over 20 minutes. The reaction temperature was maintained below 45 °C.
  • this reaction was performed in the presence of the chiral ligand ER-807363 in a manner substantially similar to that described for the preparation of ER-118047, infra.
  • the reactor was charged with layer 1, methanol (2.8 wts), and MTBE (2.8 wts). The mixture was stirred overnight. The lower layer was separated and discarded. The upper layer was treated with layer 2. The mixture was stirred for 1 hour and the lower layer was separated and discarded. The upper layer was treated with layer 3 and heptane (4.8 wts). The mixture was stirred for 1 hour and the lower layer was separated and discarded. The upper layer was drained and saved (organic 2). The reactor was charged with layer 3, MTBE (0.8 wts), and heptane (2.7 wts). The mixture was stirred for 1 hour and the lower layers was separated and discarded. The upper layer was combined with organic 1 and organic 2.
  • ER 804698 (1 wt, 1 eq) was treated with AcOH (4.2 wts) and water (4.2 wts). The mixture was heated to 90-97 °C for 100 min. The mixture was cooled to below 15 °C then washed with heptane (2 x 2.7 wts) twice below 15 °C. After phase separation, a mixture of 20wt% aqueous KHCO 3 solution (7.7 wts, 35 eq) and MTBE (5.95 wts) was added dropwise to the lower layer such that temperature does not exceed 15 °C.
  • a pre-dried glass lined reactor was charged with triphosgene (1 wt., 1 eq.) and anhydrous THF (2 vol.) and was cooled to an internal temperature of -10 °C.
  • a second pre- dried glass lined was charged with ER-807244 (1.27 wt., 2.5 eq.) and anhydrous THF (3 vol.) then cooled to an internal temperature of -10 °C.
  • the contents of the first reactor were transferred into the second reactor at a rate such that internal temperature did not exceed 15 °C. After complete addition, the reaction was stirred at an internal temperature of 0°C for 1 hour and then gradually warmed to 25°C.
  • ER-808056 (1 wt., 1 eq.), pyridine (3 wt., 11.4 eq.) and DMAP (0.03 wt., 0.05 eq.).
  • the reaction was cooled to an internal temperature of-10°C then methanesulfonyl chloride (1.46 wt., 3 eq.) was added at a rate such that internal temperature was below 15°C.
  • methanesulfonyl chloride (1.46 wt., 3 eq.) was added at a rate such that internal temperature was below 15°C.
  • the reaction was stirred at an internal temperature of 0-15 °C for 1 hour and then slowly warmed to 25°C over 2 hours.
  • MTBE (2.6 vol.), was added followed by process water (2 vol.) at a rate such that the internal temperature did not exceed 35°C.
  • ER-806629 or ER-807363 was collected by filtration with n-heptane (2 X 3 vol.) washes. A second crop of crystals was obtained by concentration of the filtrates to Vi volume and cooling to 0°C. The filter cake was dried under N 2 for 18 hours. The crude weighted ER-806629 was charged into a pre-dried reactor and MTBE (3 vol.) was added. The resulting mixture was heated to an internal temperature of 45-50°C for 45 minutes and then slowly cooled to 5°C over 3 hours, with seeding when necessary. n-Heptane (0.5 vol.) was added and the mixture stirred for 18 hours at an internal temperature of 5 °C.
  • Reactor 2 was charged with triethylamine (0.62 wt, 3.55 eq) at a rate such that internal temperature did not exceed 45 °C. After complete addition, an internal temperature of 30 °C was maintained for 1 hour. After 1 hour, reactor 2 was cooled to 0 °C and charged in an inert fashion with NiCl 2 (0.02 wt, 0.1 eq), followed by the contents of reactor 1 and the reaction was warmed to rt. Reactor 2 was cooled to an internal temperature of 0°C and then ethylenediamine (1.2 vol, 10 eq) was added at a rate such that the internal temperature did not exceed 10 °C. Note: An exotherm was observed.
  • the ER-808227 / THF solution from the previous step was analyzed via KF analysis. If KF ⁇ 1000 ppm, then proceeded. If KF > 1000 ppm, azeotroped in vacuo with anhydrous THF (4.1 vol.). Repeated azeotrope until specification was met. The final solution meeting specifications contained the dissolved crude ER-808227 in anhydrous THF (4.1 vol.). Once the specification was met, an appropriately sized inerted reactor was charged with anhydrous THF (106 vol.) and the ER-808227 / THF solution from the previous step.
  • the reactor was cooled to an internal temperature of -15 to -20 °C, then 0.5 M KHMDS in toluene (9.1 wt., 3.0 eq.) was added at a rate such that internal temperature did not exceed - 12 °C. Approximately 4.5 eq. KHMDS was necessary to drive the reaction to completion.
  • the reaction was reverse quenched into semi-saturated ammonium chloride (40 vol.) at an internal temperature of 0 °C.
  • n-Heptane (80 vol.) was added, stirred for 2-5 minutes, and then allowed to partition.
  • the crude ER-806746 was purified via SiO 2 column chromatography to yield ER-804027 (1.16 wt., 0.55 eq.) as a clear yellowish oil.
  • the chromatography was performed as follows: the column was first flushed with sufficient MTBE to remove water then flushed with heptane to remove the MTBE.
  • the ER-806746 was loaded onto the column as a solution in heptane then eluted from the column with heptane/MTBE (5:1) then heptane/MTBE (4:1) with the fractions monitored at 230 nm by UV detector.
  • a reactor was charged with ER-804027 (1 wt, 1 eq) and anhydrous dichloromethane (7.6 vol). The reactor was cooled to an internal temperature of -78 °C and then 1 M DibalH in dichloromethane (3.0 wt, 2.25 eq) was added at a rate such that internal temperature did not exceed -60 °C. Methanol (0.1 vol) was added at a rate such that internal temperature did not exceed -60 °C. Note: hydrogen gas evolved and was diluted with a stream of nitrogen. Upon complete addition, the mixture was warmed to ambient temperature and then 1 N hydrochloric acid (10.6 vol) and MTBE (25 vol) were added.
  • ER-803895 F-3a was dissolved in anhydrous toluene (14 wt.) and cooled to ⁇ -75°C under an argon atmosphere. DIBALH (1.5M in toluene, .0.95 wt., 1.3 eq.) was added at a rate to maintain the internal reaction temperature ⁇ -70 °C. The resulting mixture was stirred for 30 minutes then quenched with anhydrous methanol (0.13 wt., 3.2 eq.), maintaining the internal reaction temperature ⁇ -65 °C.
  • DIBALH 1.5M in toluene, .0.95 wt., 1.3 eq.
  • the reaction mixture was allowed to warm to -10 °C and transferred with an MTBE rinse (3.74 wt.) to a worlcup vessel containing IN HCI (10.2 wt.). The mixture was stirred for 30 minutes and the aqueous layer is drained. The organic phase was washed sequentially with IN HCI (10.2 wt.), water (10 wt.), saturated aqueous sodium bicarbonate (10 wt.), and brine (10 wt.) then concentrated under reduced pressure. The concentrate was purified via silica gel chromatography to afford ER-803896 (0.96 wt., 93%) yield). The product is stored at -20°C under argon.
  • Azeotropically dried aldehyde ER-803896 (1.07wt., 1.23 eq.) was dissolved in anhydrous hexanes (3.53 wt., 5.35 vol.) then cooled to ⁇ -75 °C.
  • the aldehyde solution was added to the ER-804028 anion by canula such that internal temperature ⁇ -65 °C.
  • the mixture was stirred for 45 minutes at internal temperature -78 °C then quenched by the addition of saturated ammonium chloride (5 vol.), methyl tert-butyl ether (10 vol.), and water (5 vol.).
  • the aqueous layer was discarded and the organic layer concentrated under reduced pressure.
  • the crude material was purified via C-l 8 reverse phase chromatography to afford ER-804029 (84%, 1.57 wt.).
  • samarium diiodide solution (2.5 eq.) and the solution cooled to internal temperature ⁇ -70 °C.
  • ER-804030 (1 wt.) wa dissolved in anhydrous methanol (4.1 wt.) and anhydrous THF (2.3 wt.) and then cooled to ⁇ -70°C.
  • ER-804030 was added to the cold samarium solution at a rate such that the internal temperature did not exceed -70°C.
  • the reaction was quenched with potassium carbonate / Rochelle's Salts / water (1/10/100; w/w/v, 15 vol.) and MTBE (5 vol.) such that internal temperature did not exceed -65 °C.
  • the reaction was warmed to room temperature and the mixture transferred to a separatory vessel using the worlcup solution (20 vol. rinse) and MTBE (20 vol. rinse).
  • the aqueous layer was discarded, the organic layer evaporated, and the residue purified via silica gel chromatography to afford ER-118049 (0.77 wt., 85%).
  • the product was stored at -20 °C under inert atmosphere.
  • NiCl 2 (0.09 wt, 1 eq) was added in one portion, followed by the keto-aldehyde ER-118049 in anhydrous THF (2.43 wt, 2.73 vol) over 30 minutes. The heat was removed then heptane (20.5 wt, 30 vol) and Celite ® (1.5 wt) were added. The mixture was stirred for 5 minutes and filtered over a pad of Celite ® (15 wt) and the Celite ® pad rinsed with heptane (7.3 vol) and acetonitrile (5 vol). The filtrate was transferred to a separatory funnel and the lower layer removed.
  • the crude material was purified by flash chromatography (prepped with 3 CV (1:1 (V/V) DCM/heptane, the material was loaded with 1:1 DCM/heptane then eluted with 10/10/1 heptane/DCM/MTBE).
  • the product- containing fractions were concentrated and stored under inert atmosphere at -20 °C.
  • ER-118047/48 the oxidation of ER-118047/48 to form the di-ketone ER-118046 was accomplished as follows. A flask was charged with ER-118047/48 (1 wt, 1.0 eq) and toluene (10 vol) and DMSO (0.15 wts, 2.5 eq) were added at room temperature. Et N (0.31 wts, 4.0 eq) was added and the solution was cooled to -15 °C. TCAA (0.33 wts, 1.4 eq) was added neat and the reaction warmed to 0 °C. then stirred for 10 minutes at 0 °C. The reaction was stirred for additional 10 minutes then was quenched with IPA (0.15 vol).
  • a DCM solution of Ts 2 O was added drop-wise keeping the internal temperature below -16 °C (1.02 eq).
  • the reaction was stirred at -20 to -25 °C for 80 minutes then warmed to 0 °C over 20 minutes and stirred for an additional 20 minutes.
  • the reaction was quenched with water (2 vol). The bath was removed, and the reaction allowed to warm to room temperature (15-20 °C) and stirred (20 minutes).
  • the reaction was rinsed to a larger vessel using the IPA (100 vol) and aqueous ammonium hydroxide (100 vol) was added to the reaction.
  • the reaction was stirred at room temperature for 15-36 hours, monitoring for the disappearance of the tosylate (ER-082892) and epoxide (ER-809681) which formed in situ.
  • the reaction was concentrated to dryness or near dryness at reduced pressure.
  • the resulting material was diluted with DCM (25-40 vol) and washed pH 10 buffer (NaHCO 3 /Na 2 CO 3 (aq), 10 vol).
  • the aqueous phase was back extracted with 25 vol of DCM and the combined organic layers were concentrated to dryness.
  • the resulting free amine was purified by silica gel cliromatography using a buffered ACN/water mobile phase. The pooled fractions were concentrated at reduced pressure to remove ACN.
  • the resulting aqueous layer was diluted with DCM (40 vol) and with 30 vol of a pH 10 buffered stock solution (NaHCO 3 /Na 2 CO 3 ). The layers were mixed well and separated. The aqueous phase was back extracted with 25 vol of DCM and the combined organic layers were concentrated to dryness. The resulting free amine was polish filtered as a solution in 3:1 DCM/pentane and concentrated to dryness (0.80 wts) to afford B-1939.

Abstract

The present invention provides macrocyclic compounds, synthesis of the same and intermediates thereto. Such compounds, and compositions thereof, are useful for treating or preventing proliferative disorders Formula (F-4).

Description

INTERMEDIATES FOR THE PREPARATION OF HALICHONDRIN B
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to United States Provisional Patent Applications 60/576,642, filed June 3, 2004, 60/626,769, filed November 10, 2004, and 60/663,300 filed March 18, 2005, the entire contents of each of which are hereby incorporated herein by reference.
TECHNICAL FIELD OF INVENTION
[0002] The present invention relates to compounds useful as intermediates in the synthesis of pharmaceutically active macrolide compounds.
BACKGROUND OF THE INVENTION [0003] The invention relates to pharmaceutically active macrolides, synthesis thereof and intermediates thereto. Halichondrin B is a potent anticancer agent originally isolated from the marine sponge Halichondria okadai, and subsequently found in Axinella sp., Phakellia carteri, and Lissondendryx sp. A total synthesis of Halichondrin B was published in 1992 (Aicher, T. D. et al, J. Am. Chem. Soc. 114:3162-3164). Halichondrin B has demonstrated in vitro inhibition of tubulin polymerization, microtubule assembly, betas-tubulin crosslinking, GTP and vinblastine binding to tubulin, and tubulin-dependent GTP hydrolysis and has shown in vitro and in vivo anti-cancer properties. Accordingly, there is a need to develop synthetic methods for preparing analogs of Halichondrin B useful as anti-cancer agents.
SUMMARY OF THE INVENTION [0004] As described herein, the present invention provides methods for preparing analogs of Halichondrin B having pharmaceutical activity, such as anticancer or antimitotic (mitosis- blocking) activity. These compounds include a compound of formula B-1939:
Figure imgf000003_0001
B-1939.
[0005] These compounds are useful for treating cancer and other proliferative disorders including, but not limited to, melanoma, fibrosarcoma, leukemia, colon carcinoma, ovaiian carcinoma, breast carcinoma, osteosarcoma, prostate carcinoma, lung carcinoma, and ras- transformed fibroblasts. The present invention also provides synthetic intermediates useful for preparing said analogs of Halichondrin B.
DETAILED DESCRIPTION OF CERTAIN EMBODIMENTS OF THE INVENTION [0006] The methods and intermediates of the present inventin are useful for preparing various analogs of Halichondrin B as described in, e.g. United States Patent 6,365,759 and United States Patent 6,469,182 the entirety of which are incorporated herein by reference. These Halichondrin B analogs are prepared generally by the assembly of three fragments F-1, F-2, and F-3, as shown by Scheme I below:
Figure imgf000003_0002
1. Fragment F-1
[0007] According to one embodiment, the present invention provides a compound F-1 :
Figure imgf000004_0001
F-1 wherein:
1 each of PG and PG is independently hydrogen or a suitable hydroxyl protecting group;
R1 is R or OR;
R2 is CHO or -CH=CH2; and each R is independently hydrogen, C1- haloaliphatic, benzyl, or C1- aliphatic, provided that
1 1 9 when R is OMe then PG and PG do not form an acetonide group. [0008] In certain embodiments, R1 is OR. In other embodiments, R1 is OR wherein R is hydrogen, methyl, or benzyl. [0009] In certain embodiments, PG1 and PG2 are hydrogen. In other embodiments, one of
1 9
PG and PG is hydrogen.
[0010] Suitable hydroxyl protecting groups are well known in the art and include those described in detail in Protecting Groups in Organic Synthesis, T. W. Greene and P. G. M. Wuts, 3rd edition, John Wiley & Sons, 1999, the entirety of which is incorporated herein by
1 9 reference. In certain embodiments, each of PG and PG , taken with the oxygen atom to which it is bound, is independently selected from esters, ethers, silyl ethers, alkyl ethers, arylalkyl ethers, and alkoxyalkyl ethers. Examples of such esters include formates, acetates, carbonates, and sulfonates. Specific examples include formate, benzoyl formate, chloroacetate, trifluoroacetate, methoxyacetate, triphenylmethoxyacetate, p- chlorophenoxyacetate, 3-phenylpropionate, 4-oxopentanoate, 4,4-(ethylenedithio)pentanoate, pivaloate (trimethylacetyl), crotonate, 4-methoxy-crotonate, benzoate, p-benylbenzoate, 2,4,6-trimethylbenzoate, or carbonates such as methyl, 9-fluorenylmethyl, ethyl, 2,2,2- trichloroethyl, 2-(trimethylsilyl)ethyl, 2-(phenylsulfonyl)ethyl, vinyl, allyl, and p-nitrobenzyl. Examples of such silyl ethers include trimethylsilyl, triethylsilyl, t-butyldimethylsilyl, t- butyldiphenylsilyl, triisopropylsilyl, and other trialkylsilyl ethers. Alkyl ethers include methyl, benzyl, p-methoxybenzyl, 3,4-dimethoxybenzyl, trityl, t-butyl, allyl, and allyloxycarbonyl ethers or derivatives. Alkoxyalkyl ethers include acetals such as methoxymethyl, methylthiomethyl, (2-methoxyethoxy)methyl, benzyloxymethyl, beta-
(trimethylsilyl)ethoxymethyl, and tetrahydropyranyl ethers. Examples of arylalkyl ethers include benzyl, p-methoxybenzyl (MPM), 3,4-dimethoxybenzyl, O-nitrobenzyl, p- nitrobenzyl, p-halobenzyl, 2,6-dichlorobenzyl, p-cyanobenzyl, 2- and 4-picolyl.
[0011] In certain embodiments, one or both of the PG1 and PG2 moieties of F-1 are silyl ethers or arylalkyl ethers. In yet other embodiments, one or both of the PG1 and PG2 moieties of F-1 are t-butyldimethylsilyl or benzoyl. In still other embodiments, both of the PG1 and
PG2 moieties of F-1 are t-butyldimethylsilyl.
[0012] According to an alternate embodiment, PG and PG are taken together, with the oxygen atoms to which they are bound, to form a diol protecting group, such as a cyclic acetal or ketal. Such groups include methylene, ethylidene, benzylidene, isopropylidene, cyclohexylidene, and cyclopentylidene, a silylene derivative such as di-t-butylsilylene and a
1,1,3,3-tetraisopropylidisiloxanylidene derivative, a cyclic carbonate, and a cyclic boronate.
Methods of adding and removing such hydroxyl protecting groups, and additional protecting groups, are well-known in the art and available, for example, in P. J. Kociensld, Protecting
Groups, Thieme, 1994, and in T. W. Greene and P. G. M. Wuts, Protective Groups in
Organic Synthesis, 3rd edition, John Wiley & Sons, 1999. According to another embodiment,
PG and PG are taken together to form an acetonide group.
[0013] According to one embodiment, R is CHO.
[0014] According to another embodiment, R is -CH=CH2.
[0015] In certain embodiments, the present invention provides a compound of formula F-1 having the stereochemistry depicted in compound F-1':
Figure imgf000005_0001
F-1' wherein each variable is as defined above and described in classes and subclasses above and herein.
[0016] In certain embodiments, the following compounds F-la and F-lb are provided:
Figure imgf000006_0001
F-la F-lb wherein "TBS" refers to t-butyldimethylsilyl.
[0017] Details of the syntheses of F-la and F-lb are set forth in the Examples infra.
2. Fragment F-2
[0018] According to another embodiment, the present invention provides a compound
F-2:
Figure imgf000006_0002
F-2 wherein: each =^ is independently a single or double bond, provided that both = groups are not simultaneously a double bond; LG1 is a suitable leaving group; X is halogen or -OSO2(Ry); Ry is Cι-6 aliphatic or a 5-7 membered saturated, partially unsaturated, or fully unsaturated ring, wherein Ry is optionally substituted with up to 3 groups selected from halogen, R,
NO2, CN, OR, SR, or N(R)2; each R is independently hydrogen, C1- haloaliphatic, or C1-4 aliphatic; and PG is a suitable hydroxyl protecting group.
[0019] As used herein, a suitable leaving group is a chemical moiety that is readily displaced by a desired incoming chemical moiety. Suitable leaving groups are well lαiown in the art, e.g., see, "Advanced Organic Chemistry," Jerry March, 4th Ed., pp. 351-357, John Wiley and Sons, N.Y. (1992). Such leaving groups include, but are not limited to, halogen, alkoxy, sulphonyloxy, optionally substituted alkylsulphonyloxy, optionally substituted alkenylsulfonyloxy, optionally substituted arylsulfonyloxy, and diazonium moieties. Examples of suitable leaving groups include chloro, iodo, bromo, fluoro, methanesulfonyl (mesyl), tosyl, triflate, nitro-phenylsulfonyl (nosyl), and bromo-phenylsulfonyl (brosyl). In certain embodiments, the LG1 moiety of F-2 is sulphonyloxy, optionally substituted alkylsulphonyloxy, optionally substituted alkenylsulfonyloxy, or optionally substituted arylsulfonyloxy. In other embodiments, the LG1 moiety of F-2 is optionally substituted alkylsulphonyloxy. In yet other embodiments, the LG1 moiety of F-2 is mesyl or tosyl. [0020] In certain embodiments, the X moiety of F-2 is halogen. In other embodiments, the X moiety of F-2 is sulphonyloxy, optionally substituted alkylsulphonyl, optionally substituted alkenylsulfonyl, or optionally substituted arylsulfonyl. In still other embodiments, the X moiety of F-2 is triflate.
