• English
  • 简体中文
Login Register
Current Location: Home > Feedback Help Print

【结 构 式】

【药物名称】Bengamide B

【化学名称】Tetradecanoic acid 1-methyl-7-oxo-6(S)-[3(R),4(S),5(R)-trihydroxy-2(R)-methoxy-8-methyl-6(E)-nonenamido]hexahydro-1H-azepin-3(S)-yl ester

【CA登记号】104947-69-5

【 分 子 式 】C32H58N2O8

【 分 子 量 】598.82766

【开发单位】National Cancer Institute (Not Determined), Novartis (Not Determined)

【药理作用】Oncolytic Drugs

合成路线1

The intermediate lactone (VII) was prepared as follows. Alpha-D-glucoheptonic gamma-lactone (I) was converted to the bis(acetonide) (II) by treatment with I2 in acetone. Methylation of the free hydroxyl group of (II) using Ag2O and methyl iodide provided the methyl ether (III). Selective removal of 1,2-acetonide of (III) in the presence of the 1,3-acetonide was accomplished by treatment of (III) with acetic acid. The resulting vicinal diol (IV) was then subjected to oxidative cleavage with NaIO4 to produce aldehyde (V). This was then olefinated with the low-valent organochromium species generated in situ from 1,1-diiodoisobutane (VI) and CrCl2 to produce the E-olefin (VII) as the major isomer, which was isolated using preparative HPLC.

1 Kinder, F.R. Jr.; et al.; Total synthesis of bengamides B and E. J Org Chem 2001, 66, 6, 2118.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(I) 47767 (3R,4S,5S)-3,4-dihydroxy-5-[(1R,2R)-1,2,3-trihydroxypropyl]dihydro-2(3H)-furanone C7H12O7 详情 详情
(II) 47768 (4R,4aS,7R,7aS)-4-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-7-hydroxy-2,2-dimethyltetrahydro-6H-furo[3,2-d][1,3]dioxin-6-one C13H20O7 详情 详情
(III) 47769 (4R,4aS,7R,7aS)-4-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-7-methoxy-2,2-dimethyltetrahydro-6H-furo[3,2-d][1,3]dioxin-6-one C14H22O7 详情 详情
(IV) 47770 (4R,4aR,7R,7aS)-4-[(1R)-1,2-dihydroxyethyl]-7-methoxy-2,2-dimethyltetrahydro-6H-furo[3,2-d][1,3]dioxin-6-one C11H18O7 详情 详情
(V) 47771 (4S,4aS,7R,7aS)-7-methoxy-2,2-dimethyl-6-oxotetrahydro-4H-furo[3,2-d][1,3]dioxine-4-carbaldehyde C10H14O6 详情 详情
(VI) 47772 1,1-diiodo-2-methylpropane C4H8I2 详情 详情
(VII) 47773 (4R,4aR,7R,7aS)-7-methoxy-2,2-dimethyl-4-[(E)-3-methyl-1-butenyl]tetrahydro-6H-furo[3,2-d][1,3]dioxin-6-one C14H22O5 详情 详情

合成路线2

Cyclization of 5(R)-hydroxy-L-lysine (VIII) by means of EDC and HOBt, followed by treatment of the resulting amino lactam (IX) with Boc2O, furnished the N-Boc aminolactam (X). The configuration of the (R)-secondary alcohol was inverted by Mitsunobu coupling with p-nitrobenzoic acid (XI) to produce the (S)-p-nitrobenzoate ester (XII). Methylation of the lactam N of (XII) yielded (XIII), and hydrolysis of the p-nitrobenzoate ester of (XIII) with LiOH afforded the (S)-hydroxy lactam (XIV). Esterification of (XIV) with myristic acid (XV) in the presence of EDC and DMAP produced the myristate ester (XVI). Treatment of (XVI) with trifluoroacetic acid removed the Boc protecting group to yield amine (XVII). This was then condensed with the intermediate lactone (VIII) in refluxing isopropanol to produce amide (XVIII). Finally, acetonide hydrolysis in (XVIII) employing trifluoroacetic acid generated the title compound.

1 Kinder, F.R. Jr.; et al.; Total synthesis of bengamides B and E. J Org Chem 2001, 66, 6, 2118.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(VII) 47773 (4R,4aR,7R,7aS)-7-methoxy-2,2-dimethyl-4-[(E