[0021] In certain embodiments, the PG3 moiety of F-2, taken with the oxygen atom to which it is bound, is a silyl ether. In other embodiments, the PG moiety of F-2, taken with the oxygen atom to which it is bound, is an ester group. According to one aspect of the present invention, the PG moiety of F-2-, taken with the oxygen atom to which it is bound, is t-butyldimethylsilyl. According to another aspect of the present invention, the PG3 moiety of F-2, taken with the oxygen atom to which it is bound, is pivaloyl or benzoyl. [0022] In certain embodiments, the present invention provides a compound of formula F-2 having the stereochemistry depicted in formula F-2':
Figure imgf000007_0001
F-2' wherein each variable is as defined above and described in classes and subclasses above and herein.
[0023] In certain embodiments, a compound F-2a or F-2b is provided:
Figure imgf000007_0002
F-2a F-2b wherein "MsO" refers to mesylate, "TfO" refers to triflate, "OPv" refers to pivaloate, "OBz" refers to benzoate, and "TsO" refers to tosylate.
[0024] In other embodiments, the present invention provides a compound of formula F-2b wherein said compound is crystalline. According to another embodiment, a compound of formula F-2b is provided wherein said compound is crystallized from an alkane solvent. In certain embodiments, crystalline F-2b is provided wherein said compound is crystallized from pentane or heptane. In other embodiments, crystalline F-2b is provided wherein said compound is crystallized at about 0 °C.
[0025] Compounds of formula F-2 are prepared generally from intermediates F-2d and
F-2e as shown in Scheme A below.
Scheme A
Figure imgf000008_0001
[0026] Accordingly, another aspect of the present invention provides a compound of formula F-2d:
Figure imgf000008_0002
F-2d wherein:
R' is -CH=CH2 or -C(O)H;
Alk is a C1-4 straight or branched aliphatic group; and
PG5 is a suitable hydroxyl protecting group.
[0027] Suitable hydroxyl protecting group PG5 is as described and defined for the PG3 moiety of compound F-2, supra. In certain embodiments, PG5, taken with the oxygen atom to which it is bound, is a silyl ether. In other embodiments, PG5 is t-butyldimethylsilyl.
[0028] According to one embodiment, the Alk moiety of compound F-2d is methyl. [0029] In certain embodiments, a compound of formula F-2d' is provided:
Figure imgf000009_0001
F-2d'
[0030] Yet another aspect of the present invention provides a compound of formula F-2e:
Figure imgf000009_0002
F-2e wherein:
R" is OH, OPG3, or LG4;
LG4 is a suitable leaving group; and each PG3 is independently a suitable hydroxyl protecting group, provided that R" is other than OMs when PG3 is t-butyldiphenylsilyl. [0031] One of ordinary skill in the art would recognize that the R" moiety of compound F- 2e may be transformed from OH to a protected hydroxyl group, OPG3, or, alternatively, directly to LG4. Such transformations are lαiown to one skilled in the art and include, among others, those described herein. In certain embodiments, R" is OH or LG4. The LG4 leaving group of formula F-2e is as described and defined for the LG1 moiety of compound F-2, supra. In certain embodiments, LG4 is tosyl or mesyl.
[0032] The PG moiety of compound F-2e is as defined and described for the PG moiety of compound F-2, supra. In certain embodiments, PG , taken with the oxygen atom to which it is bound, is a silyl ether. In other embodiments, PG3 is t-butyldiphenylsilyl. [0033] Still another aspect of the present invention provides a compound F-2f:
Figure imgf000009_0003
F-2f wherein Alk, PG and PG are as defined generally and in classes and subclasses described above and herein. Compounds of formula F-2f are used to prepare compounds of formula F-2 by methods described herein and those known in the art. [0034] Details of the synthesis of F-2a are set forth in the Examples infra. [0035] Alternatively, compounds of formula F-2 are prepared from D-quinic acid as shown by Scheme II below. Details of the preparation of compounds of formula F-2 are set forth in the Examples infi-a.
Scheme II
Figure imgf000011_0001
from 6a
Figure imgf000011_0002
Figure imgf000011_0003
Figure imgf000011_0004
24 25, X=0,Y=Me, R=TBS, R'=Tr
22, R=H
23, R=Me 26, X=CH2, Y=OTf, R=TBS, R'=Tr
27, X=CH2, Y=OTf, R=R'=H
[0036] Yet another method for preparing compounds of formula F-2 from D-quinic acid provides an alternative route from intermediate 12 to intermediate 17 as shown in Scheme III below. Scheme III
Figure imgf000012_0001
or BuLi
Figure imgf000012_0002
Figure imgf000012_0003
Figure imgf000012_0004
17 [0037] Scheme III above shows an alternate method for preparing intermediate 17 from intermediate 12 via Eschenmoser-Tanabe Fragmentation, wherein each Rx is independently OPGx or CN wherein PGX is a suitable hydroxyl protecting group as described herein. Intermediate 17 is then used to prepare compounds of formula F-2 according to Scheme II above.
[0038] Still another method for preparing compounds of formula F-2 from D-quinic acid provides an alternative route from intermediate 9 to intermediate 17 as shown in Scheme IV below. Scheme IV
Deprotection
Figure imgf000013_0001
Figure imgf000013_0002
oxidation
Figure imgf000013_0004
Figure imgf000013_0003
reduction
Figure imgf000013_0005
Figure imgf000013_0006
Hydroxyl protection BuLi
Figure imgf000013_0007
Figure imgf000013_0008
Figure imgf000013_0009
17 wherein PGy is a suitable carboxyl protecting group, as described herein, and each PGX is independently a suitable hydroxyl protecting group as described herein. [0039] Yet another method for preparing intermediates useful for preparing compounds of formula F-2 from D-quinic acid is shown in Scheme V below.
Scheme V
Figure imgf000014_0001
A-3 A-4
1. Deprotection
2. recryslalliz-Tlion
Figure imgf000014_0002
[0040] In Scheme V above, intermediate 7 (from Scheme II), wherein R is a methyl ester, is used to prepare ER-817664 as a crystalline intermediate. As depicted in Scheme V above, each PG5 and PG6 is independently a suitable hydroxyl protecting group. In certain embodiments, PG5 and PG6 are taken together to form a cyclic diol protecting group. In other embodiments, PG5 and PG6 are taken together to form a cyclohexylidene protecting group. As depicted in Scheme V above, LG5 is a suitable leaving group. Such suitable leaving groups are well known in the art and include those described herein. In certain embodiments, LG5 is mesyl or tosyl.
[0041] According to another embodiment, the present invention provides a compound of formula A:
Figure imgf000014_0003
wherein:
== designates a single or double bond; n is 1, 2, or 3; each of PG5 and PG6 is independently a suitable hydroxyl protecting group;
W is CH-A or C(O); A is oxo or a C1-6 aliphatic group, wherein A is optionally substituted with one or more Q1 groups; each Q1 is independently selected from cyano, halo, azido, oxo, OR, SR, SO2R, OSO R, N(R)2, NR(CO)R, NR(CO)(CO)R, NR(CO)N(R)2, NR(CO)OR, (CO)OR, O(CO)R, (CO)N(R)2, O(CO)N(R)2, or OPG1, wherein PG1 is a suitable hydroxyl protecting group, and wherein: two Q1 on A are optionally taken together to form a 3-8 membered saturated, partially unsaturated, or aryl ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur; and each R is independently selected from hydrogen or an optionally substituted group selected from Cι-6 aliphatic, a 5-10 membered saturated, partially unsaturated or aryl carbocyclic ring, or a 4-10 membered saturated, partially unsaturated or aryl ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein: two R groups on the same nitrogen atom are optionally taken together with said nitrogen atom to form a 3-8 membered saturated, partially unsaturated, or aryl ring having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur. [0042] In certain embodiments, the present invention provides a compound of formula A having the stereochemistry as depicted in formula A' :
Figure imgf000015_0001
A' wherein each variable is as defined above and described in classes and subclasses above and herein.
[0043] In certain embodiments, the present invention provides a compound of formula A' wherein A is C(O) and said compound is of formula A'-l:
Figure imgf000015_0002
A'-l wherein each variable is as defined above and described in classes and subclasses above and herein.
[0044] As defined generally above, the A group of formulae A and A' is a C1-6 aliphatic group, wherein A is optionally substituted with Q1. In certain embodiments, the A group of formulae A and A' is a C2- aliphatic group, wherein A is substituted with one or more Q1 groups.
[0045] As defined generally above, each Q group of formulae A and A' is independently selected from cyano, halo, azido, oxo, OR, SR, SO2R, OSO2R, N(R)2, NR(CO)R,
NR(CO)(CO)R, NR(CO)N(R)2, NR(CO)OR, (CO)OR, O(CO)R, (CO)N(R)2, O(CO)N(R)2, or OPG1, wherein PG1 is a suitable hydroxyl protecting group. In certain embodiments, each
Q1 group of formulae A and A' is independently selected from cyano, halo, azido, oxo,
N(R)2, OR, SR, SO2R, or OSO2R. In other embodiments, each Q1 group of formulae A and
A' is independently selected from cyano, halo, azido, oxo, OR, SR, SO2R, OSO2R, N(R)2,
NR(CO)R, NR(CO)R, and O(CO)N(R)2. In still other embodiments, exemplary Q1 groups include NH(CO)(CO)-(heterocyclic radical or heteroaryl), OSO2-(aryl or substituted aryl),
O(CO)NH-(aryl or substituted aryl), aminoalkyl, hydroxyalkyl, NH(CO)(CO)-(aryl or substituted aryl), NH(CO)(alkyl)(heteroaryl or heterocyclic radical), O(substituted or unsubstituted alkyl)(substituted or unsubstituted aryl), and NH(CO)(alkyl)(aryl or substituted aryl).
[0046] In certain embodiments, the A group of formulae A and A' has one of the following characteristics:
(1) A has at least one substituent selected from hydroxyl, amino, azido, halo, and oxo;
(2) A is a C1-6 alkyl group having at least one substituent selected from hydroxyl, amino, and azido;
(3) A has at least two substituents independently selected from hydroxyl, amino, and azido;
(4) A has at least two substituents independently selected from hydroxyl and amino;
(5) A has at least one hydroxyl substituent and at least one amino substituent;
(6) A has at least two hydroxyl substituents;
(7) A is a C2- aliphatic group that is substituted;
(8) A is a C3 aliphatic group that is substituted; (9) A has an (S)-hydroxyl alpha to the carbon atom linking A to the ring containing G or an (R)-hydroxyl; and
(10) A is a C1-6 saturated aliphatic group having at least one substituent selected from hydroxyl and cyano.
[0047] The term "(S)-hydroxyl" means that the configuration of the carbon atom having the hydroxyl group is (S). Embodiments of the invention also include compounds wherein A is substituted at least once on each carbon atom: (1) alpha and gamma, (2) beta and gamma, or (3) alpha and beta to the carbon atom to which A is attached. Each of the alpha, beta, and gamma carbon atoms are independently in the (R) or (S) configuration. In certain embodiments, the invention provides said compound wherein A is substituted at least once on each carbon atom alpha and beta to the carbon atom to which A is attached. [0048] Exemplary A groups of formulae A and A' include 2,3-dihydroxypropyl, 2- hydroxyethyl, 3-hydroxy-4-perfluorobutyl, 2,4,5-trihydroxypentyl, 3-amino-2- hydroxypropyl, 1,2-dihydroxyethyl, 2,3-dihyroxy-4-perflurobutyl, 3-cyano-2-hydroxypropyl, 2-amino-l-hydroxy ethyl, 3 -azido-2 -hydroxypropyl, 3,3-difluoro-2,4-dihydroxybutyl, 2,4- dihydroxybutyl, 2-hydroxy-2-(p-fluorophenyl)-ethyl, -CH2(CO)(substituted or unsubstituted aryl), -CH2(CO)(alkyl or substituted alkyl, such as haloalkyl or hydroxyalkyl) and 3,3- difluoro-2-hydroxypent-4-enyl.
[0049] In certain embodiments, the A group of either of formulae A and A' is 3-amino-2- hydroxypropyl.
[0050] According to one aspect, the present invention provides a compound of either of formulae A and A', wherein Q1 is OPG , wherein PG is a suitable hydroxyl protecting group. Suitable hydroxyl protecting groups are well known in the art and include those described in detail in Protecting Groups in Organic Synthesis, T. W. Greene and P. G. M. Wuts, 3 edition, John Wiley & Sons, 1999, the entirety of which is incorporated herein by reference. In certain embodiments, the PG1 moiety of either of formulae A and A', taken with the oxygen atom to which it is bound, is selected from esters, ethers, silyl ethers, alkyl ethers, arylalkyl ethers, and alkoxyalkyl ethers. Examples of such esters include formates, acetates, carbonates, and sulfonates. Specific examples include formate, benzoyl formate, chloroacetate, trifluoroacetate, methoxyacetate, triphenylmethoxyacetate, p- chlorophenoxyacetate, 3-phenylpropionate, 4-oxopentanoate, 4,4-(ethylenedithio)pentanoate, pivaloate (trimethylacetyl), crotonate, 4-methoxy-crotonate, benzoate, p-benylbenzoate, 2,4,6-trimethylbenzoate, carbonates such as methyl, 9-fluorenylmethyl, ethyl, 2,2,2- trichloroethyl, 2-(trimethylsilyl)ethyl, 2-(phenylsulfonyl)ethyl, vinyl, allyl, and p-nitrobenzyl. Examples of such silyl ethers include trimethylsilyl, triethylsilyl, t-butyldimethylsilyl, t- butyldiphenylsilyl, triisopropylsilyl, and other trialkylsilyl ethers. Alkyl ethers include methyl, benzyl, p-methoxybenzyl, 3,4-dimethoxybenzyl, trityl, t-butyl, allyl, and allyloxycarbonyl ethers or derivatives. Alkoxyalkyl ethers include acetals such as methoxymethyl, methylthiomethyl, (2-methoxyethoxy)methyl, benzyloxymethyl, beta- (trimethylsilyl)ethoxymethyl, and tetrahydropyranyl ethers. Examples of arylalkyl ethers include benzyl, p-methoxybenzyl (MPM), 3,4-dimethoxybenzyl, O-nitrobenzyl, p- nitrobenzyl, p-halobenzyl, 2,6-dichlorobenzyl, p-cyanobenzyl, 2- and 4-picolyl. [0051] In certain embodiments, the PG1 moiety of either of formulae A and A' , taken with the oxygen atom to which it is bound, is a silyl ether or arylalkyl ether. In yet other embodiments, the PG1 moiety of either of formulae A and A' is t-butyldimethylsilyl or benzoyl. In still other embodiments, the PG1 moiety of either of formulae A and A' is t- butyldimethylsilyl ("TBS").
[0052] As defined generally above, two Q1 on A are optionally taken together to form a 3- 8 membered saturated, partially unsaturated, or aryl ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur. In certain embodiments, two Q on A are taken together to form an epoxide ring.
[0053] In certain embodiments, the PG5 and PG6 groups of formula A and A' are independently selected from those suitable protecting groups described above for the PG group of formula A and A'. In other embodiments, the PG5 and PG6 groups of formula A and A' are taken together to form a cyclic diol protecting group. Such diol protecting groups are well known in the art and include those described by Greene and include cyclohexyhdene and benzylidene diol protecting groups.
[0054] In certain embodiments, the present invention provides a method for preparing compounds of formula F-2 according to Schemes V-a, V-b, and V-c below: Scheme V-a
Figure imgf000019_0001
D-quinic acid ER-108423 ER-812929
DIBALH
Tolune
Figure imgf000019_0002
Figure imgf000019_0003
[0055] In other embodiments, the present invention provides crystalline ER-817664.
Scheme V-b
Figure imgf000020_0001
Figure imgf000020_0002
ER-818643 ER-818644
TBDPSCI
Figure imgf000020_0003
ER-813012 Scheme V-c
Figure imgf000021_0001
ER-813012 ER-817704
MeMgCI
Figure imgf000021_0002
ER-806728 TBDPS
Figure imgf000021_0003
ER-806727 ER-806729
Figure imgf000021_0004
ER-806730
[0056] Using ER-817664 as a crystalline intermediate, Scheme Vl-a shows a general method for using this compound in the preparation of inteπnediates useful for preparing compounds of formula F-2.
Scheme Vl-a DBU
Figure imgf000022_0001
Figure imgf000022_0002
[0057] The triol intermediate depicted in Scheme Vl-a above is used in an alternate method for preparing inteπnediates useful for preparing compounds of formula F-2, as shown in Scheme Vl-b below.
Scheme Vl-b
Figure imgf000023_0001
[0058] In Scheme Vl-b, shown above, the triol intermediate is treated with periodate to form the aldehyde. This compound is homologated with methyl Wittig reagent, and the resulting olefin reduced, to form the ester compound. The remaining free hydroxyl group is treated with N-iodosuccinimide to form the iodo intermediate and the ester reduced with sodium borohydride to form the hydroxyl compound depicted above. One of ordinary skill in the art will recognize that the resulting iodo compound corresponds to compound 21 depicted in Scheme II, supra, wherein compound 21 has a protecting group at the hydroxyl position. The final treatment with zinc affords the lactone depicted above. One of ordinary skill in the art will recognize that the resulting lactone compound corresponds to compound 22 depicted in Scheme II, supra, wherein compound 22 has a protecting group at the hydroxyl position. [0059] Yet another alternate method for preparing intermediates useful for preparing compounds of formula F-2 from D-quinic acid provides an alternative route from intermediate 2, of Scheme II as shown in Scheme VII below. Scheme VII
Figure imgf000024_0001
[0060] In Scheme VII above, intermediate 2 (from Scheme II) is used to prepare ER- 812829 in a stereoselective manner. It will be appreciated that other protecting groups are useful for protecting the diol of ER-812829. Such groups are lαiown to one of ordinary skill in the art and include cyclohexyhdene and benzylidene diol protecting groups. First, at step (a), the hydroxyl group of ER-811510 is treated with 2-bromo chloroacetic acid to form ER- 812771. The bromo intermediate is treated with triphenylphosphine to form a Wittig reagent in situ in a manner substantially similar to that described by Murphy, et al, Tetrahedron Letters, 40, (1999) 3455-3456. This Wittig reagent then forms the lactone ER-812772. At step (d), stereoselective hydrogenation of the double bond affords ER-812829. [0061] The present invention also provides a method for preparing intermediates useful for preparing compounds of formula F-2 from D-quinic acid, from intermediate ER-812829 depicted in Scheme VII above, as shown in Scheme Vll-a below.
Scheme Vll-a
Figure imgf000025_0001
Dess-Martin periodane
Figure imgf000025_0002
ER-806730
3. Fragment F-3
[0062] According to yet another embodiment, the present invention provides a compound
F-3:
Figure imgf000025_0003
wherein: each PG is an independently selected suitable hydroxyl protecting group;
R3 is CHO or C(O)OR4;
R4 is a suitable carboxyl protecting group; and
LG2 is a suitable leaving group. [0063] Suitable carboxylate protecting groups are well known in the art and are described in detail in Protecting Groups in Organic Synthesis, T. W. Greene and P. G. M. Wuts, 3rd edition, John Wiley & Sons, 1999. In certain embodiments, the R4 group of F-3 is an optionally substituted C1-6 aliphatic group or an optionally substituted aryl group. Examples of suitable R4 groups include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, benzyl, and phenyl wherein each group is optionally substituted.
[0064] As described above, suitable leaving groups are well known in the art, e.g., see "Advanced Organic Chemistry," Jerry March, 4th Ed., pp. 351-357, John Wiley and Sons, N.Y. (1992). Such leaving groups include, but are not limited to, halogen, alkoxy, sulphonyloxy, optionally substituted alkylsulphonyloxy, optionally substituted alkenylsulfonyloxy, optionally substituted arylsulfonyloxy, silyl, and diazonium moieties. Examples of suitable leaving groups include chloro, iodo, bromo, fluoro, methanesulfonyl (mesyl), tosyl, triflate, nitro-phenylsulfonyl (nosyl), and bromo-phenylsulfonyl (brosyl). In certain embodiments, the LG2 moiety of F-3 is iodo.
[0065] According to an alternate embodiment, the suitable leaving group may be generated in situ within the reaction medium. For example, LG2 in a compound of formula F-3 may be generated in situ from a precursor of that compound of formula F-3 wherein said precursor contains a group readily replaced by LG2 in situ. In a specific illustration of such a replacement, said precursor of a compound of formula F-3 contains a group (for example, a trimethylsilyl group) which is replaced in situ by LG2, such as an iodo group. The source of the iodo group may be, e.g., N-iodosuccinimide. Such an in situ generation of a suitable leaving group is well known in the art, e.g., see Id.
[0066] As described above, suitable hydroxyl protecting groups are well lαiown in the art and include those described in detail in Protecting Groups in Organic Synthesis, T. W. Greene and P. G. M. Wuts, 3rd edition, John Wiley & Sons, 1999 the entirety of which is incorporated herein by reference. In certain embodiments, each PG4, taken with the oxygen atom to which it is bound, is independently selected from esters, ethers, silyl ethers, alkyl ethers, arylalkyl ethers, and alkoxyalkyl ethers. Examples of such esters include formates, acetates, carbonates, and sulfonates. Specific examples include formate, benzoyl formate, chloroacetate, trifluoroacetate, methoxyacetate, triphenylmethoxyacetate, p- chlorophenoxyacetate, 3-phenylpropionate, 4-oxopentanoate, 4,4-(ethylenedithio)pentanoate, pivaloate (trimethylacetyl), crotonate, 4-methoxy-crotonate, benzoate, p-benylbenzoate, 2,4,6-trimethylbenzoate, carbonates such as methyl, 9-fluorenylmethyl, ethyl, 2,2,2- trichloroethyl, 2-(trimethylsilyl)ethyl, 2-(phenylsulfonyl)ethyl, vinyl, allyl, and p-nitrobenzyl. Examples of such silyl ethers include trimethylsilyl, triethylsilyl, t-butyldimethylsilyl, t- butyldiphenylsilyl, triisopropylsilyl, and other trialkylsilyl ethers. Alkyl ethers include methyl, benzyl, p-methoxybenzyl, 3,4-dimethoxybenzyl, trityl, t-butyl, allyl, and allyloxycarbonyl ethers or derivatives. Alkoxyalkyl ethers include acetals such as methoxymethyl, methylthiomethyl, (2-methoxyethoxy)methyl, benzyloxymethyl, beta- (trimethylsilyl)ethoxymethyl, and tetrahydropyranyl ethers. Examples of arylalkyl ethers include benzyl, p-methoxybenzyl (MPM), 3,4-dimethoxybenzyl, o-nitrobenzyl, p- nitrobenzyl, p-halobenzyl, 2,6-dichlorobenzyl, p-cyanobenzyl, 2- and 4-picolyl. [0067] In certain embodiments, one, two, or three of the PG4 moieties of F-3, taken with the oxygen atom(s) to which they are bound, are silyl ethers or arylalkyl ethers. In yet other embodiments, one, two, or three of the PG4 moieties of F-3 are t-butyldimethylsilyl or benzyl. In still other embodiments, all three of the PG4 moieties of F-3 are t- butyldimethylsilyl.
[0068] According to another embodiment, a compound of formula F-3 is provided wherein said compound has the stereochemistry as depicted in formula F-3':
Figure imgf000027_0001
F-3' wherein each variable is as defined above and described in classes and subclasses above and herein.
[0069] In certain embodiments, a compound F-3a is provided:
Figure imgf000027_0002
F-3a wherein "TBS" refers to t-butyldimethylsilyl.
[0070] Details of the synthesis of F-3a are set forth in the Examples infra. 4. Assembly of F-1, F-2, and F-3 to Prepare Compound I
[0071] Coupling of the fragments F-1- and F-2 is accomplished, in general, as set forth in
Scheme VIII below.
Scheme VIII
Figure imgf000028_0001
F-5a F-5
[0072] Scheme VIII above shows a general method for preparing intermediate F-5a from fragments F-1 and F-2. First, fragments F-1- and F-2- are coupled using methods substantially similar to that described by Kishi, et al., Org Lett 4:25 p 4431 (2002) to afford intermediate F-4. This coupling is performed in the presence of the chiral oxazole (ER- 807363) or, alternatively, in the absence of ER-807363. However, the coupling reaction of F-1 and F-2 proceeds with higher selectivity when performed in the presence of ER-807363. Intramolecular Williamson ether formation of F-4, by treating F-4 with potassium hexamethyldisilazide, then furnishes tetrahydropyran F-5 as a mixture of stereoisomers. The stereoisomers are then separated to afford F-5a. The details of these steps are set forth in the Examples infra.
11 [0073] According to another embodiment, the present invention provides a compound F-4:
Figure imgf000029_0001
F-4 wherein PG1, PG2, PG3, LG1, and R1 are as defined in general and in subclasses above and herein.
[0074] In certain embodiments, the present invention provides a compound of formula F-4 wherein said compound has the stereochemistry depicted in formula F-4':
Figure imgf000029_0002
F-4' wherein PG1, PG2, PG3, LG1, and R1 are as defined in general and in subclasses above and herein.
[0075] The present invention also provides a compound F-4a:
Figure imgf000030_0001
F-4a wherein "MsO" refers to mesylate, "TBS" refers to t-butyldimethylsilyl, and "OPv" refers to pivaloate.
[0076] Details of the synthesis of F-4a are set forth in the Examples infra.
[0077] According to yet another embodiment, the present invention provides a compound
F-5:
Figure imgf000030_0002
F-5 wherein each PG1, PG2, PG3, and R1 is as defined in general and in subclasses above and herein.
[0078] In certain embodiments, the present invention provides a compound of formula F-5 having the stereochemistry as depicted in formula F-5' or F-5a:
Figure imgf000030_0003
F-5' F-5a wherein each PG1, PG2, PG3, and R1 is as defined in general and in subclasses above and herein.
[0079] The PG3 group of intermediate F-5a is removed and the resulting hydroxyl compound F-6 is then coupled with a compound F-3 a, wherein R is CHO, to form F-7 as depicted in Scheme IX below.
Scheme IX
Figure imgf000031_0001
[0080] Scheme IX above shows a general method for preparing an intermediate F-9 from F-3a and F-6. First, the sulfone intermediate F-6 is treated with «-butyl lithium then with the aldehyde F-3a. The resulting diol intermediate F-7 is then oxidized with Dess-Martin reagent to form the ketone-aldehyde intermediate F-8 which is then treated with Sml2 to afford intermediate F-9. The details of these steps are set forth in the Examples infra. Scheme X
Figure imgf000032_0001
[0081] Scheme X above sets forth a general method for preparing the Halichondrin B analogs of the present invention from F-9a (LG2 is iodo). First, an intramolecular coupling is achieved, by conditions substantially similar to those described at Scheme V above, to form hydroxyl compound F-10. In an alternate method, the intramolecular coupling is performed in the presence of the chiral oxazole ligand, described herein. The addition of the chiral oxazole ligand imparts a higher yield and greater efficiency for the reaction. The details of this reaction are set forth in the Examples below. Compound F-10 is then oxidized to form F-ll. The hydroxyl protecting groups of F-ll are removed by appropriate means to afford F-12. One of ordinary skill in the art would recognize that the methods appropriate to achieve removal of the protecting groups of compound F-ll depend upon the actual protecting groups used and include those described by Greene. For example, when each of the hydroxyl protecting groups of F-ll is a TBS group, such removal may be achieved by treatment with optionally buffered tetrabutylammonium fluoride. The details of these steps are set forth in the Examples infra.
[0082] Intermediate F-12 is useful for preparing various analogs of Halichondrin B as described in, e.g. United States Patent 6,365,759 and United States Patent 6,469,182 the entirety of which are incorporated herein by reference. EXAMPLES [0083] Using the preparation of Halichondrin B analog B-1939 to exemplify, the following Examples describe the synthesis of Halichondrin B analogs using the methods and compounds of the present invention.
Figure imgf000033_0001
B-1939 [0084] One of ordinary skill in the art would recognize that many analogs of Halichondrin B are prepared by the methods and from the compounds of the present invention including, but not limited to, those analogs of Halichondrin B described in United States Patents 6,214,865 and 6,365,759, the entirety of which are herein incorporated by reference. Accordingly, it will be appreciated that the synthetic methods described below, by way of example, do not limit the scope of the invention which is defined by the appended claims.
Example 1 Preparation of F-la:
ER-806044 ER-806045
[0085] In an appropriately sized vessel, D-glucurono-6,3 -lactone (1 wt, 1 eq.) was combined with ACN (3 vol.) and acetone (9 vol.). Catalytic cone, sulfuric acid was added and the system held at reflux for 3 hours. The system was checked for dissolution of D-glucurono-6,3 -lactone. The reaction was cooled to 25 °C and stirred for 15 hours. Solid sodium bicarbonate (0.5 wts) was added and the reaction stirred for 3 additional hours. Solids were removed by filtration and the organics were partially concentrated and azeotroped with additional ACN (2 wts). ER-806045 was taken into the next reaction without isolation.
Figure imgf000034_0001
ER-806045 ER-806410
[0086] Crude ER-806045 (1 wt, 1 eq.) was dissolved in ACN (6.5 vol.) at -20°C. Pyridine (1.5 vol., 4.0 eq.) was added and SO2C12(0.38 vol., 1.02 eq.) was added slowly, while keeping the internal temperature below 5 °C. The reaction was quenched by inverse addition into cool water (28 vol.) with an ACN rinse (0.5 vol.), keeping the internal temperature below 10 °C. The white solid, ER-806410 (0.87 wt., 79% of theoretical) was isolated by filtration with a heptane rinse (2 vol.) and drying.
Figure imgf000034_0002
ER-806410 ER-806047
[0087] An appropriately sized vessel was charged with ER-806410 (1 wt, 1 eq.) and THF
(10 vol.) and then cooled to 10 °C. Wet palladium on carbon (5%, 0.5 wts) was added and the heterogeneous solution stirred for ten minutes. The reaction was buffered with pyridine (0.44 wts, 1.3 eq.) and placed under a hydrogen atmosphere for 3 hours. The reaction was filtered and the solids rinsed with water (2 vol.) and EtOAc (10 vol.). The resulting solution was acidified with IN HCI (2.1 vol.), mixed well and the resulting layers were separated. The organic layer was sequentially washed with aqueous sodium bicarbonate (5 vol.) and water (5 vol.). The organics were concentrated under reduced pressure and the resulting product recrystallized from IP A (3.4 vol.) and further cropped by the addition of heptane (3.4 vol.) at
15 °C. ER-806047 was isolated as a white solid (67% yield).
Figure imgf000034_0003
ER-806047 ER-806048
[0088] An appropriately sized vessel was charged with ER-806047 (1 wt, 1 eq.) and toluene (8 vol.) and then cooled to -40 °C. A 17 wt% solution of DIBAL in toluene (4.6 wts,
1.1 eq.) was added, keeping the internal temperature below -35 °C. After assaying the reaction, excess reagent was quenched by the addition of acetone (.15 wts, 0.5 eq.), keeping the temperature below 10 °C. The reaction was diluted with EtOAc (7 vol.) and 15% aqueous citric acid (8 wts) below 10 °C, and stirred at 20 °C until a clear solution was obtained. The layers were separated and the aqueous layer back extracted twice with EtOAc (2 x 10 vol.). The combined organics were washed sequentially with aqueous sodium bicarbonate (5 vol.) and brine (5 vol.) and then dried with magnesium sulfate (0.2 wts). After filtration, the organic layers were partially concentrated at reduced pressure, and azeotroped with toluene (4 vol.). The products were stored as a THF solution for use in the next reaction.
Figure imgf000035_0001
ER-806048 ER-807114
[0089] An appropriately sized vessel was charged with a 20 wt% ether solution of TMSCH2MgCl (2.04 wts, 3.0 eq.) and chilled below 5 °C. A THF (7 vol.) solution of ER- 806048 (1 wt, 1 eq.) was added to the reaction vessel keeping the internal temperature below 15 °C. The reaction was warmed to 35 °C for 1.5 hours. The reaction was cooled, diluted with toluene (7 vol.) and quenched with AcOH (3 vol.) below 20 °C. The reaction was further diluted with 10% aqueous ammonium chloride (6 wts), mixed well, and the layers were separated. The organic layer was washed sequentially with aqueous sodium bicarbonate (5 vol.) and brine (5 vol.). After drying over magnesium sulfate (0.2 wts) and filtration, the solution was concentrated under reduced pressure and ER-807114 isolated as a concentrated solution in toluene (90%> yield).
Figure imgf000035_0002
ER-807114 ER-806049
[0090] An appropriately sized vessel was charged sequentially with ER-807114 (1 wt, 1 eq.) and THF (20 vol.), and the solution was cooled below 5 °C. A 15 wt% solution of KHMDS in toluene (9.16 wts, 2.0 eq.) was added. The reaction was quenched with 10% aqueous ammonium chloride (5 vol.). The layers were separated and the organic layer washed sequentially with ammonium chloride (5 vol.), 2N HCI (8.5 vol.), aqueous sodium bicarbonate (5 vol.), and water (5 vol.). The organics were transferred to concentration vessels using EtOAc, and concentrated to a viscous oil (90% yield). The material was recrystallized from toluene (4 vol.) and heptane (4 vol.) at 35 °C with additional cropping at lower temperatures and heptane (2 x 4 vol.) at 15 and 10 °C (94% yield). BnBr. KOtBu, ] V*°
Figure imgf000036_0001
THF, 70% two steps <r
ER-806049 ER-806050
[0091] An appropriately sized vessel was charged with KOtBu (0.67 wts, 1.2 eq.) and THF (7.7 vol.), and cooled to an internal temperature of -20 °C. A solution of ER-806049 (1 wt, 1 eq.) in THF (2.3 vol.) was added keeping the internal temperature below -7 °C. Neat BnBr was added, maintaining -7 °C as the maximum temperature. The reaction was stirred at -20 °C for 2 hours and 10 hours at 10 °C. The reaction was quenched with 10%) aqueous NH C1 (4 wts), diluted with toluene (4 vol.), and mixed well. The layers were separated and the organic layer washed with 10% brine (4 wts) and dried over MgSO (0.15 wts). ER- 806050 was isolated as a tBuOH solution (2.5 vol.) after concentration at reduced pressure (95% yield).
Figure imgf000036_0002
[0092] An appropriately sized vessel was charged sequentially with K3Fe(CN)6 (3.5 wt., 3.4 eq.), K2CO3 (1.5 wt., 3.4 eq.), (DHQ)2AQN (0.0134 wt., 0.005 eq.), water (18 vol.), t- BuOH (13 vol.), and ER-805050 in tBuOH (1 wt, 1 eq. in 5 vol.). The heterogeneous mixture was cooled to an internal temperature of 0°C, and K2OsO -2H2O (0.0029 wt., 0.22 mole%) was added. After 36 hours at 0°C, the reaction was quenched withNa2S2O3 (3.5 eq., 1.7 wt.) and the flask allowed to warm to ambient temperature overnight. After 15 hours, the mixture was transferred to a workup vessel and diluted with toluene (15 vol.) and water (4 vol.). The biphasic mixture was vigorously stirred and separated. The organic layer was washed with brine (10 vol.), and concentrated and solvent exchanged to afford a crude mixture of diols ER-806051 and ER-806052 as a 10% toluene solution (92% yield).
Figure imgf000036_0003
[0093] The toluene solution (10.1 wt%, 9.9 wts) of ER-806051/52 (1 wt, 1 eq.) was further diluted with additional toluene (3 wts). N-Methylmorpholine (0.94 wts, 3.0 eq.) and DMAP (0.075 wts, 0.2 eq.) were added to the toluene solution and the resulting mixture was cooled below 15 °C. Benzoyl chloride was added keeping the internal temperature below 25 °C. The reaction was then stirred for 12 hours at 75 °C. The reaction was cooled to 15°C and the temperature kept below 25 °C during the IN HCI (5 vol.) quench. Layers were mixed well and separated. The organic layer was sequentially washed with brine (3 wts), aqueous sodium bicarbonate (3 wts), and brine (3 wts). The organic layer was dried (MgSO , 0.25 wts), treated with activated carbon (0.1 wts), and filtered (Celite®, 0.3 wts) with a toluene (1 wt). The products were partially concentrated under reduced pressure, azeotroped with toluene (3 wts). Bisbenzoate ER-806053/54 was isolated in 95%) yield as a toluene solution (5 vol.).
Figure imgf000037_0001
[0094] Under an inert atmosphere, a 20 wt%> solution of TiCl4 (6.42 wts, 3.6 eq.) in toluene was cooled to 15 °C. Keeping the internal temperature below 30 °C, Ti(OiPr)4 (0.64 wts, 1.2 eq.) was added, and the resulting solution stirred for 15 minutes. AllylTMS (1.03 wts, 4.8 eq.) was premixed with ER-806053/54 (1 wt, 1 eq.), available as a 22 wt% solution in toluene from the previous step (4.55 wts, 1 eq.), and added to the freshly generated Ti(OiPr)Cl3. The internal temperature during the addition was kept below 30°C. The reaction was stirred between 20-30 °C for 2 hours. The reaction was cooled to -5°C and quenched with IN HCI (6 vol.), keeping the internal temperature below 30 °C. After mixing well, the layers were separated and the organic layer sequentially washed with IN HCI (3 vol.) and brine (2 x 3 vol.). The organic layer was stirred with MgSO4 (0.3 wts) and activated carbon (0.15 wts) and filtered through a Celite® plug (0.2 wts), rinsing with toluene (1 vol.). The product, as a 3:1 mixture at C-34 was isolated after concentration in 83% yield. Recrystallization from IPA/n-heptane afforded ER-806055 with >99.5% d.e. at C-34 (71% yield).
Figure imgf000038_0001
[0095] At room temperature, an appropriately sized vessel was charged with alcohol
ER-806055 (1 wt., 1.0 eq.), toluene (7 vol.), DMSO (0.31 wt., 2.0 eq.) and Et3N (0.78 wt.,
4.0 eq.). The resulting solution was cooled to -19 °C. TCAA (0.84 wt., 1.4 eq.) was added drop-wise, keeping the internal temperature below -10 °C. The reaction was stirred for an additional 10 minutes. The reaction was diluted with IPA (0.5 vol.) and quenched with IN
HCI (5 vol.), keeping the internal temperature below 10 °C. The layers were separated and the organic layer sequentially washed with aqueous NaHCO3 (5 wt.) and water (3 vol.). The organic layer was partially concentrated at reduced pressure (100%) crude yield) and further azeotroped with additional toluene (4 vol.). The resulting ketone (ER-806058) was dissolved in a final 4 vol. of toluene, checked for water content and used as is in the next reaction.
Figure imgf000038_0002
059
[0096] A solution of ER-107446 (1 wt, 1.5 eq.) in THF (2.7 vol.) was cooled to 10 °C and treated with 25.5 wt%> LHMDS in THF (5.2 wt., 1.4 eq.), keeping the internal temperature below 15 °C. In a second vessel, the toluene solution of crude ER-806058 (21.9 wt%, 5.4 vol.) was cooled to 10 °C. The contents of vessel one were transferred into the substrate containing solution, keeping the internal temperature below 20 °C. The reaction was stirred for 30 minutes then quenched by adding 1M HCI (6.5 vol.), keeping the internal temperature below 20 °C. The layers were separated and the organic layer washed four times with 1 :1 MeOH/water (4 x 5 vol.) and then with aqueous bicarbonate (5 vol.), and brine solutions (2 x 5 vol.). The produce was dried over MgSO4 (0.52 wt.), filtered (rinsing with 0.7 vol. of toluene), and concentrated to a heavy oil at reduced pressure.
Figure imgf000039_0001
[0097] ER-806059 was dissolved in 1 : 1 toluene/CH3CN (5 vol.) at room temperature. Filtered TMSI (1.23 wt., 4 eq.) was added, keeping the initial temperature below 40 °C. The reaction was heated to 60°C for 2 hours. The reaction was cooled to -15 ° and quenched with 25% aqueous ammonium hydroxide below 30°C. The reaction contents were stirred overnight and the layers separated. The organic layer was charged with additional toluene (5 vol.) and water (2 vol.). The layers were mixed well and separated. The organic layer was then washed sequentially with 10%) aqueous sodium sulfite (5 vol.), IN HCI (5 vol.), 5% aqueous sodium bicarbonate (5 vol.), and brine (5 vol.). The organic layer was dried over MgSO4 (0.2 wt.), filtered, partially concentrated and used in the next reaction as a 50% solution in toluene.
Figure imgf000039_0002
ER-806060 ER-806061
[0098] In an appropriately sized vessel, NaBH(O Ac)3 (1.19 wt, 3.15 eq.), B114NCI (1.04.wt, 2.1 eq.), DME (8.2 vol.), and toluene (4 vol.) at 65°C, were combined and stirred at room temperature. The mixture was heated to 75 °C for one hour. ER-806060 (1 wt., 1 eq.) as a 50% wt solution in toluene was added at 75 °C and rinsed in with additional toluene (0.3 vol.). The reaction temperature was raised to 85 °C and the reaction stirred for 2-4 hours. The reaction was cooled to < 10 °C and quenched with water (3.2 vol.) keeping the internal temperature below 20 °C. The layers were mixed well and separated. The organic layer was sequentially washed with aqueous sodium bicarbonate (2 x 5 vol.) and water (2 x 5 vol.). The organic layer was concentrated and solvent exchanged to afford a 40 wt% solution of ER- 806061 in MeOH.
Figure imgf000040_0001
[0099] A 40 wt% solution of ER-806061 (1 wt., 1.0 eq.) in MeOH was dissolved in additional methanol (1.6 vol.). Potassium carbonate (0.24 wts, 1.0 eq.) was added and the reaction temperature was raised to 50 °C for one hour. The reaction was cooled to 15 °C, and quenched with IN HCI (3.5 vol., 2 eq.) with the internal temperature below 30°C. The reaction was diluted with water (3.9 vol.) and toluene (3 vol.). The layers were separated and the aqueous layer back extracted with toluene (1.5 vol.). The aqueous phase was charged with sodium bicarbonate (0.3 wts) and sodium chloride (0.6 wts), and back extracted with nBuOH (3 vol.). The three organic phases were combined and concentrated to dryness to afford crude triol ER-806064 and inorganic salts. The product was dissolved in 7:1 toluene/nBuOH at 80°C, hot filtered, and recrystallized by cooling and stirring overnight. ER-806064 (F-lb) was isolated in a 57%>, five step overall yield after filtration and a toluene rinse. FAB(+)-MS m/z 357 (M + H). Melting point 96 .2 °C.
Figure imgf000040_0002
[00100] Purified triol ER-806064 (1 wt., 1 eq.) was dispersed in acetone (2 vol.), diluted with 2,2-dimethoxypropane (1 vol.), and treated with cone, sulfuric acid (0.0086 wts, 0.03 eq.) at 25°C. The reaction was stirred until homogenous. The reaction was diluted with toluene (5 vol.) and quenched by the addition to 5% K2CO3 (2 vol.). The layers were mixed well and separated. The organic layer was washed with 10% brine, dried with Na2SO (0.5 wt.). The solution was filtered (toluene rinse) and concentrated at reduced pressure to afford ER-806126 as a yellow oil. The material was used as is in the next stage.
Figure imgf000041_0001
[00101] Solid NaOtBu (0.34 wt., 1.4 eq.) was dissolved in THF (2.7 vol.) and DMF (0.3 vol.), and then cooled below 10°C. A solution ER-806126 (1 wt., 1 eq.) in THF (2.5 vol.) was added to the NaOtBu solution with a THF rinse (0.5 vol.), keeping the internal temperature below 15°C. After a 30 minute stir, methyl iodide (0.204 vol., 1.3 eq.) was added keeping the temperature below 15°C (exothermic). The reaction was warmed to 25°C and the reaction quenched with water (5 vol.) and diluted with toluene (7 vol.). The layers were mixed well and separated. The organic layer was washed twice with brine (2x5 vol.), dried over Na2SO4 (0.5 wt.), filtered, and concentrated under reduced pressure.
Figure imgf000041_0002
[00102] ER-806068 (1 wt., 1 eq.) was dissolved in 1 vol. of MeOH. Water (1.5 vol.) and 2
N HCI (1.25 vol., 1 eq.) were added and the reaction stirred at 25°C. The reaction was quenched by inverse addition to 2M NaOH (1.34 vol.) at 10 °C. The reaction was diluted with isopropyl acetate (5 vol.), the layers were mixed well and separated. The aqueous layer was back extracted with 5 vol. of isopropyl acetate and the combined organic layers were dried over MgSO4 (0.5 wt.), filtered, and concentrated at reduced pressure to afford crude diol ER-806063.
Figure imgf000041_0003
[00103] To a 25°C solution of crude ER-806063 (1 wt., 1.0 eq.) in DMF (4 vol.), was charged imidazole (0.62 wt., 3.4 eq.), followed by TBSCI (1.02 wt., 2.53 eq.) with the internal temperature below 30 °C. The reaction was stirred at 25 °C. The reaction was diluted with MTBE (10 vol.) and washed with H2O (4 vol.). The organic layer was washed sequentially with 1M HCI (3 vol.), water (3 vol.), aqueous sodium bicarbonate (3 vol.), and brine (3 vol.). The organic layer was dried over MgSO (0.5 wt.), filtered with one volume MTBE rinse, and concentrated at reduced pressure and solvent exchanged for heptane (4 vol.).
Figure imgf000042_0001
[00104] ER-806065 (1 wt., 1 eq.) was dissolved in heptane, isooctane, or IPA (10 vol.) The solution was cooled below -60 °C (± 10 °C). Ozone was bubbled through the solution at low temperature until the solution retained a blue color. Nitrogen was purged through the solution for 15-30 minutes, and the reaction warmed to 5 °C while the nitrogen flush was continued. 7-15 wt. %> Lindlar Catalyst (5% Pd on CaCO3 poisoned with Pb, 0.1 wt.) was added. The reactor head was purged several times with nitrogen, evacuated, and placed under 1 atmosphere H2 (g). The reaction was then warmed to room temperature (20-25 °C). The reaction was stirred for 2.5 hours. The resulting heterogeneous solution was filtered through Celite® (1.0 wt.) with an MTBE (2 vol.) rinse. The solution was concentrated to dryness, isolating 1.0 wt. of crude ER-806067. The crude isolate was recrystallized from heptane or isooctane to afford ER-806067 (F-la) as a white crystalline solid in a 68% five step yield. FAB(+)-MS m/z 601 (M + H). Melting point 64.5 °C.
Example 2
Preparation of F-2a:
/ .0. X
Figure imgf000042_0002
[00105] A reactor was charged with pre-rinsed Amberlyst 15 (0.05 wt.) and water (4.63 vol.) and cooled to an internal temperature of 0-5°C. The reactor was charged with 2,3- dihydrofuran (1 wt., 1 eq.) and stirred for 1.5 hours maintaining internal temperature around 5°C. A second reactor was charged with water (4.63 vol.) and heated to an internal temperature of 35°C. The same reactor was charged with tin powder (2.2 wt., 1.3 eq.), distilled 2,3-dibromopropene (3.71 wt., 1.3 eq.), and 48%) hydrobromic acid (0.002 vol.), respectively. After observation of reaction initiation indicated by a temperature spike to 36-
38°C, the second reactor was charged with 2,3-dibromopropene portion-wise (9 x 0.37 wt.) while maintaining the internal temperature below 45 °C. After complete addition, the contents of the second reactor were stirred at an internal temperature of 35°C for an additional 60 minutes. The filtered contents of the first reactor were charged into the second reactor at a rate such that internal temperature did not exceed 45°C. After complete addition, the heat source was removed and the second reactor was charged with Celite® 545 (2.0 wt.) and the resulting mixture stirred for 30 minutes. The heterogeneous mixture was filterred through a Celite® 545 pad (2.0 wt.) and the cake washed with additional water (5 vol.). All filtrates were combined into a reactor and charged with concentrated hydrochloric acid (1.5 vol.) until the cloudy solution becomes clear. With vigorous stirring, the reactor was charged with sodium chloride (3.6 wt.) and the layers allowed to partition. The organic layer was separated and set aside. The aqueous layer was extracted with n-butanol (20 vol.). The aqueous layer was drained and the reactor charged with the organics from the first separation.
The organics were washed with concentrated sodium bicarbonate (24 vol.), followed by a back extraction of the aqueous layer with n-butanol (20 vol.). All organics were combined and concentrated in vacuo. The concentrate was dissolved in MTBE (10 vol.), filtered and the filtrate was concentrated to two vol. With stirring, the concentrate was cooled to an internal temperature of 0°C and then n-heptane (4 vol.) was added. The heterogenous mixture was stirred for 2 hours at an internal temperature of 0°C and the desired product was isolated via filtration and dried under vacuum to yield ER-806909 (1.34 wt., 0.45 eq.) as a white powder.
Figure imgf000043_0001
[00106] A reactor was charged with imidazole (0.65 wt., 2 eq.), ER-806909 (1 wt., 1 eq.), and anhydrous DMF (4.04 vol.). With stirring, the reactor was cooled to an internal temperature of 0°C and then with tert-butylchlorodiphenylsilane (1.25 wt., 0.95 eq.) at a rate such that internal temperature did not exceed 15°C. While maintaining the internal temperature < 15°C, the reaction was stirred for an additional 1 hour. The reactor was charged with water (3.2 vol.) and n-heptane (6.4 vol.). The mixture was stirred for 5-15 minutes and the layers allowed to separate. The organic layer was separated and set aside. The aqueous layer was extracted with n-heptane (3.2 vol.). All organics were combined and washed with brine (3.2 vol.) and concentrated in vacuo to a constant weight to yield ER- 806545 (2.13 wt., 0.95 eq.) as a yellow oil. The product was utilized in the next stage without further purification.
Figure imgf000044_0001
ER-806909 ER-808373 ER-806721
[00107] The enantiomers of ER-806909 were separated via Simulated Moving Bed (SMB) chromatography to yield ER-808373 (0.55 wt., 0.55 eq.) and ER-806721 (0.45 wt., 0.45 eq.) as yellow oils. The SMB chromatography protocol used to separate the enantiomers of ER-806909 is as follows.
Columns and media: Chiracel OD 20 μm 30 mm x 150 mm (12 columns)
Solvent system: 96:4 (vol/vol) heptanertert-butanol (mobile phase) Simulated Moving Bed
Chromatography apparatus: Knauer SMB System CSEP C912
Isotherms (Langmurian, determined by frontal analysis):
Undesired isomer: Qi*= 2.8768 x Ci/(l+0.02327 x Ci)
Desired isomer: Qi=4.5320 x Ci/(l+0.0034595 x Ci)
* Where Qi =solid phase concentration (in g/L) and Ci= liquid phase concentration
(g/L).
Column porosity: 0.658
Temperature: 27 °C
Flow rates, etc. calculated by simulation on EuroChrom 2000 for Windows. SMB Guide ver.1.2, Wissenschaftliche Geratebau Dr.-Ing. Herbert Knauer GmbH, D-14163 Berlin; authors, H. Kniep and A. Seidel-Morgenstern:
Feed concentration: 36 g/L (ER-806909)
Feed flow rate (Pump 1): 15 mL/niin
Eluent flow rate (Pump 2): 76.4 mL/min
Zone IV (Pump 3) flow rate: 107 mL/min
Zone II (Pump 4) flow rate: 134.3 mL/min (actual flow rate = 143.5 mL/min)
Zone I flow rate: 183.4 mL/min
Zone III flow rate : 149.3 mL/min
Raffinate* flow rate: 42.3 mL/min *Raffinate = weakly bound isomer
Extract flow rate: 49.1 mL.min *Extract = strongly bound isomer Tact time
(port switching time): 0.8864 min (53.18 sec, actual tact time = 54 sec)
[00108] The enantiomers of ER-806909 were separated using the above protocol in the following manner. For an 11 hour run, 10 L of 36 g/L ER-806909 in mobile phase was pumped (Silog model Chemtech) through a 142 mm diameter 0.45 μm pore size nylon filter (Cole-Parmer # 2916-48) and into the Feed tank. The Eluant tank was filled with 36L mobile phase that has been filtered through an in-line 45 mm diameter 1 μm glass fiber filter (Whatman GFC), additional vol. were added throughout the run. The internal temperature of the SMB apparatus was adjusted to 27 °C.
[00109] For initial startup, the Feed and Eluant inlets were both connected to the Eluant tank. The Feed and Eluant pumps were primed and purged with mobile phase solvent. The SMB apparatus column switching was initiated, the pumps were turned on and the flow rates were gradually increased to full speed while maintaining absolute flow rate differences between each pump. Once full speed was achieved the Raffϊnate and Extract flow rates were measured and adjustments to pump flow rates were made to correct for deviations in pump specifications. The Feed pump (Pump 1) was reduced to 0 mL/min, the inlet reconnected to the Feed tank, the pump primed with Feed solution and then the flow rate gradually increased back to full operating speed. The Raffmate and Extract outlets were collected into separate tanks and samples of each of each were acquired every 2 hours. The samples were monitored for chiral purity by analytical HPLC using the HPLC method set forth below. Adjustments to the flow rates of Pumps 2, 3 and 4 as well as to the tact time were made to afford the desired outlet purities.
[00110] At the end of the run, the Feed pump was once again reduced to zero flow rate and connected to the Eluant tank. The Feed pump was brought back to full speed and the system was allowed to wash for 20 minutes. The Raffmate and Extract outlets were maintained for 10 minutes (10 tacts) during the wash period and, for the remainder of the wash, the outlets were collected into a separate tank. The column wash was eventually concentrated and added to the Feed on subsequent runs.
[00111] The collected Extract (ER-806721) at the end of each run was pooled with material collected from the same starting material lot and the final pooled lot was analyzed again for chiral purity by the analytical HPLC method described in Table 1 below. The same procedure was applied to the collected Raffmate (ER-808373). Table 1. HPLC Analysis of ER-806721 chiral purity:
Column: Chiracel OD 10 um 250 x 4.6 mm, DAICEL Chemical Industries,
Ltd., cat. no. 14025 Flow rate : 0.8 mL/min Temp. (°C): 27 preferred over 35
Inj. Vol.: 10 uL usually, sample in Solvent A, 5 mg/mL Instrument: Waters Alliance W2690 with UV W2487 (also with Advanced Laser
Polarimeter) Mobile Phase Constituents: (PDR-Chiral, Inc.) A 99:1 Heptane : 2-Propanol
B
C
D
Gradient Table: (%) Gradient
Time (min) A B C D
0 100 0 0 0 isocratic
Run time 30 min
Detection: Absorbance at 254 nm UV
PNBA, DEAD, PPh3, Toluene, 0 C LiOH, THF, H20
OH OPNB OH
Br „OTBDPS OTBDPS ,OTBDPS
Br Br ER-808373 ER-806721
[00112] A reactor was charged with triphenylphosphine (0.7 wt., 1.2 eq.), p-nitrobenzoic acid (0.45 wt., 1.2 eq.), ER-808373 (1 wt., 1 eq.), and anhydrous toluene (8 vol.). The reaction was cooled to internal temperature of 0 °C and DEAD (1.17 wt., 1.2 eq.) was slowly added at a rate such that the internal temperature did not exceed 7°C. n-Heptane (3.3 vol.) was added and the mixture cooled to an internal temperature 10°C then stirred for 30-40 minutes. The resulting precipitate was removed by filtration. The filter-calce was washed with n-heptane (3.3 vol.), TBME (0.55 vol.), n-heptane (1.1 vol.), and MTBE (0.55 vol.), respectively. All filtrates were combined and concentrated in vacuo. The crude concentrate was dissolved in THF (8 vol.) then water (0.8 vol.) and lithium hydroxide dihydrate (0.18 wt., 2 eq.) were added. The mixture was stirred at ambient temperature then n-heptane (3.3 vol.) was added and stirred for 5 minutes. Water (2.2 vol.) and n-heptane (3.3 vol.) were added, the biphasic mixture was stirred for 5 minutes, and the layers were allowed to partition. The aqueous layer was separated and back extracted with n-heptane as necessary. The organic layers were combined and concentrated in vacuo. The crude product was purified via SiO2 column chromatography to yield ER-806721 (0.74-0.85 wt., 0.74-0.85 eq.) as a light yellow oil.
I, OH TsCI, DMAP, CH2CI2, QTs
Rr-' U /'^ =^/^/ ΠOTTΠBΠDDPSC rt, 48 hr ^ M - ■• .. OTBDPS
Br Br ^^ ^-^ ^"^
ER"806721 ER-807204
[00113] A reactor was charged with ER-806721 (1 wt., 1 eq.) and anhydrous dichloromethane (4.2 vol.). The reaction was cooled to an internal temperature of 0-5 °C, then triethylamine (0.34 wt., 1.5 eq.), p-toluenesulfonyl chloride (0.51 wt., 1.2 eq.), and 4- (dimethylamino)-pyridine (0.001 wt., 0.25 eq.) were added. The resulting mixture was stirred at ambient temperature for 48 hours then water (1.8 vol.) and dichloromethane ( 1.8 vol.) were added. After sufficient mixing, the organics were separated and concentrated the organics. The concentrate was dissolved in MTBE (1.8 vol.) and washed with brine (1.8 vol.). The organic layer was separated and set aside. The aqueous layer was back extracted with MTBE (1.8 vol.) then all organics were combined and concentrated in vacuo. The crude oil was filtered through a plug of SiO2 (70-230 mesh, 1 wt.) eluting with MTBE (7 vol.) and the filtrates were concentrated in vacuo. The conentrate was dissolved in IP A (5 vol.) and water (0.25 vol.) was added. The resulting mixture was cooled to an internal temperature of 15 °C and then seeded with ER-807204. After seeding, the mixture was cooled to an internal temperature of 0°C and stirred for 4-5 hours. The suspension filtered, the filter cake was washed with cold IPA (1 vol.), and the cake dried in vacuo to a constant weight to yield ER- 807204 (1.05 wt., 0.78 eq.) as a white powder. IR (thin film, cm-1) λ 2597, 1633, 1363, 1177, 907, 729. LRMS m/z 602 (M + H).
Figure imgf000047_0001
ER-806906 ER-805552
[00114] A reactor was charged with 21%> sodium ethoxide in ethanol (2.97 wt., 0.9 eq.). The solution was heated to an internal temperature of 65°C then diethyl malonate (3.24 wt., 2 eq.) was added at a rate such that the internal temperature did not exceed 70°C. The mixture was stirred for 30 minutes and then ER-806906 (1 wt., 1 eq.) was added over 3-5 hours. Upon complete addition, the reaction was stirred for 60 minutes and then cooled to an internal temperature of 50°C. Concentrated hydrochloric acid (0.84 wt., 1.05 eq.) was added at a rate such that internal temperature did not exceed 65°C. The DMF (3 vol.) and ethanol were removed via distillation then a solution of magnesium chloride hexahydrate (0.21 wt., 0.1 eq.) in distilled water (0.25 vol., 1.4 eq.) was added. The resulting mixture was heated to an internal temperature of 135°C while removing the distillate. The mixture was heated at reflux then cooled to room temperature and brine (12 vol.) and TBME (16 vol.) were added. The organic layer was separated and washed with water (1.3 vol.) and brine (1.2 vol.) then concentrated in vacuo. The product was purified via distillation to yield ER-805552 (0.95- 1.09 wt., 0.71 eq.).
Figure imgf000048_0001
Methyl iodide, LiHMDS in toluene,
ER-805552 THF, -78 C ER-806724
[00115] A reactor was charged with LHMDS 1.0 M in toluene (6.61 wt., 1.04 eq.) and cooled to an internal temperature of -75 °C. ER-805552 (1 wt., 1 eq.) was dissolved in anhydrous THF and added to the reactor at a rate such that internal temperature did not exceed -70°C. Upon complete addition, the resulting mixture was stirred for 30 minutes. A second reactor was charged with anhydrous THF (2.5 vol.) and methyl iodide (1.27 wt., 1.25 eq.) and cooled to an internal temperature of -75°C. The solution of ER-805552 in THF was added into the methyl iodide solution at a rate such that internal temperature did not exceed - 65°C. Upon complete addition, the reaction was stirred at an internal temperature of -78°C for 30 minutes. The reaction was inverse quenched a solution of 1 N hydrochloric acid (10 vol.) and MTBE (8 vol.) with vigorous stirring. After complete addition, the aqueous layer was separated and discarded. The organic layer was washed with brine solution (3 vol.) and concentrated in vacuo and the product purified via distillation to afford ER-806724 (0.75 wt.) as a ~6 /l mixture of diastereomers.
Figure imgf000048_0002
2) TBS-CI, imidazole, DMF, rt
ER-806724 ER-806753
CgH^4θ2 C17H35N03Si
Mol. Wt.: 154.21 Mol. Wt.: 329.55 6.5 / 1 anti / syn [00116] A reactor was charged with N,O-dimethylhydroxylamine HCI (1.05 wt., 1.5 eq.) and anhydrous CH C12 (8.1 vol.) and cooled to an internal temperature of 0 °C. 2 M trimethylaluminum in toluene (3.93 wt., 1.5 eq.) was added at a rate such that internal temperature did not exceed 5°C. The reaction was stirred for an additional 10 minutes and ER-806724 was added at a rate such that internal temperature did not exceed 5°C. The reaction was diluted with CH2C12 (15 vol.) then inverse quenched into 1.3 M sodium tartrate (20 vol.) at an internal temperature of 0°C at a rate such that the internal temperature did not exceed 10°C. After complete addition, the layers were partitioned and the aqueous layer was separated and set aside. The organics were washed with water (1 vol.), dried over sodium sulfate (1 wt.), filtered and concentrated in vacuo until minimal methylene chloride was being removed. To the concentrate was added anhydrous DMF (6.3 vol.), imidazole (0.64 wt., 1.5 eq.) and t-butyldimethylsilyl chloride (0.94 wt., 0.97 eq.), respectively. Water (5 vol.) and MTBE (10 vol.) were added and the resulting mixture stirred then the layers were allowed to partition. The aqueous layer was separated and discarded. The organic layer was washed with water (5 vol.) and the layers separated. 1 N sodium hydroxide (2.5 vol.) and methanol (2.5 vol.) were added and the resulting mixture stirred. The aqueous layer was separated and the organic layer washed with brine (2.5 vol.) then concentrated in vacuo to afford ER- 806753 (1.94 wt., 0.91 eq.) as a brown oil.
Figure imgf000049_0001
[00117] A reactor was charged with ER-806753 (1 wt., 1 eq.), CH2C12 (5 vol.) and NMO- 50% in water (0.8 wt., 1.1 eq.). The mixture was cooled to an internal temperature of 10°C and then 0.197 M OsO4 in toluene (0.06 vol., 0.004 eq.) was added. Sodium sulfite (0.1 wt., 0.25 eq.) and water (0.85 vol.) were added and the reaction stirred for 1 hour. The mixture was diluted with brine (0.85 vol.) and the organics were concentrated in vacuo to approximately 1/3 vol. A second reactor was charged with sodium periodate (1.3 wt., 2 eq.) followed by THF (2.5 vol.). The mixture was diluted with pH = 7 phosphate buffer (3.0 vol.) and cooled to an internal temperature of 20°C. The concentrated diol was added at a rate such that the internal temperature did not exceed 30°C. After complete addition, the resulting mixture was stirred at room temperature. Water (1.25 vol.), MTBE (7 vol.) and brine solution (1.25 vol.) were added and the layers separated. The organics were washed a second time with a mixture of brine solution (1 vol.) and saturated sodium bicarbonate (1 vol.). Finally, the organics were stirred over a mixture of brine (1 vol.) and 10%) (w/v) sodium thiosulfate solution (1 vol.) for 1 hour then concentrated in vacuo. The crude material was purified via SiO2 column chromatography to yield ER-806754 (0.93 wt., 0.93 eq.) as a yellow oil. IR (thin film, cm-1) λ 2953, 2856, 1725, 1664, .1463, 1254, 1092, 833. LRMS m/z 332 (M + H).
Figure imgf000050_0001
ER-807524
[00118] A reactor was charged with ER-806629 (1.53 wt., 3.1 eq.) and THF (10.5 vol.) and the solution was degassed with nitrogen sparge for 60 minutes. A second inerted reactor was charged with ER-807204 (1 wt., 1.0 eq.), ER-806754 (0.66 wt., 1.2 eq.) and THF (2.7 vol.) and this solution was degassed with argon sparge for 45 minutes. A reactor containing ER-806906 was charged with CrCl2 (0.63 wt., 3.1 eq.) and followed by Et3N (0.52 wt., 3.1 eq.). The dark green suspension was stirred at an internal temperature of 30 to 35°C for 1 hour, cooled to 0 to5 °C and then NiCl2 (0.1 eq.) was added. The first reactor was charged with the contents of the second reactor slowly over 0.5 hours and the reaction allowed to warm to rt. The reaction was cooled to an internal temperature of 0 °C then ethylenediamine (1.0 wt., 10 eq.) was added over 30 minutes and the reaction stirred at an internal temperature of 25°C for at least 30 minutes. To the reaction was added water (4 vol.), TBME (10 vol.) and n-heptane (1 vol.) and the resulting mixture stirred for 15 minutes and the phases allowed to separate (~30 min). The aqueous phase was separated and back extracted with TBME (-7.5 vol.). The organic layers were combined and washed with water (5 vol.), brine (3 vol.), and concentrated in vacuo to minimum volume. To the crude mixture was added IPA (10 vol.) and SiO2 (1 wt.) and the resulting mixture stirred at an internal temperature of 25 °C for up to 4 days. The slurry was filtered and the filter cake washed with IPA (2 X 1 volume). To the filtrate was added n-heptane (6.6 vol.) and the mixture was concentrated in vacuo until a suspension formed. The mixture was filtered and the cake washed with n-heptane then the mixture was concentrated in vacuo. The crude product was purified via SiO2 column cliromatography to yield ER-807524 (0.54 wt., 0.48 eq.), as a clear yellow oil. IR (thin film, cm-1) λ 2934, 1668, 1471, 1108, 833. LRMS m/z 704 (M + Na).
Figure imgf000051_0001
ER-807524 ER-807525
[00119] A reactor was charged with ER-807524 (1 wt., 1 eq.) and anhydrous THF (1.25 vol.). The mixture was cooled to an internal temperature of -20 °C and 3 M methyl magnesium chloride (0.59 vol., 1.2 eq.) was added at a rate such that the internal temperature did not exceed 0°C. Upon complete addition, the mixture was warmed to an internal temperature of 0°C over 2 hours. The reaction mixture was inverse quenched into semi- saturated ammonium chloride (2.62 vol.) and the resulting mixture diluted with TBME (2 vol.) with vigorous mixing. The aqueous layer was discarded and the organics washed with brine (2 vol.) then concentrated in vacuo. The crude product was purified via SiO2 column chromatography to yield ER-807525 (0.79-0.82 wt., 0.85-0.88 eq.) as yellow oil.
Figure imgf000051_0002
ER-807525 ER-807526
[00120] A reactor was charged with ER-807525 (1 wt., 1 eq.), N- phenylbistrifluoromethanesulfonamide (0.59 wt., 1.1 eq.), and anhydrous THF (4.1 vol.) and the mixture cooled to an internal temperature of -75°C. 0.5 M KHMDS in toluene (2.75 wt., 1 eq.) was added at a rate such that internal temperature did not exceed -60°C then the reaction was warmed to-20°C over 2 hours. The reaction was quenched with semi-saturated NH4C1 (2.4 vol.) at a rate such that internal temperature did not exceed 0°C. The mixture was warmed to an internal temperature of 20 °C and n-heptane (2.4 vol.) was added. The mixture was stirred and the aqueous layer was separated and discarded. The organic layer was washed three times with saturated sodium bicarbonate (2.3 vol. each) then concentrated in vacuo to yield ER-807526 (1.2-1.4 wt., 1.0-1.2 eq.). The material was utilized in the next stage without further purification.
Figure imgf000052_0001
ER-807526 ER-807527
[00121] A reactor was charged with ER-807526 (1 wt., 1 eq.) and anhydrous methanol (3 vol.) at 20°C. 1.25M HCI in IPA (4 vol., 5 eq.) was added and the mixture stirred for 3 hours. Solid NaHCO3 (0.42 wt., 5 eq.) was added portion-wise with stirring until the pH of the reaction mixture reached 6-7. The reaction mixture was filtered with methanol (3 x 2 vol.) washes. All filtrates were concentrated in vacuo and then purified via SiO2 column chromatography to yield ER-807527 (0.43 wt., 0.79-0.85 eq.).
Figure imgf000052_0002
ER-807527 ER-806730
[00122] The diastereomeric mixture of ER-807527 was separated by preparative HPLC cliromatography and the desired fractions concentrated to yield ER-806730 (0.56 wt., 0.56 eq.) as a clear yellow oil. The preparative HPLC chromatography protocol used to isolate ER-806730 is as follows.
Column and Media: Kromasil spherical silica 60 A, 10 μm particle size packed to
7.7 cm (diam.) x 30 cm (length) in a 7.7 cm x 60 cm Varian Dynamax Rampak column.
HPLC Packing Station: Varian (Rainin) Dynamax Rampak 41/77 mm Column Packing
Station HPLC Pumps: Varian (Rainin) SD-1 Titanium Pump Heads
Primary HPLC Detector: Waters R403 Refractive Index detector
Secondary HPLC Detector: Varian (Rainin) UV-1 detector with preparative flow cell
Chromatography Control and Acquisition Software: Varian (Rainin) Dynamax DA version 1.4.6
Chromatography Data
Processing Software: Varian (Rainin) Dynamax R version 1.4.3
Mobile Phase: 28.5 : 63.7 : 7.85 (vol/vol) n-heptane: methyl tert-butyl ether :
2-propanol
Flow Rate: 140 mL/min
Column Temperature: Ambient (25 °C)
Detection: Refractive Index, negative polarity at 16 X attenuation and UV at 215 nm.
Mobile Phase Gradient: Isocratic
Run Time: 40 minutes
Injection Volume: 10 ml of 0.8 g/mL of ER-807527
[00123] The above protocol was used to separate the diastereomers of ER-807527 in the following manner. Each lot of ER-807527 was first diluted to 0.1 g/ml in the mobile phase and filtered under vacuum through a 47 mm, 1 μm pore size, glass fiber filter (Whatman GFC). The filtrate was then concentrated under vacuum on a rotary evaporator. Flow on the SD-1 HPLC pump A (primed and purged with mobile phase) was initiated and the flow rate gradually increased to 140 mL/minute. The system was washed until the UV and RI detectors achieved a stable baseline. The RI detector reference flow cell was flushed with fresh mobile phase.
[00124] Cliromatography of 8 g injections of ER-807527 was accomplished by diluting the current lot of ER-807527 to a concentration of 0.8 g/mL in the mobile phase. Injecting 10 mL aliquots of the dissolved material and collecting the eluant corresponding to the ER- 806730 peak approximately beginning at the peak apex approximately 24 minutes and continuing to 35 minutes. Subsequent injections and fraction collection were continued until the starting material is exhausted.
[00125] The fractions corresponding to ER-806730 were pooled and concentrated under vacuum on a rotary evaporator. The diastereomeric purity and area-% purity area were assessed using the HPLC analytical method described in Table 2. Table 2. HPLC Analysis of Diastereomeric Purity of ER-806730:
Column: Kromasil Slica 250 x 4.6 mm, 5 μm , MetaChem cat. no. 0475-250X046
Flow rate: 1 mL/min
Temp. (°C): 27
Inj. Vol.: 10 uL, sample in Solvent A, 2.5 mg/mL
Instrument: Waters Alliance W2690 with UV W2487
Mobile Phase Constituents:
30:67:3 n-Heptane: Methyl tert-Butyl Ether:2-Propanol
B 2-Propanol
C
D
Gradient Table: (%) Gradient
Time (min) A B c D
0 100 0 0 0 isocratic
22 100 0 0 0 isocratic
26 90 10 0 0 linear
32 90 10 0 0 isocratic
Run time 3322 mmiinn ^ with 18 min re-equilibration time at initial conditions
Detection: Absorbance at 205 nm UV
Figure imgf000054_0001
ER-806730 ER-806732
[00126] A reactor was charged with ER-806730 (1 wt., 1 eq.) and anhydrous dichloromethane (4.8 vol.) and cooled to an internal temperature of 0°C. 2,4,6-Collidine (1.16 wt., 4 eq.) and DMAP (0.03 wt., 0.1 eq.) were added and the resulting mixture stirred for 15 minutes and then trimethylacetyl chloride (0.3 wt., 1.05 eq.) was added at a rate such that internal temperature did not exceed 10°C. Water (3 vol.) was added and the mixture stirred for 15 minutes. TBME (10 vol.) was added and the mixture stirred for an additional 10 minutes. The organic layer was washed with IN HCI (10 vol.) washing until a negative result for 2,4,6-collidine is obtained then with water (5 vol.), saturated sodium bicarbonate (5 vol.), and saturated brine (5 vol.), respectively. The organic lyaer was concentrated in vacuo and the concentrate purified via SiO column chromatography to yield ER-806732 (1.02 wt., 0.85 eq.) as a yellow oil.
Figure imgf000055_0001
ER-806732 ER-805973
[00127] A reactor was charged with ER-806732 (1 wt., 1 eq.) and anhydrous THF (2.35 vol.) and cooled to an internal temperature of 0°C. Triethylamine (0.22 wt., 1.1 eq.) was added followed by methanesulfonyl chloride (0.24 wt., 1.05 eq.) at a rate such that internal temperature did not exceed 10°C. The reaction was stirred at an internal temperature of 0°C then n-heptane (3.4 vol.) was added with vigorous stirring and the layers were allowed to partition. The organics were washed with saturated brine (3.4 vol.), dried over saturated sodium sulfate (2 wt.), filtered and the cake washed with n-heptane until a negative result for ER-805973 (F-2a) was obtained. The filtrates were concentrated in vacuo to obtain ER- 805973 (1.12 wt., 0.97 eq.). The crude ER-805973 (F-2a) was used in the next stage without further purification. IR (thin film, cm-1) λ 2961, 1725, 1413, 1208, 926. LRMS m/z 579 (M + H).
Example 3 Alternate Preparation of ER-806730:
Figure imgf000055_0002
quinic acid 1
[00128] Quinic acid (lwt), cyclohexanone (2.11 eq, 1.08 wt), and cone, sulfuric acid (0.011 eq, 0.0056 wt) were added to a reactor. The reaction mixture was heated to 160°C and water was removed by azeotropic distillation (azeotrope begins at 100 °C). The reaction was cooled to 90 °C to 100 °C and sodium bicarbonate (0.0096 wt) and toluene (3.6 wt) were added. The reaction was cooled to ambient temperature over 4-6 hours and the resulting precipitate was filtered, washed with toluene (2 x 0.9 wt), and dried to provide 1 (0.97 wt) as a white powder.
Figure imgf000056_0001
1 Ac20 2a X=0; Y= OTMS c. recrystallized 2b X=H, OH; Y=OTMS
2c X=H, OAc; Y=Ac
[00129] Compound 1 (1 eq, lwt) and imidazole (2.5 eq, 0.80wt) were combine, purged with N2, and supended in anhydrous THF (10 v). TMSC1 (1.2 eq, 0.61 wt) was added at a rate that maintained the temperature below 30 °C. The reaction was cooled to ambient temperature, heptane (10 v) was added and the resulting suspension filtered. The filter cake was washed with 1:1 hpt/THf (10 v) the filtrate solvent was exchanged with toluene by atmospheric distillation to provide a solution of 2a (calcd. at 1.34 wt ) in toluene (~5 wt). [00130] The solution of 2a was cooled to -78 °C and DIBAL-H (1.5 M in toluene, 1.2 eq, 2.1 wt) was added at a rate that maintained the temperature below -65 °C. The excess DIBAL-H was quenched with MeOH (0.3 eq, 0.034 wt) and and the solution warmed to 0 °C. The solution was transferred to a solution of 30% wt/wt aqueous Rochelle salt (10 wt) and sodium bicarbonate (1 wt) at a rate that maintained the temperature below 25 °C. The mixture was stirred vigorously to obtain a biphasic solution. The layers were separated and the aqueous layer was extracted with MTBE (5v). The combined organic layers were washed with water (2.5 wt) and then saturated brine (2.5 wt). The organics were concentrated and solvent exchanged with THF to provide a solution of 2b (calcd. at 0.98 wt) in THF (5 v). [00131] The solution of 2b was cooled to 5 °C and acetic acid (2.9 eq, 0.51 v) was added. Water (1.0 eq, 0.055 v) was added and the solution stirred at 0 °C to 5 °C. Up to two additional aliquots of acetic acid and one aliquot of water were added as needed to facillitate deprotection of the silyl group. Et3N (12 eq, 3.6 wt) and DMAP (0.05 eq., 0.02 wt) were added at a rate that maintained the T below 20 °C. Acetic anhydride (6 eq, 2.0 wt) was added and the reaction stirred at rt. The reaction was cooled to 5 °C and added to saturated aqueous sodium bicarbonate (10 v) at a rate that maintained the temperature below 30 °C. The resulting mixture was allowed to stir for 3-4 hours and the layers allowed to separate. The aqueous layer was extracted with MTBE (5 v) and the combined organics were washed with a water (5 v). The extracts were solvent exchanged with IPA by distillation to provide a solution of 2c in IPA (3 v). The solution was cooled to 5 °C and the resulting crystalls were filtered. The mother liquor was concentrated and a second crop obtained after recrystallization to provide 2c (0.87 wt) as a white crystalline solid.
Figure imgf000057_0001
[00132] 2c (1 wt) was dissolved in acetonitrile (6 v) and methyl 3-trimethylsilylpent-4- eneoate (3.0 eq, 1.86 wt) was added followed by TFAA (0.2 eq, 0.083 v). BF3OEt2 (1.0 eq, 0.42 v) was then added to the solution at a rate that maintained the T below 25 °C. The reaction was added to saturated aqueous sodium bicarbonate (10 v) and the resulting mixture stirred for 15 minutes. The mixture was extracted with heptane (10 v), followed by MTBE (5 v) and the combined extracts were concentrated to provide 3 (calcd. at 0.72 wt) as an orange oil.
Figure imgf000057_0002
[00133] solution of 3 (1 wt) in THF (9 v) was tre with sodium (25% wt/wt in methanol (1.5 eq, 2.2 wt)) at a rate that maintain T below 25 °C. The reaction was quenched by addition to 1 N HCI (10 v). The organic layer was separated and the aqueous was extracted with MTBE (10 v). The combined organics were washed with water (2.5 v), saturated sodium bicarbonate (2.5 v), and water (2.5 v). The solution was concentrated to provide a solution of 4 (calcd. at 0.88 wt) in THF (2.5 v). The solution was used directly in the next step.
Figure imgf000057_0003
[00134] Methanol (5 v) was added to the solution of 4 (1 wt) in tetrahydrofuran (2.5 v). IN HCI (0.75 eq, 2 v) was added and the reaction was warmed to 60-80 °C. The reaction was cooled to rt and added to saturated aqueous bicarbonate. The mixture was extracted with DCM (3 x 2.5 v) and the combined DCM extracts were solvent exchanged with EtOAc to provide a solution of 5 in EtOAc (3 v). Heptane (2 v) was added to induce crystallization and the resulting suspension cooled to 0°C. The solids were collected by filtration and the filter cake washed with cold EtO Ac/heptane (1:1 v/v) and dried to provide 5 (0.55 wt) as a white powder.
Figure imgf000058_0001
[00135] Compound 5 (1 wt) was dissolved in ACN (10 v) then 2-acetoxy-2- methylpropanyl bromide (4.0 eq, 2.2 wt) and water (1 eq, 0.067 wt) were added consecutively. The resulting mixture was stirred at ambient temperature then cooled to 5-10 °C. NaOMe (25% wt/wt in MeOH, 8 eq, 6.2 wt) was added and the reaction allowed to warm to ambient temperature. The reaction was quenched by the addition of saturated sodium bicarbonate (10 v) and extracted with MTBE (2 x 10 v). The solvent was exchanged with methanol by atmospheric distillation to provide a solution of 6 (calcd at 0.91 wt) in methanol (10 v).
Figure imgf000058_0002
[00136] A solution of 6 (1 wt) in methanol (10 v) was heated to 55 °C. Sodium borohydride (5 eq, 0.68 wt) was added in 6 portions and the reaction cooled to 5 °C and quenched with 1 N HCI (10 v). Brine (5 v) was added and the reaction extracted with EtOAc
(2 x 10 v). The extracts were combined and concentrated to provide 7 as a tan residue.
Figure imgf000058_0003
[00137] Compound 7 (1 wt) was dissolved in CH2C12 (10 v) then DMAP (0.1 eq, 0.054 wt), Et3N (3.0 eq, 1.85 v), and TBDPSCI (1.2 eq, 1.38 v) were added at ambient temperature. Sodium bicarbonate (10 v) was added and the organic layer separated. The aqueous layer was extracted again with CH2C12 (10 v), the organic extracts combined and concentrated to provide 8 (calculated at 1.8 wt) as a colorless oil.
Figure imgf000059_0001
8
[00138] LDA (1.5 M in cyclohexane, 4 eq, 6 v) was added to a solution of 9 (1 wt) in THF
(10 v) at ambient temperature. The solution was warmed to 50 °C then quenched with 1 N
HCI (5 v) and extracted with MTBE (10 v). The extracts were concentrated to provide 9 (0.9 wt) as an oil.
Figure imgf000059_0002
[00139] A solution of 9 (1 wt) in CH2C12 (5 v) in MeOH (5 v) was cooled to -60 °C and treated with O3 keeping temperature below -50°C. The reaction was purged with N2, NaBH (0.5 eq, 0.04 wt) was added and the mixture warmed to 0 °C. Additional NaBH4 (1 eq, 0.08 wt) was added in portions and the reaction allowed to warm to ambient temperature. After 3 hours, the mixture was quenched with IN HC1,(10 v), CH2C12 (5 v) was added and the layers were allowed to partition. The aqueous layer was re-extracted with CH2C12 (10 v) and the organic extracts were combined and concentrated to provide 10 (0.97 wt) as a colorless oil.
Figure imgf000059_0003
[00140] Compound 10 was dissolved in THF (10 v) and phosphate buffer (pH=7, 5 v) was added. NaIO4 (2 eq, 0.854 wt) was added and the reaction warmed to ambient temperature.
Water (5 v) and MTBE (10 v) was added and the resulting mixture stirred vigorously for 10 minutes. The organic layer was separated and washed with 10% wt/v aqueous sodium thiosulfate (5 v), water (5 v), and brine (5 v) then dried by azeotropic distillation with THF
(~200 ppm water) to provide a solution of 11 (calcd. at 0.93 wt) in THF (10 v). This solution was used directly in next step.
Figure imgf000060_0001
11 12
[00141] (Carbomethoxymethylene)triphenylphosphorane (1 wt) was added to the solution of 11 (1 wt) in THF (10 v) and heated to 65 °C. Heptane (40 v) was added and the resulting mixture stirred for 30 minutes. The resulting precipitate was filtered and the filtrate concentrated to a total 10 v. SiO2 (5 wt) was added and the suspension filtered over a pad of SiO2 eluting with MTBE (20-40 v). The solvent was exchanged with MeOH to provide a solution of 12 (calcd. at 0.95 wt) in MeOH (10 v) which was used directly in the next step.
Figure imgf000060_0002
12 13
[00142] A solution of 12 (1 wt) in MeOH (10 v) was added to 10% wt/wt Pd(C) (0.23 eq, 0.37 wt) and treated with H2. The suspension was filtered while rinsing the filter cake with THF (10 v). The solvent was exchanged with THF to provide a solution of 13 (calcd. at 0.95 wt) in THF (10 v) which was used directly in next step.
Figure imgf000060_0003
[00143] The solution of 13 (1 wt) in THF (10 v) was cooled to 0-5 °C and LAH (1 M (THF), 0.78 eq, 1.5 v) was added at a rate that maintained the temperature below 10°C. Water (1.7 eq, 0.06 v) was then added at a rate that maintained the temperature below 10°C. NaOH (10% wt/wt in water, 0.16 eq, 0.06 v) was added followed by water (4.98 eq, 0.17 v) at a rate that maintained the temperature below 10°C and the resulting mixture stirred vigorously while wanning to ambient temperature. The suspension was filtered and the filter cake rinsed with THF (5 v). The filtrate was partially concentrated to provide 14 (calcd. at 0.9 wt) in THF (10 v) which was used directly in next step.
Figure imgf000061_0001
14 15
[00144] The solution of 14 (1 wt) in THF (10 v) was cooled to 0 °C then imidazole and TrCI (1.5 eq, 0.59 wt) were added. Saturated aqueous NaHCO3 (5 v) was added and the mixture extracted with heptane (10 v). The extract was washed with brine (10 v) and concentrated to provide 15 (1.35 wt).
Figure imgf000061_0002
[00145] Compound 15 (1 wt) was dissolved in THF (10 v) and treated with TBAF (1M, 1.2 eq, 1.6 v). The reaction mixture was concentrated to 2 v then heptane (5 v) and SiO2 (5 wt) were added. The resulting suspension was filtered and eluted with heptane (5 v) followed by THF (10 v). The THF eluent was collected to provide a solution of 16 (calcd at 0.61 wt) in THF (10 v) which was used directly in the next step.
Figure imgf000061_0003
16 17
[00146] PPh3 (5 eq, 2.3 wt), pyridine (10 eq 1 vol), and NIS (3.0 eq, 1.1 wt) were added to the solution of 16 (1 wt) in THF (10 v). 20 % wt/wt aqueous citric acid (10 eq, 14 wt) was then added and the resulting mixture allowed to stir for 10 minutes. The reaction was diluted with heptane (10 v) and the aqueous layer separated. The organic layer was washed with with water (5 v), 10 % wt/v aqueous sodium thiosulfate (5 v), water (5 v) and brine (5 v). The solvent was exchanged with EtOH and concentrated to 5 v. Water (10 v) was added and the resulting precipitate was collected by filtration to obtain 17 (0.65 wt) as a white solid.
Figure imgf000061_0004
17 18
[00147] Compound 17 (1 wt) and KCN (6 eq, 0.54 wt) were suspended in EtOH (5 v) and water (10 v) and the resulting suspension heated to 80 °C. The reaction was diluted with water (5 v) and EtOAc (10 v) and mixed for 10 minutes. The aqueous layer was removed and the organic layer washed with water (5 v) and brine (5 v). The solvent was exchanged with EtOH to provide 18 (0.75 wt) in EtOH (10 v) which was used directly in next step.
Figure imgf000062_0001
[00148] Zn (37 eq, 3.9 wt) was added to the solution of 18 (1 wt) in EtOH (10 v) and the mixture heated to 75-80°C. The reaction was partially concentrated to 2-3 v, cooled to ambient temperature, and partitioned between MTBE (10 v) and water 5 (v). The aqueous layer was removed and the organic layer washed with saturated bicarbonate (5 v), water (5 v), and brine (5 v), then dried by THF azeotropic distillation to -200 ppm water to provide 19 (0.81 wt) in THF (10 v). The resulting solution was used directly in next step.
Figure imgf000062_0002
[00149] LDA (1.0 M in THF, 1.2 eq, 2.4 v) was added to the solution of 19 (1 wt) in THF (10 v) at -78 °C. The resulting mixture was stirred for 10 minutes then the enolate solution was added to a solution of Mel (1.5 eq, 0.19 v) in THF (5 v) at -78 °C. The reaction was inverse quenched into saturated sodium bicarbonate (10 v) and extracted with MTBE (15 v). The extract was washed with brine (5 v), concentrated, then purified by chromatography to provide 20 (0.86 wt).
Figure imgf000062_0003
[00150] AlMe3 (2 M in toluene, 1.5 eq, 1.5 v) was added to a suspension of dimethylhydroxylamine hydrogen chloride (1 wt) in CH2C12 (2.5 v) at 0 °C. A solution of 20 (1 wt) in CH2C12 (5 v) was added at a rate that maintained the reaction temperature below 5°C. The reaction mixture was then added to aqueous sodium tartrate (1.3 M, 20 v) keeping the temperature below 10 °C. The layers were allowed to partition, were separated, and the organic layer was dried with Na2SO4 (5 wt). The resulting suspension was filtered and the filtrate concentrated. The residue was dissolved in DMF (2 v) then imidazole (0.19 wt) and TBSCI (0.29 wt) were added. The reaction was diluted with water (5 v) and MTBE (10 v) and allowed to stir for 10 minutes. The aqueous layer was removed and the organic layer washed with water (5 v). The extract was added to a solution of aqueous NaOH (IN, 0.78 v) and MeOH (0.7 v). The reaction was allowed to stir then the aqueous layer was removed and the organic washed with brine (2.5 v) then concentrated to provide 21 (1.2 wt).
Figure imgf000063_0001
[00151] Methyl magnesium chloride (3.0 M, 59 wt, 1.2 eq) was added to a solution of 21 (1 wt) in anhydrous THF (1.11 wt, 1.25 v) at a rate that maintained the reaction temperature below 0 °C. After stirring at 0°C, the reaction was reverse quenched into saturated ammonium chloride (2.5 v) and water (2.3 v). The resulting mixture was diluted with MTBE (10 v) and stirred vigorously. The aqueous layer was separated and the organic layer washed with brine (2.5 v) and concentrated to provide 22 (0.84 wt).
Figure imgf000063_0002
[00152] Compound 22 (1 wt) was dissolved in THF (4 v) and cooled to -78 °C. KHMDS (1.5 M in toluene, 1.01 eq, 2.78 wt,) was added while maintaining the temperature below -60 °C. A solution of Tf2NPh (0.62 wt, 1.1 eq) in THF (1.5 v) was added and the reaction warmed to -20°C. Saturated ammonium cliloride (2.5 v), water (2.5 v), and n-heptane (2.5 v) were added and the mixture warmed to ambient temperature. The layers were allowed to partition and the aqueous layer removed. The organic extract was washed with saturated aqueous sodium bicarbonate (3 x 2.5 v) and brine (2.5 v) then concentrated in vacuo to provide 23 (1.1 wt).
Figure imgf000064_0001
ER-806730
[00153] Compound 23 was dissolved in MeOH (2.5 v) and cooled to 15 °C. HCI (5N in IPA, 1.30 eq, 1.18 wt) was added and the resulting solution allowed to warm to 25 °C. The reaction was cooled to 0°C and sodium bicarbonate (3 eq, 0.33 wt) was added. The reaction was stirred for 15 minutes and the resulting precipitate removed by filtration. The filter cake was washed with ACS grade methanol (1 v) and filtrates were combined and concentrated. The crude concentrate was purified by chromatography to provide ER-806730 (24) (0.5 wt).
Example 4a [00154] Example 4a provides an alternate method of preparing compounds of formula A, an intermediate to F 2, using the general scheme set forth at Scheme V above. This method uses ER-812935 as an intermediate as prepared according to Example 3 (compound 4), above.
Figure imgf000064_0002
[00155] ER-812935 (1 wt) was dissolved in THF (10 v) and cooled to 0°C. LAH (1.0 M in THF, 0.70 eq, 2.0 v) was added keeping the temperature below 5°C. While stirring vigorously, excess reagent was quenched with water (0.078 v) keeping the temperature below 5°C. While maintaining the vigorous stirring, NaOH (15% wt/wt in water (0.078 v)) was added followed by water (0.18 v). After adding Celite® (2 wt), the suspension was filtered and the cake rinsed with THF (5 v). The solution of ER-817633 (0.92 wt, calcd. based on 100% conversion) was concentrated to 5 v and used directly in the next stage.
Figure imgf000065_0001
[00156] The previously prepared solution of ER-816961 (1 wt in 5 v THF) was diluted with THF (5 v), cooled to 5 °C and Et3N (3 eq., 0.94 wt) was added. MsCI (1.05 eq, 0.25 v) was added at a rate that maintained the T below 10 °C. The reaction was quenched by addition of water (5 wt). Heptane (8 v) was added and the mixture allowed to partition. The aqueous phase was separated and extracted with MTBE (2 v). The combined organic extracts were washed with saturated sodium bicarbonate (5 v) and water (1.9 v) The organic layer was concentrated and solvent exchanged with EtOH to prepare a solution of ER-818937 (1.23 wt calcd. based on 100% conversion) in EtOH (1 v)which was used directly in the next stage.
Figure imgf000065_0002
[00157] The previously prepared solution of ER-818950 (1 wt in EtOH (0.8 v) is diluted with EtOH (190 proof, 9 v). KCN (3 eq., 0.41 wt) was added and the suspension was heated to 70-80°C. The reaction was cooled to ambient temperature and water (10 v) was added followed by MTBE (10 v). The layers were separated and the aqueous extracted with MTBE (5 v). The combined organics are washed with water (2 v) and saturated brine (4 wt). The extracts were concentrated and used directly in the next stage.
Figure imgf000065_0003
single diastereomer
[00158] ER-818950 was dissolved in acetic acid (5 v) and hydrogen chloride (1.0 M, 1 eq, 3 v) was added and the reaction was stirred at ambient temperature. The reaction was cooled to 0 °C and NaOH (50% wt/wt, 30eq, 7 wt) was added at a rate that maintained the T below 10 °C. The solution was extracted with heptane (2 x 10 vol). The aqueous phase was saturated with NaCl and extracted with ACN (2 x 10 v). The combined ACN extracts were concentrated and solvent exchanged with EtOAc by atmospheric distillation to provide a solution of ER-817664 in EtOAc (3 v). Salts were filtered from the hot solution which was then cooled to 0 °C. The suspension was filtered to provide ER-817664 as a white crystalline solid.
Example 4b
[00159] Example 4b provides an alternate method of preparing compounds of formula F-2 using the general scheme set forth at Schemes Vb and Vc above. This method uses ER- 817664 as an intermediate as prepared according to Example 4a, above.
Figure imgf000066_0001
ER-817664 C15H20BrNO4 c* ° ' / D0 Exact Mass: 357.0576
C13H19N04 Mol. Wt.: 358.2276
Exact Mass: 253.1314 Mol. Wt.: 253.2943
[00160] ER-817664 (1 wt) was dissolved in ACN (10 v), the suspension was cooled to 0°C and 2-acetoxy-2-methylpropanyl bromide (4.0 eq, 2.4 v) was added followed by the addition of H2O (1.0 eq., 0.07 v). The resulting mixture was stirred at 0 °C for 2 hours. NaHCO3 (sat. aqueous, 8.0 eq. 40 v) was added slowly at 0 °C. The resulting mixture was stirred at room temperature for 30 minutes prior to extraction with MTBE (2 x 20 v). The organic layer was washed with brine (5 v) and concentrated to give the product as colorless oil.
Figure imgf000066_0002
ι_ι rMO Cl5r1-|9NU4
Exact Mass- 357.0576 Exact Mass. 277.1314
Mol. Wt.: 358.2276 Mol. Wt.: 277.3157
[00161] The starting bromide (1 wt), depicted immediately above, was dissolved in toluene (10 v). DBU (1.8 eq., 0.73 v) was added and the mixture was heated at 80 °C. The mixture was cooled to room temperature, diluted with MTBE (20 v), and washed with water (5 v) and then brine (5 v). The organic layer was then concentrated to give the product as an off-white powder.
Figure imgf000067_0001
[00162] The starting olefin compound (1 wt), depicted immediately above, was dissolved in CH2C12 (5 v) and MeOH (5 v), and cooled to between -40 °C to -45 °C. The solution was then treated with O3. Excess O3 was removed by N2 purge and the solution was warmed to - 15 °C. NaBH4 (1.0 eq, 0.18 wt) was added and the mixture was warm to 0 °C. K2CO3 (1.3 eq.) was added and the suspension stirred at rt. The reaction was neutralized with IN HCI (~4 eq, -20 v) at 0°C and the solution was extracted with MTBE(10 v) to remove lypophilics. The aqueous layer was concentrated to remove CH2C12 and MeOH. THF (4 v) was added followed by NaIO (2 eq, 2 wt). The reaction was extracted with MTBE (10 v) and n-BuOH (10 v). The combined organic extracts were concentrated and the resulting powder was triturated with EtOAc. After filtration the lactol was isolated as a pale yellow powder.
Figure imgf000067_0002
ER-818638 ER-818640
[00163] ER-818638 (lwt) and LiCI (2.0eq, 0.35 wt) was stirred in ACN (8.7 v). Hunigs base (1.5 eq) was added at 25 °C. 1 N HCI (5 v) was added and the mixture was extracted with MTBE (10 v). The organics were concentrated to provide ER-818640 which was used as is in the next step.
Figure imgf000067_0003
C15H 1NO5 C15H23N05
Exact Mass: 295.142 Exact Mass: 297- 1576
Moi. Wt.: 295.3309 Mol. Wt.: 297.3468
[00164] The starting α-olefin ester compound (1 wt), depicted immediately above, was dissolved in MeOH (10 v) and added to 10 wt% of Pd(C) (0.09 eq,~0.33 wt) under N2. The suspension was then stirred under H2. The suspension was filtered through a Celite® pad (20 wt), rinsing the filter calce with MeOH (20 v). The filtrate was concentrated and purified by flash chromatography to give product as colorless oil (94.3% yield).
Figure imgf000068_0001
C15H23N05 C15H22IN04
Exact Mass: 297.1576 Exact Mass: 407.0594
Mol. Wt.: 297.3468 Mol. Wt.: 407.2439
[00165] Pyridine (10 eq.), Ph3P (7 eq.) and NIS (4 eq.) were added to the solution of the ester (1 wt) in THF (15 v) separately. The reaction mixture was stirred at ambient temperature. Aqueous citric acid (20 wt%, 10 eq) was added and the mixture diluted with TBME (30 v). The aqueous layer was separated and the organic layer washed with water (5 v), aqueous Na2S2O3 (10%> wt/v, (5 v), water (5 v) and brine (5 v). The organic layer was concentrated and purified by flash chromatography to give product as colorless oil.
Figure imgf000068_0002
[00166] The starting iodide (1 wt) was dissolved in MeOH (30 v) and heated to 55°C. NaBH4 (47 eq.) was added in 6 portions at 55 °C over 80 minutes. The reaction was cooled to 0 °C and quenched with IN HCI (30 v). After stirring 5 minutes, the mixture was diluted with brine (30 v) and extracted with DCM (50 v x 2). The organic layer was dried over Na2SO and concentrated. The crude product was used directly in the next step.
Figure imgf000068_0003
[00167] The starting alcohol (1 wt), depicted immediately above, was dissolved in EtOH (70 v) and Zn (165 eq.) was added. The suspension was refluxed at 75-80 °C. The reaction mixture was cooled to ambient temperature and IN HCI (70 v) was added. The mixture was extracted with DCM (3 x 100 v), the organic layer washed with brine and concentrated.
Figure imgf000069_0001
[00168] The starting lactone, as depicted immediately above, was dissolved in DCM (50 v), Et3N (5.0 eq.), DMAP (0.3 eq.) and TBDPSCI (1.5 eq.) were added separately at ambient temperature under N2, and the resulting solution was stirred at ambient temperature for 2-3 hours. Upon the completion of the reaction, the mixture was diluted with TBME (100 v), washed with sat. aq. NaHCO3 solution (10 v), H2O (10 v) and brine (10 v). The organic layer was concentrated and purified by flash chromatography to give the product as colorless oil.
Example 4c
[00169] Example 4c provides another alternate method of preparing compounds of formula F-2 using the general scheme set forth at Scheme VII above. This method uses ER- 811510 as an intermediate as prepared according to Example 3, above where acetone is used instead of cyclohexanone.
Figure imgf000069_0002
[00170] ER-811510 (lwt, 1 eq) was dissolved in methylene chloride (6.3 v) and cooled to -5°C. Pyridine (0.41 vol, 1.1 eq) was added followed by bromoacetyl bromide (0.44 vol, 1.1 eq) while keeping the temperature below 0°C. The reaction was stirred at 1 hour and warmed to room temperature. Water (8 vol) was added and the layers separated. The organic layer was washed sequentially with aqueous copper sulfate pentahydrate (1.0 M, 10 vol), water (8 vol), and brine (10 vol) then dried over magnesium sulfate, filtered and concentrated in vacuo to afford ER-812771 as a tan solid.
Figure imgf000070_0001
[00171] ER-812771 (lwt, 1 eq) was dissolved in acetonitrile (6 v) and triphenylphosphine was added and the reaction heated at 50°C for 45 minutes. The reaction was cooled to -10°C then l,8-diazabicyclo[5.4.0]undec-7-ene (DBU, 0.35 vol, 0.8 eq) was added. The reaction was stirred for 15 minutes, heated to 80°C for 45 minutes then cooled to ambient temperature. Ammonium chloride (saturated aqueous, 10 vol) was added and the aqueous layer extracted with ethyl acetate (3 x 10 v). The combined organic layers were dried over magnesium sulfate and concentrated in vacuo. The crude product was purified by chromatography to afford ER-812772 as a white solid.
Figure imgf000070_0002
[00172] ER-812772 (lwt, 1 eq) was dissolved in ethyl acetate (8 v). 10% Palladium on carbon (0.05 wt, 0.01 eq) was added, the reaction purged with nitrogen then stirred under hydrogen atmosphere for 2 hours. The catalyst was removed by filtration through Celite with ethyl acetate washed. The combined filtrates were concentrated in vacuo to afford ER- 812829 as a white solid.
Example 5
Preparation of F-3a:
cyclohexanone
Figure imgf000071_0002
p-TSA, toluene
Figure imgf000071_0001
ER-805813 ER-805715
[00173] D-Gulonolactone (1 wt., 1 eq.), cyclohexanone (2 to 3 eq.), toluene (6 vol.), and p-toluenesulfonic acid (0.021 wt., 0.02 eq.) were charged to the reaction vessel. Reaction mixture was heated to reflux with stirring. Upon azeotropic removal of water the reaction was complete. The reaction mixture was cooled to 85 to 90°C and agitation was increased. Heptane (5.2 vol.) was added over 20-30 minutes with stirring. Cooled to 65-70°C and stirred for 30 minutes at 65-70°C. The solid product was filtered at 65-70°C, maintaining mother liquor temp > 35 °C. Re-filtered at 35-40°C and maintained the mother liquor at ambient temperature for 30 minutes. Re-filtered the mother liquor. The filter cake was washed two times with heptane (2 x 1.7 vol.) then dried to afford ER-805715. Yield 84% (1.6 wt).
[00174] In an alternate method for preparing ER-805715, D-gulonolactone (1 wt), cyclohexanone (1.32 wt, 2.4 eq), p-TsOH-monohydrate (0.02 wt, 0.02 eq) and toluene (12 vol) were refluxed together for 19 hours, while azeotropically removing water. The mixture was washed with 5% aqueous NaHCO3 (4 vol) followed by saturated aqueous NaCl (2 vol x 2, pH:=7). The organic phase was concentrated by distillation (ca. 4.5 vol of toluene remaining) and cooled to 100 °C before heptane (10 vol) was added, maintaining internal temperature > 80 °C. The mixture was heated to reflux for at least 1 hour before it was cooled to and aged at 85 °C for 3 hours, at 80 °C for 3 hrs and then cooled to 40 °C in 12 hrs. The product was collected by filtration and the calce washed with heptane (2 vol). The filter calce was dried by airflow to afford ER-805715 (1.48 wt) in 78% of yield.
Figure imgf000072_0001
ER-805715 ER-805814
[00175] ER-805715 (1 wt., 1 eq.) was charged to reaction vessel and dissolved in anhydrous THF (3.34 vol.) and anhydrous toluene (2.5 vol.). The mixture was cooled to -15 to -10 °C. DIBALH (1.5M in toluene, 2.4 vol., 1.2 eq.) was added over 1 hour and the mixture stirred for 15-30 minutes at -15 to -10 °C. The reaction was inverse quenched into KNa-Tartrate solution (1 wt. KNa Tartrate in 2.9 wt. water) at 10°C and the resulting mixture allowed to warm to room temperature and stir for 4 hours. The mixture was filtered then the layers separated and extracted with MTBE (2 vol.). The organic layers were combined and the solvents removed in vacuo to afford ER-805814. Yield 100%, (1.02 wt.).
Figure imgf000072_0002
ER-805814 ER-805815
[00176] ER 805814 (1 wt.) was dissolved in anhydrous THF (3.3 vol.) and treated with (methoxymethyl)triphenylphosphonium chloride (2.11 wt., 2.1 eq.). The reaction mixture was heated to 28-32 °C then a solution of KOtBu (0.66 wt., 2 eq.) in anhydrous THF (2.64 vol.) was added over 100-140 minutes, maintaining reaction temperature 30-35 °C. After 5 hours, the reaction was cooled to 20-25 °C, MTBE (5.11 vol.) was added and the mixture stirred. Brine (3 wt.) and water (3 wt.) were added (exothermic at start of addition, controlled by bath @ 20-25°C). Organic layer was separated and treated with a solution of maleic anhydride (0.27 wt.) in MTBE/THF (1/1 v/v, 1.78 vol.). NaOH solution (0.088 wt. in 2.5 vol. water) was added slowly to the reaction mixture. The organic layer was concentrated to give crude ER 805815 (0.985 wt.). The residue was triturated three times with MTBE/heptane (1/4 v/v, 6.6 vol.). The extract was filtered through SiO2 (3 wt), eluting with MTBE/heptane (1/2 v/v, 45 vol.). The filtrate was concentrated to give ER-805815 (0.88 wt., 81% yield). [00177] In an alternate method for preparing ER-805815, a solution of t-BuOK (0.989 wt, 3 eq) in THF (4 wt) was added to a suspension of (methoxymethyl)triphenylphosphonium chloride (3.12 wt, 3.1 eq) in THF (1.78 wt), maintaining the reaction temperature between 0- 10 °C. The addition vessel was rinsed with THF (2 x 0.7 wt). A solution of ER-805814 (1 wt, 1 eq) in THF (1.42 wt) was added to the reaction, maintaining 0-10 °C. The addition vessel was rinsed with THF (2 x 0.7 wt). The mixture was stirred at 20-30 °C overnight and 30-35 °C for 3 hours. The reaction was cooled below 30 °C and diluted with MTBE (3.7 wt) followed by 10 wt% aqueous NaCl (4 wt) solution. The mixture was stirred for 30 minutes and the layers were separated. Maleic anhydride (0.63 wt, 2.2 eq) was added and the mixture stirred at room temperature for 30 minutes. Water (6 wt) and a solution of NaOH (48 wt%, 0.64 wt, 2.6 eq) was added dropwise, maintaining the reaction below 15 °C. After stirring below 15 °C, the lower layer was separated. Water (6 wt) was added followed by a solution of NaOH (48 wt%, 0.64 wt, 2.6 eq), keeping the mixture below 15 °C during the addition. After stirring below 15 °C, the lower layer was separated. The organic layer was washed three times with a 15 wt%> aqueous NaCl solution (3 x 4 wt). The organic layer was concentrated in vacuo. The residue was diluted with MTBE (1 wt) and concentrated in vacuo. The residue was diluted dropwise with IPE (3 wt) at 40-50 °C over 30 minutes. The suspension was stirred for 1 hour at 40-50 °C and slowly cooled to 0-10 °C and stirred for 1 hour. The solids were filtered and the calce washed with IPE (2 wt). The filtrate and washings were concentrated in vacuo. The residue was treated with MeOH (2.37 wt) and water (0.4 wt) and extracted with heptane (2.74 wt). The lower layer was extracted 9 times with heptane (2.05 wt). The extracted solutions were combined and concentrated in vacuo to give ER-805815 (1.07 wt, 98.6%).
[00178] In an alternative method for worlcup of ER-805815, the crude organic layer that is produced following brine wash and concentration is treated with MTBE (2.86 wt) and celite (0.5 wt). After stirring for 2.5 h, heptane (1.46 wt) was added over 2 hrs and the mixture stirred overnight. The precipitate was filtered. The filter calce was washed with MTBE/Heptane (1 :1) (5 wt). The filtrate was concentrated in vacuo until the volume was decreased to about 3 volume. The residue was dissolved in MeOH (2 wts) and H2O (6 wts). The mixture was extracted with heptane/MTBE (5:1) (3*6 wts). The organic layer was separated and concentrated to provide ER-805815 which was used as is for the following step.
Figure imgf000074_0001
ER-805815 ER-805816
[00179] ER-805815 (1 wt) was dissolved in acetone (2.4 vol) and water (0.4 vol). N-Methylmorpholine N-oxide (0.62 wt, 2 eq) was added and the mixture cooled to 0-5 °C. OsO4 (0.15M in water, 0.065 vol) was added and the reaction was maintained at 0-5 °C. The reaction mixture was stirred at 0-5 °C for 12 hours. Water (0.2 vol) was added over 1 hour at 0-2°C. The mixture was stirred for one hour at 0-5 °C. The product was filtered and the solids washed twice with pre-cooled (0-5 °C) acetone/water (1/1, v/v, 2 x 0.7 vol). The product was dried to afford ER-805816 (0.526 wt, 52% yield, residual Os <17 ppm). [00180] In an alternate method for preparing ER-805816, a solution of ER-805815 (1 wt, 1 eq) in acetone (4 wt) was charged into a four-necked flask, then water (0.5 wt) was added at ambient temperature. To the mixture was added anhydrous N-methylmorpholine-N-oxide (0.38 wt, 1.2 eq). Potassium osmate dihydrate (0.003 wt, 0.003 eq) was added portion- wise at 25 to 35 °C while cooling with water. The mixture was kept at this temperature for 4 hours. A solution of sodium thiosulfate 0.075 wt, 0.49 eq) in water (0.5 wt) was added at ambient temperature, then the mixture was stirred for 0.5 hour. The mixture was cooled to 0-5 °C and stirred for 2 hours. The resulting precipitate was collected and the wet calce was washed with methanol (0.6 wt) and water (1.5 wt) to obtain the crude product (1.25 wt). The crude product sample was dried (0.611 wt). The crude ER-805816 (1.25 wt) was added to water (3.05 wt) and stirred for 2 hours at about 25 °C. The precipitate was filtered and washed with water (1.53 wt) to afford the crude wet calce (1.05 wt). The crude product sample was dried and sampled, ICP Os = 37 ppm. The crude ER-805816 (1.05 wt) was added to water (2.81 wt) and stirred for 2 hours at about 25 °C. The precipitate was filtered and washed with water (1.4 wt) and methanol (0.45 wt) to afford the crude ER-805816 (0.736 wt). The wet cake was dried crude product (0.56 wt, ICP (Os) = 28 ppm). ER-805816 (0.56 wt) was dissolved in acetone (1.76 wt) at 45 to 55°C. To the solution was added active carbon (0.027 wt) and stirred at same temperature for 0.5 hour. The mixture was filtered and the calce was washed with hot acetone (0.214 wt). The filtrate was kept at 45 to 50°C and water (0.83 wt) was added over 10 minutes and temperature was kept at 40 to 50°C during water addition. The mixture was cooled to 0 to 5 °C and stirred for 1.5 hours. The white precipitate was filtered and washed with a solution of acetone (0.17 wt) and water (0.22 wt) then dried to give ER-805816 (0.508 wt, 0.49 eq, KF 5.0%, ICP (Os) 9.6 ppm).
Figure imgf000075_0001
[00181] ER-805816 (1 wt) was slurried in acetic acid (0.89 vol, 5.8 eq) and acetic anhydride (3.57 wt, 13 eq). Anhydrous ZnCl2 (0.2 wt, 0.54 eq) was added. Reaction mixture was stirred for 24 hours 18-22 °C. Reaction was quenched into ice (5 wt) and water (5 vol). EtOAc (10 vol) was added with stirring and the aqueous layer is separated. The aqueous layer was back extracted with EtOAc (10 vol). The combined organic layers were washed sequentially with brine (10 vol), 5% aqueous NaOAc (6 vol), and brine (6 vol). The organic layer was concentrated. The crude concentrate was dissolved in 25% EtO Ac/hex (4 vol) and filtered through SiO2. The pad was washed with 25% EtO Ac/hex (2 x 12 vol) and further 25% EtOAc/hex (48 vol). The organic layer was concentrated to give ER-805819 (1 wt, 81%).
[00182] In an alternate method for preparing ER-805819, zinc chloride (0.2 wt, 0.54 eq), acetic anhydride (2.75 wt, 10 eq), and acetic acid (1 wt, 6 eq) were combined. The mixture was cooled to 15-20 °C. ER-805816 (1 wt, 1 eq) was added, maintaining the internal temperature at 15 to 30 °C. The mixture was then stirred at 35-40 °C for 6 hows. The reaction mixture was cooled below 25 °C. Methanol (3.2 wt, 4 vol) was added drop-wise maintaining reaction temperature below 25 °C. Heptane (2.7 wt, 4 vol) was added. Water was added (4 wt, 4 vol) maintaining reaction temperature below 25 °C. The mixture was stirred for 15 minutes, and then the phases were separated. The lower layer was washed twice with heptane (2.7 wt, 4 vol) and the heptane layers were discarded. The lower layer was extracted twice with toluene (6.1 wt, 8 vol). The combined toluene layers were washed twice with 17 wt % potassium bicarbonate aqueous solution (0.82 wt KHCO3 in 3.98 wt water, 4.36 vol), twice with water (4 wt), and concentrated. Methanol (3.95 wt, 5 vol) was added at 25-30 °C and the mixture stirred for 10 minutes. Water (0.3 wt) was added at 25-30 °C. The mixture was cooled to 0 °C and seeded. The mixture was stirred at 0 °C for 1 hour. Water (0.7 wt) was added drop-wise over 1 hour. Water (4 wt) was added drop-wise over 1 hour. The resulting precipitated solids were filtered, and the filter cake washed twice with a 0 °C methanol (1.03 wt) and water (0.7 wt) solution. The cake was dried to afford ER-805819 (0.99wt, 0.84 eq).
Figure imgf000076_0001
ER-805819 ER-805821
[00183] ER-805819 (1 wt) was dissolved in anhydrous acetonitrile (15 vol) and treated with ER-803055 (0.93 vol, 2 eq). The reaction mixture was cooled to 0 -5°C and BF3-OEt2 (0.54 vol, 1.95 eq) was added over 5 minutes, maintaining reaction temperature between 0-5 °C. Reaction mixture was stirred 0-5 °C for 12 hours. Reaction was quenched into saturated sodium bicarbonate (20 vol) with vigorous stirring. Extracted twice with EtOAc (2 x 8 vol). The combined organics were washed with brine (12 vol) and concentrated to give ER- 805821 (1 wt, 88% yield, use as is).
[00184] In an alternate method for preparing ER-805821, ER 805819 (1 wt, 1 eq) and ER 803055 (0.93 vol, 2 eq) were dissolved in anhydrous acetonitrile (5.46 wt, 7 vol). The reaction mixture was cooled to 0-5 °C and BF3-OEt2 (0.54 vol, 1.95 eq) was added over 5 minutes, while maintaining reaction temperature between 0-5 °C. The reaction mixture was stirred at 0-5 °C for 20 hours then heptane (5.47 wt, 8 vol) was added at 0-5 °C. The phases were separated and the lower layer treated with heptane (5.47 wt, 8 vol) at 0-5 °C. The reaction was quenched by dropwise addition of 7.4% potassium bicarbonate aqueous solution (0.64 wt KHCO3 and 8 wt water), while maintaining the reaction temperature at 0-15 °C. Toluene (8.65 wt, 10 vol) was added and the mixture stirred for 30 minutes. The lower layer was separated and the upper organic layer washed twice with water (10 vol) and concentrated to afford ER-805821 as a crude oil (1.05 wt, 0.935 eq). Base, Solvent '
Figure imgf000077_0002
Figure imgf000077_0001
ER-805821 ER-805822
[00185] ER-805821 (1 wt) was dissolved in anhydrous THF (8.4 vol) and anhydrous MeO Ac (2 vol). Triton B(OH) (3.6 vol) was added over 2 minutes, reaction maintained 17- 23 °C. Reaction was stirred for 1.5 hour. Reaction mixture was filteredwt. The filtrate was concentrated and passed through a pad of SiO2 (5 wt, EtOAc, 20 vol). The filtrate was washed with brine (2.2 vol) and evaporated to give ER-805822 (0.54 wt, 72% yield). [00186] In an alternate method for preparing ER-805822, ER-805821 (1 wt, 1 eq, 11.18 g, 21.81 mmol) was dissolved in anhydrous MTBE (4.4 wt, 6 vol.) and cooled to 0-5 °C. NaOMe (28wt% in MeOH, 0.564 wt, 1.5 eq) was added to the mixture over 1 hour at 0-5 °C and stirred for 3 hour at same temperature range. The reaction was quenched by addition of acetic acid (0.188 wt, 1.6 eq.), maintaining 0-5 °C during addition. The mixture was stirred overnight then treated with a 5 wt % aqueous solution of KHCO3 (3 wt) and ethyl acetate (3.6 wt, 4 vol) at 0 -5°C, and then stirred for 15 minutes. After phase separation, the lower layer was extracted with ethyl acetate (3.6 wt, 4 vol) twice. The combined organic layer was concentrated. To the residue was added acetone (2 wt, 2.5 vol) and IPE (2 wt, 2.7 vol) and stirred overnight at 0-5 °C. The mixture was filtered through Celite® (0.25 wt) and washed with acetone (2 wt). The filtrate was concentrated to afford the crude oil (0.55 wt). To the residue was added acetone (0.2 wt, 0.25 vol.) and IPE (0.54 wt, 0.75 vol.) and stirred for 1 hour at 40-50 °C. The solution was seeded with ER-805822 at room temperature and stirred overnight at room temperature. To the suspension was added IPE (1.27 wt, 1.75 vol.) over 2 hours at room temperature. After stirring for 5 hours at room temperature, the precipitate was collected by filtration, and the cake washed with acetone/IPE (1/10) (2 vol.). The obtained cake was dried in a tray-type chamber at 30-40 °C overnight to afford the desired product ER-805822 (0.286 wt, 0.38 eq) in 38.0 % yield from ER-805819.
[00187] In an alternative method for worlcup of crude ER-805822, the residue following concentration of the final EtOAc solution was dissolved in IPA (2 wt) and the solution was heated to 50 °C. Heptane (5 wts) was added and the mixture was cooled to 20 °C and seeded. The mixture was stirred at 20 °C overnight. Heptane (10 wts) was added and the mixture was cooled to -5 °C in 30 min and stirred at -5 °C for 5 hrs. The mixture was filtered and the filter cake was washed with heptane (2 wts). The filter calce was dried with air flow under vacuum to provide ER-805822 (60%).
Figure imgf000078_0001
Methyl Ester Diol Aldehyde ER-805822 ER-804697
[00188] ER 805822 (1 wt) was dissolved in ethyl acetate or another appropriate solvent (5 vol) and water (5 vol). NaIO4 (0.58 wt, 1.05 eq) is added portionwise over 30 min to 1 hour, maintaining reaction temperature 0-10 °C. Reaction is stirred for up to 2 hours. The reaction mixture was treated with NaCl (1 wt) and stirred for 30 min at 0 to 10 °C. The reaction mixture was filtered and the cake is rinsed with with ethyl acetate (2 vol). The phases were separated and the lower layer extracted with EtOAc (5 vol) three times. The combined organic layer was washed with 20% aqueous NaCl (5 wt). The organic layer was concentrated to give ER 804697 (1 wt). The residue was dissolved in toluene (2 vol) and the solution concentrated. The residue was dissolved in acetonitrile (7 vol) and used for the next step.
Figure imgf000078_0002
Aldehyde Vinyl Silane ER-804697 ER-804698
[00189] NiCl2 (0.025 wt) and CrCl2 (2.5 wt) were charged to reaction vessel under inert atmosphere. Anhydrous dichloromethane (5 vol) was charged. Stirring was initiated and the mixture was cooled to 0-3 °C. Anl ydrous DMSO (6.7 vol) was added with vigorous stirring over 45 minutes, maintaining temperature below 20 °C. ER-804697 (1 wt) was dissolved in anhydrous dichloromethane (1 vol) and charged to the reaction vessel. The resulting mixture was warmed to 25 °C and ER-806643 (2.58 wt) was added neat over 20 minutes. The reaction temperature was maintained below 45 °C. The reaction was stirred for 30 minutes at 25-35 °C following complete addition. Methanol (5 vol) was added and the miture was stirred for 10 minutes. MTBE (33 vol) was charged and the slurry transferred into IN HCI (25 vol) and water (10 vol). The mixture was stirred for 5 minutes. The aqueous layer was back extracted with MTBE (10 vol) and the combined organics washed sequentially with 0.2N HCI (17 vol), twice with 1% NaCl solution (2 x 17 vol), and brine (13 vol). The organic layer was concentrated and purified (SiO2, 25 wt, 10 column vol EtO Ac/Hex 1/3.5 v/v) to give ER-804698 (0.53 wt, 61%).
[00190] In an alternate method, this reaction was performed in the presence of the chiral ligand ER-807363 in a manner substantially similar to that described for the preparation of ER-118047, infra.
[00191] In an alternate method for preparing ER-804698, DMSO (7 vol.) and MeCN (7 vol) were degassed and cooled to 0-10 °C. The solution was treated portionwise with CrCl2 (10 eq, 3.47 wt) and NiCl (0.1 eq, 0.037 wt) such that the internal temperature did not exceed 20 °C. A solution of ER-804697 (1 wt, 1 eq) in MeCN (7 vol) and ER-806643 (5 eq, 2.5 wt) were added dropwise at 0-10 °C, not allowing the internal temperature to exceed 15 °C. The reaction mixture was stirred at 5 -15°C overnight. To the mixture was added methanol (5.5 wt), water (7 wts), and MTBE (5.2 wts). The reaction was stirred for 1 hour and the lower layer was separated (layer 1). To the upper layer was added a premixed solution of NaCl (1.5 wts) and water (13.5 wts). The mixture was stirred for 1 hour and the lower layer was separated (layer 2). To the upper layer was added heptane (4.8 wts), methanol (2.8 wts), and a premixed solution of NaCl (1.5 wts) and water (13.5 wts). The mixture was stirred for 1 hour and the lower layer was separated (layer 3). The upper layer was drained and saved (organic 1). The reactor was charged with layer 1, methanol (2.8 wts), and MTBE (2.8 wts). The mixture was stirred overnight. The lower layer was separated and discarded. The upper layer was treated with layer 2. The mixture was stirred for 1 hour and the lower layer was separated and discarded. The upper layer was treated with layer 3 and heptane (4.8 wts). The mixture was stirred for 1 hour and the lower layer was separated and discarded. The upper layer was drained and saved (organic 2). The reactor was charged with layer 3, MTBE (0.8 wts), and heptane (2.7 wts). The mixture was stirred for 1 hour and the lower layers was separated and discarded. The upper layer was combined with organic 1 and organic 2. The combined organics were filtered and concentrated at reduced pressure to afford the crude ER-804698 which was purified by chromatography (SiO2, 25 wt, 10 column vol EtO Ac/Hex 1/3.5 v/v ) to give ER-804698 (0.67 wt, 57% yield). [00192] In an alternate method of preparation of ER-804698, the crude material is taken directly to the next step without purification.
AcOH, water
Figure imgf000080_0001
Figure imgf000080_0002
ER-804698 ER-807023
[00193] ER 804698 (1 wt, 1 eq) was treated with AcOH (4.2 wts) and water (4.2 wts). The mixture was heated to 90-97 °C for 100 min. The mixture was cooled to below 15 °C then washed with heptane (2 x 2.7 wts) twice below 15 °C. After phase separation, a mixture of 20wt% aqueous KHCO3 solution (7.7 wts, 35 eq) and MTBE (5.95 wts) was added dropwise to the lower layer such that temperature does not exceed 15 °C. After phase separation the upper layer was washed successively with 5wt%> aqueous KHCO3 solution (0.2 wts), and twice with 5wt%» aqueous NaCl solution (2 x 0.2 wts). The organic layer was concentrated under reduced pressure and MTBE (1.49 wts) was added. The mixture was heated to 55 °C and stirred until dissolved. Heptane (1.00 wts) was added to the solution and the solution was cooled to 40-45 °C. Additional heptane (4.47 wts) was added to the solution and the solution was cooled to 5-15 °C and then stirred overnight. The crystals were filtered and rinsed with heptane to provide ER-807023 (0.58 wts, 71% yield).
Figure imgf000080_0003
[00194] ER-807023 (1 wt, 1 eq) and MTBE (7.43 wts) were charged to a reactor under a nitrogen atmosphere. To the reaction was added 2,6-lutidine (2.15 wts, 7.5 eq). To the mixture was added dropwise TBSOTf (2.47 wts, 3.5 eq) at 0 °C. The reaction mixture was stirred for 30 min at 0-10 °C, then warmed to 23 °C over 1 hr and held at 23 °C for 16 hrs. MeOH (0.21 wts, 2.5 eq.) and water (14.8 wts) were added dropwise sequentially to the reaction mixture, maintaining temperature below 30 °C. After phase separation, the upper layer was washed with IN aqueous hydrochloric acid (16.2 wts), 5%> NaCl aq. (14.8 wts), 5% NaHCO3 aq. (14.8 wts), 5% NaCl aq. (14.8 wts), and 5% NaCl aq. (14.8 wts), respectively. The upper organic layer was concentrated by distillation under reduced pressure to afford the crude ER-804699. MeOH (7.91 wts) was added and the mixture was heated to 50 °C for 30 min. The mixture was cooled to 0 °C over 5 h, and then stirred overnight at 0 °C. The solid was filtered, and the calce was washed with cold MeOH (4 wts) and dried to yield ER 804699 (1.42 wts, 74% yield).
Figure imgf000081_0001
ER-804699 ER-803895
[00195] Into a reactor under a nitrogen atmosphere was charged a solution of ER-804699 (1 wt, 1 eq) in toluene (2.60 wts). Acetonitrile (4.72 wts) was added. TBSCI (0.011 wts, 0.05 eq) was added. The reaction mixture was warmed to 30 °C and the NIS was added (1.25 wts, 4 eq). The reaction mixture was stirred at 22 hrs at 30 °C. The reaction was cooled to 25 °C and the mixture of aqueous sodium thiosulfate and sodium bicarbonate (10.35 wts) were added over 10 minutes keeping the internal temperature below 30 °C. The reaction was stirred for 30 minutes at 25 °C. The aqueous layer was separated. The upper layer was washed twice with 10% NaCl (aq) (2 x 9.9 wts). The organic layer was concentrated under reduced pressure to give crude ER-803895 that was purified using silica gel chromatography to provide ER-803895 (0.96 wt, 89.5% yield).
Example 6 Assembly of F-la. F-2a, and F-3a and Preparation of B-1939:
A. Preparation of(R) or (S) N-[2-(4-Isopropyl-4,5-dihydro-oxazol-2-yl)-6-methyl- phenylj-methanesulfonamide:
Figure imgf000082_0001
ER-807244 ER-807245
[00196] A pre-dried glass lined reactor was charged with triphosgene (1 wt., 1 eq.) and anhydrous THF (2 vol.) and was cooled to an internal temperature of -10 °C. A second pre- dried glass lined was charged with ER-807244 (1.27 wt., 2.5 eq.) and anhydrous THF (3 vol.) then cooled to an internal temperature of -10 °C. The contents of the first reactor were transferred into the second reactor at a rate such that internal temperature did not exceed 15 °C. After complete addition, the reaction was stirred at an internal temperature of 0°C for 1 hour and then gradually warmed to 25°C. A sparge of nitrogen was used for 18 hours to scrub away excess phosgene with trapping of the off-gases through a 2 N NaOH solution. MTBE (3 vol.) was added and the solvent removed by distillation under N2 purge at 40° to 46°C, adding more MTBE as needed. Upon complete removal of the phosgene, the mixture was cooled to an internal temperature of 5° to 10°C and the solution filtered with MTBE (3 vol.) washes to yield ER-807245 (1.12 wt., 0.97 eq.) as a white crystalline solid.
Figure imgf000082_0002
ER-806628 (D-valinol) ER-808056 (L-valinol)
[00197] Into a pre-dried and inerted reactor 1, was added ER-807245 (1 wt., 1 eq.) and anhydrous DMF (4 vol.). With stirring, the mixture was heated to an internal temperature of 95° C. D or L-Valinol (1.05 eq., 0.61 wt.) was dissolved in anhydrous (DMF 1.3 vol.) in reactor 2 with heating to an internal temperature of 90°C. The contents of reactor 2 were transferred into reactor 1 at internal temperature 90°C. CO2 evolution was be observed and the reaction was vented with a N2 bleed. The reaction solution was stirred at 90° C for 3 hours and then cooled to an internal temperature of 65° C. Then, an aqueous slurry of lithium hydroxide (0.47 wt., 2 eq.) in water (2 vol.) was added to reactor 1 and the suspension stirred at an internal temperature of 65°C for 1 hour. The reactor was charged with water (5 vol.) cooled to an internal temperature of ~5 °C over 3 hours. The mixture was stirred for 8 hours at internal temperature ~5° C and the desired product collected by filtration with water (2 X 4 vol.) washes followed by n-heptane (2 X 3 vol.). The product was dried under vacuum and N2 flow at 35° C for 24 hours or until KF < 250 ppm to yield ER-806628 or ER-808056 (0.80 wt., 0.60 eq.) as a crystalline solid.
Figure imgf000083_0001
c^ Sonc !5 ER-806629 (R)
ER-808056 (S) ER-807363 (S)
[00198] A pre-dried and inerted reactor under nitrogen was charged with ER-806628 or
ER-808056 (1 wt., 1 eq.), pyridine (3 wt., 11.4 eq.) and DMAP (0.03 wt., 0.05 eq.). The reaction was cooled to an internal temperature of-10°C then methanesulfonyl chloride (1.46 wt., 3 eq.) was added at a rate such that internal temperature was below 15°C. Upon complete addition, the reaction was stirred at an internal temperature of 0-15 °C for 1 hour and then slowly warmed to 25°C over 2 hours. MTBE (2.6 vol.), was added followed by process water (2 vol.) at a rate such that the internal temperature did not exceed 35°C. The biphasic mixture was titrated with 6N hydrochloric acid, (~1.9 vol.) portion-wise until the pH of the aqueous layer = ~ 3 to 5. If pH went under 3, 30% (w/w) aqueous solution of Na2CO3 was added to back titrate to the desired pH. The phases were allowed to partition and the aqueous phase separated. All organics were combined with water (0.7 vol.) and the aqueous phase discarded. The MTBE was distilled to a level of ~2 vol. at atmosphere pressure to constant bp 55°C and KF < 500 ppm. Additional MTBE was added if necessary. The solution was cooled to an internal temperature of 5-10 °C with seeding when necessary to induce crystallization. n-Heptane (0.5 vol.) was added and the mixture stirred for 18 hours at
5°C. ER-806629 or ER-807363 was collected by filtration with n-heptane (2 X 3 vol.) washes. A second crop of crystals was obtained by concentration of the filtrates to Vi volume and cooling to 0°C. The filter cake was dried under N2 for 18 hours. The crude weighted ER-806629 was charged into a pre-dried reactor and MTBE (3 vol.) was added. The resulting mixture was heated to an internal temperature of 45-50°C for 45 minutes and then slowly cooled to 5°C over 3 hours, with seeding when necessary. n-Heptane (0.5 vol.) was added and the mixture stirred for 18 hours at an internal temperature of 5 °C. The solid product was collected via filtration and n-heptane (2 X 3 vol.) washes then dried under vacuum at 35°C for 24 hours to yield ER-806629 or ER-807363 (1.7 wt., 0.57 eq.) as a crystalline solid.
B. Assembly of F-la andF-2a and Intramolecular Ether Formation:
Figure imgf000084_0001
[00199] An appropriately sized reactor 1 was charged with ER-807363 (1.82 wt, 3.55 eq) and the atmosphere was exchanged for nitrogen. Anhydrous THF (15 vol) was added. In reactor 2, ER-806067 (F-la, 1.14 wt, 1.1 eq) and ER-805973 (F-2a, 1 wt, 1 eq) were combined and dissolved in anhydrous THF (6.3 vol). With stirring, both reactors were sparged with nitrogen for 30-45 minutes. Under an inert atmosphere, reactor 2 was charged with CrCl2 (0.75 wt, 3.55 eq) and then heated to an internal temperature of 30°C. Reactor 2 was charged with triethylamine (0.62 wt, 3.55 eq) at a rate such that internal temperature did not exceed 45 °C. After complete addition, an internal temperature of 30 °C was maintained for 1 hour. After 1 hour, reactor 2 was cooled to 0 °C and charged in an inert fashion with NiCl2 (0.02 wt, 0.1 eq), followed by the contents of reactor 1 and the reaction was warmed to rt. Reactor 2 was cooled to an internal temperature of 0°C and then ethylenediamine (1.2 vol, 10 eq) was added at a rate such that the internal temperature did not exceed 10 °C. Note: An exotherm was observed. The reaction was stirred for 1 hour, and then water (8 vol) and n- heptane (20 vol) were added and the biphasic mixture stirred for 4 minutes and the layers allowed to partition. The organic layer was separated and the aqueous layer back extracted with MTBE (20 vol). The combined organic layers were concentrated in vacuo to a crude oil followed by an azeotrope with anhydrous THF (2 x 10.5 vol). The crude product was dissolved in anhydrous THF (4.5 vol) and then stored at -20 °C until utilization in the next stage.
Figure imgf000085_0001
ER-808227 ER-806746 ER-804027
[00200] The ER-808227 / THF solution from the previous step was analyzed via KF analysis. If KF< 1000 ppm, then proceeded. If KF > 1000 ppm, azeotroped in vacuo with anhydrous THF (4.1 vol.). Repeated azeotrope until specification was met. The final solution meeting specifications contained the dissolved crude ER-808227 in anhydrous THF (4.1 vol.). Once the specification was met, an appropriately sized inerted reactor was charged with anhydrous THF (106 vol.) and the ER-808227 / THF solution from the previous step. The reactor was cooled to an internal temperature of -15 to -20 °C, then 0.5 M KHMDS in toluene (9.1 wt., 3.0 eq.) was added at a rate such that internal temperature did not exceed - 12 °C. Approximately 4.5 eq. KHMDS was necessary to drive the reaction to completion. The reaction was reverse quenched into semi-saturated ammonium chloride (40 vol.) at an internal temperature of 0 °C. n-Heptane (80 vol.) was added, stirred for 2-5 minutes, and then allowed to partition. The organic layer was separated, the aqueous layer was back extracted with MTBE (70 vol.), then the organic layers were combined and washed with saturated sodium chloride solution (70 vol.). The organic layer was separated and concentrated in vacuo. To the crude concentrate was added n-heptane (60 vol.). Note: ER- 808373 precipitated out of solution. The resulting suspension was filtered and the solids washed with n-heptane (20 vol.). The filtrate was concentrated in vacuo to afford crude ER- 806746 (~4 wt.) as a brown oil: Note: When additional ER-807363 precipitated out of solution, the filtration process was repeated. The crude ER-806746 was purified via SiO2 column chromatography to yield ER-804027 (1.16 wt., 0.55 eq.) as a clear yellowish oil. The chromatography was performed as follows: the column was first flushed with sufficient MTBE to remove water then flushed with heptane to remove the MTBE. The ER-806746 was loaded onto the column as a solution in heptane then eluted from the column with heptane/MTBE (5:1) then heptane/MTBE (4:1) with the fractions monitored at 230 nm by UV detector.
Figure imgf000086_0001
ER-804027 ER-804028
[00201] A reactor was charged with ER-804027 (1 wt, 1 eq) and anhydrous dichloromethane (7.6 vol). The reactor was cooled to an internal temperature of -78 °C and then 1 M DibalH in dichloromethane (3.0 wt, 2.25 eq) was added at a rate such that internal temperature did not exceed -60 °C. Methanol (0.1 vol) was added at a rate such that internal temperature did not exceed -60 °C. Note: hydrogen gas evolved and was diluted with a stream of nitrogen. Upon complete addition, the mixture was warmed to ambient temperature and then 1 N hydrochloric acid (10.6 vol) and MTBE (25 vol) were added. The mixture was stirred for 20 minutes and the layers allowed to paitition. The organic layer was separated and the aqueous layer back extracted layer with MTBE (15.3 vol). The organic layers were combined and washed with water (3 vol), saturated sodium bicarbonate (3 vol), and saturated sodium chloride (3 vol), respectively, then concentrated in vacuo. The crude concentrate was purified via SiO2 column chromatography to yield ER-804028 (0.84 wt, 0.93 eq) as a white foam.
C. Incorporation ofF-3a and Transformations to B-1939:
DIBAL-H,
Toluene, -75 °C
Figure imgf000086_0002
Figure imgf000086_0003
[00202] ER-803895 (F-3a) was dissolved in anhydrous toluene (14 wt.) and cooled to <-75°C under an argon atmosphere. DIBALH (1.5M in toluene, .0.95 wt., 1.3 eq.) was added at a rate to maintain the internal reaction temperature < -70 °C. The resulting mixture was stirred for 30 minutes then quenched with anhydrous methanol (0.13 wt., 3.2 eq.), maintaining the internal reaction temperature < -65 °C. The reaction mixture was allowed to warm to -10 °C and transferred with an MTBE rinse (3.74 wt.) to a worlcup vessel containing IN HCI (10.2 wt.). The mixture was stirred for 30 minutes and the aqueous layer is drained. The organic phase was washed sequentially with IN HCI (10.2 wt.), water (10 wt.), saturated aqueous sodium bicarbonate (10 wt.), and brine (10 wt.) then concentrated under reduced pressure. The concentrate was purified via silica gel chromatography to afford ER-803896 (0.96 wt., 93%) yield). The product is stored at -20°C under argon.
Figure imgf000087_0001
ER-804029
[00203] At 0 °C, a solution of azeotropically dried sulfone ER-804028 (1.0 wt., 1 eq.) in anhydrous tetrahydrofuran (5 vol., 4.45 wt.) was treated with «-butyl lithium (1.6M in hexanes, 1.02 wt., 1.5 vol., 2.05 eq.) such that the internal temperature did not exceed 5 °C. The mixture was stirred at internal temperature 0 to 5 °C for 10 minutes then cooled to < -75 °C. Azeotropically dried aldehyde ER-803896 (1.07wt., 1.23 eq.) was dissolved in anhydrous hexanes (3.53 wt., 5.35 vol.) then cooled to <-75 °C. The aldehyde solution was added to the ER-804028 anion by canula such that internal temperature < -65 °C. The mixture was stirred for 45 minutes at internal temperature -78 °C then quenched by the addition of saturated ammonium chloride (5 vol.), methyl tert-butyl ether (10 vol.), and water (5 vol.). The aqueous layer was discarded and the organic layer concentrated under reduced pressure. The crude material was purified via C-l 8 reverse phase chromatography to afford ER-804029 (84%, 1.57 wt.).
Figure imgf000088_0001
ER-804029 ER-804030
[00204] Sulfone-diol ER-804029 (1 wt., 1 eq.) was dissolved in wet dichloromethane (7.4 vol., 0.04 wt% water) and placed in a 20-25 °C water bath. Dess-Martin Reagent (0.67 wt., 2.5 eq.) was added in one portion. The reaction mixture was quenched with saturated sodium bicarbonate (10 vol) and 10 wt% aqueous sodium sulfϊte (10 vol.) and stirred for 30 minutes. The mixture was diluted with saturated sodium chloride (10 vol) and extracted with MTBE (25 vol). The aqueous layer was discarded and the organic layer concentrated and purified by silica gel chromatography to afford ER-804030 (0.9 wt., 90%). The material was stored under inert gas atmosphere at -20°C.
Figure imgf000088_0002
ER-804030
[00205] To a pre-dried reactor under inert atmosphere was charged samarium diiodide solution (2.5 eq.) and the solution cooled to internal temperature <-70 °C. ER-804030 (1 wt.) wa dissolved in anhydrous methanol (4.1 wt.) and anhydrous THF (2.3 wt.) and then cooled to <-70°C. ER-804030 was added to the cold samarium solution at a rate such that the internal temperature did not exceed -70°C. The reaction was quenched with potassium carbonate / Rochelle's Salts / water (1/10/100; w/w/v, 15 vol.) and MTBE (5 vol.) such that internal temperature did not exceed -65 °C. Upon complete addition of the worlcup solution, the reaction was warmed to room temperature and the mixture transferred to a separatory vessel using the worlcup solution (20 vol. rinse) and MTBE (20 vol. rinse). The aqueous layer was discarded, the organic layer evaporated, and the residue purified via silica gel chromatography to afford ER-118049 (0.77 wt., 85%). The product was stored at -20 °C under inert atmosphere.
Figure imgf000089_0001
Keto Aldehyde ER-118049 Allyllo Alcohol ER-118047/O48
[00206] A pre-dried reactor was charged with (S)-ligand ER-807363 (2.05 wt) and the atmosphere was exchanged for nitrogen. The CrCl2 (0.85 wt, 10 eq) was added in one portion followed by anhydrous acetonitrile (21.5 wt) and the mixture was warmed and maintained between 30 °C to 35 °C. Triethylamine (0.7 wt, 0.96 vol, 10 eq) was added in one portion and the mixture stirred for one hour. The NiCl2 (0.09 wt, 1 eq) was added in one portion, followed by the keto-aldehyde ER-118049 in anhydrous THF (2.43 wt, 2.73 vol) over 30 minutes. The heat was removed then heptane (20.5 wt, 30 vol) and Celite® (1.5 wt) were added. The mixture was stirred for 5 minutes and filtered over a pad of Celite® (15 wt) and the Celite® pad rinsed with heptane (7.3 vol) and acetonitrile (5 vol). The filtrate was transferred to a separatory funnel and the lower layer removed. The combined heptane layers were washed with acetonitrile (maximum 47.2 wt, maximum 60 vol) as necessary. The heptane layer was evaporated under reduced pressure and the product purified by silica gel chromatography to afford ER-118047/048 (0.64 wt, 70%).
Figure imgf000089_0002
ER-1180 7/048 ER-118046
[00207] Allyl alcohol ER-118047/048 was dissolved in dichloromethane (0.04 wt% water, 9 vol) and the reactor was placed in a water bath (20 °C) and the solution was treated with Dess-Martin Reagent (0.48 wt, 1.5 eq). The reaction mixture was treated with saturated aqueous sodium bicarbonate (9 vol) and 10 wt% aqueous sodium sulfite (9 vol) then stirred for 20 minutes and transferred to a separatory funnel with DCM (10 vol). The aqueous layer was discarded, and the organic layer evaporated to a residue. The crude material was purified by flash chromatography (prepped with 3 CV (1:1 (V/V) DCM/heptane, the material was loaded with 1:1 DCM/heptane then eluted with 10/10/1 heptane/DCM/MTBE). The product- containing fractions were concentrated and stored under inert atmosphere at -20 °C.
Figure imgf000090_0001
ER-118047/O48 ER-118046
[00208] Alternatively, the oxidation of ER-118047/48 to form the di-ketone ER-118046 was accomplished as follows. A flask was charged with ER-118047/48 (1 wt, 1.0 eq) and toluene (10 vol) and DMSO (0.15 wts, 2.5 eq) were added at room temperature. Et N (0.31 wts, 4.0 eq) was added and the solution was cooled to -15 °C. TCAA (0.33 wts, 1.4 eq) was added neat and the reaction warmed to 0 °C. then stirred for 10 minutes at 0 °C. The reaction was stirred for additional 10 minutes then was quenched with IPA (0.15 vol). The reaction was stirred at 0 °C for 10 minutes. IN HCI (5 vol) was added over 2 minutes, and the reaction was warmed to room temperature and diluted with MTBE (5 vol). Two clear layers formed and the aqueous layer was removed and discarded. The organic layer was washed with 5 vol of 5%> bicarbonate (aqueous), concentrated to a heavy yellow oil on a rotary evaporator and purified by silica gel chromatography (91%> isolated yield).
Figure imgf000090_0002
[00209] Into an appropriately sized reaction vessel (vessel A) was charged imidazole hydrochloride (0.39 wt, 5 eq) followed by 1 M TBAF in THF (7.6 vol, 10 eq) at ambient temperature. The resulting mixture was stirred until it is homogenous (15-30 minutes). Into a second reaction vessel (vessel B) was charged ER-118046 (1 wt, 1 eq) and THF (33 vol). The contents of vessel B were placed under an inert atmosphere and stirred until ER-118046 was fully dissolved. The contents of flask A (TB AF/Imidazole) were charged as a single portion into flask B (ER-118046/THF). After 3-4 days, the reaction solution was loaded onto a column and purified by silica gel chromatography.
Figure imgf000091_0001
[00210] The dried ER-118064 (F-12 wherein R1 is MeO) residue was dissolved in anhydrous dichloromethane (28 vol) under a nitrogen atmosphere and treated with PPTS (1.0 wt, 5.2 eq) in one portion. After 30-90 minutes, the reaction mixture was directly loaded atop an appropriately column and purified by silica gel chromatography. The desired fractions of ER-076349 were concentrated in vacuo. The material resulting from the concentration of all pure fractions was azeotroped twice from toluene (20 vol), affording ER-076349 as a crunchy colorless solid/foam (0.44 wt, 0.79 eq after correction for residual toluene).
Figure imgf000091_0002
[00211] In a clean dry reaction vessel (flask C) ER-076349 (1 wt, 1 eq) was dissolved in anhydrous toluene (20 vol) and concentrated to dryness under reduced pressure. The substrate was re-dissolved in anhydrous toluene (20 vol) and concentrated to dryness. The substrate was dissolved in DCM (5 vol), and the solution placed under an argon atmosphere. Collidine (0.66 wts, 4.0 eq) was added as a single portion. Pyridine, as a solution in DCM (Flask B), was added as a single portion (5 mole %>). The resulting mixture in flask C was cooled to an internal temperature of -20 to -25 °C. A DCM solution of Ts2O was added drop-wise keeping the internal temperature below -16 °C (1.02 eq). The reaction was stirred at -20 to -25 °C for 80 minutes then warmed to 0 °C over 20 minutes and stirred for an additional 20 minutes. The reaction was quenched with water (2 vol). The bath was removed, and the reaction allowed to warm to room temperature (15-20 °C) and stirred (20 minutes). The reaction was rinsed to a larger vessel using the IPA (100 vol) and aqueous ammonium hydroxide (100 vol) was added to the reaction. The reaction was stirred at room temperature for 15-36 hours, monitoring for the disappearance of the tosylate (ER-082892) and epoxide (ER-809681) which formed in situ. The reaction was concentrated to dryness or near dryness at reduced pressure. The resulting material was diluted with DCM (25-40 vol) and washed pH 10 buffer (NaHCO3/Na2CO3 (aq), 10 vol). The aqueous phase was back extracted with 25 vol of DCM and the combined organic layers were concentrated to dryness. The resulting free amine was purified by silica gel cliromatography using a buffered ACN/water mobile phase. The pooled fractions were concentrated at reduced pressure to remove ACN. The resulting aqueous layer was diluted with DCM (40 vol) and with 30 vol of a pH 10 buffered stock solution (NaHCO3/Na2CO3). The layers were mixed well and separated. The aqueous phase was back extracted with 25 vol of DCM and the combined organic layers were concentrated to dryness. The resulting free amine was polish filtered as a solution in 3:1 DCM/pentane and concentrated to dryness (0.80 wts) to afford B-1939.
[00212] While we have described a number of embodiments of this invention, it is apparent that our basic examples may be altered to provide other embodiments that utilize the compounds and methods of this invention. Therefore, it will be appreciated that the scope of this invention is to be defined by the appended claims rather than by the specific embodiments that have been represented by way of example.

Claims

We claim:
1. A compound of formula F-4 :
Figure imgf000093_0001
F-4 wherein: each of PG1, PG2, and PG3 is independently hydrogen or a suitable hydroxyl protecting group;
R1 is R or -OR; each R is independently hydrogen, C1-4 haloaliphatic, benzyl, or C1-4 aliphatic; and
LG is a suitable leaving group.
The compound according to claim 1, wherein said compound is of formula F-
4':
Figure imgf000093_0002
F-4'.
3. The compound according to claim 2, wherein R1 is OR wherein R is hydrogen, methyl, or benzyl.
4. The compound according to claim 2, wherein PG1 and PG2 are both hydrogen.
1
5. The compound according to claim 2, wherein each of PG and PG is independently a suitable hydroxyl protecting group.
6. The compound according to claim 5, wherein one or both of PG and PG , taken together with the oxygen atom to which each is bound, is a silyl ether or an arylalkyl ether.
1 7
7. The compound according to claim 6, wherein PG and PG are both t-butyldimethylsilyl.
8. The compound according to claim 5, wherein PG1 and PG2 are taken together, with the oxygen atoms to which they are bound, to form a diol protecting group.
9. The compound according to claim 8, wherein said diol protecting group is a cyclic acetal or Icetal, a silylene derivative, a cyclic carbonate, or a cyclic boronate.
10. The compound according to claim 2, wherein LG1 is sulphonyloxy, optionally substituted alkylsulphonyloxy, optionally substituted alkenylsulfonyloxy, or optionally substituted arylsulfonyloxy.
11. The compound according to claim 10, wherein LG1 is mesyl or tosyl.
12. The compound according to claim 2, wherein said compound is:
Figure imgf000095_0001
F-4a.
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US14/250,086 US8975422B2 (en) 2004-06-03 2014-04-10 Intermediates for the preparation of analogs of halichondrin B
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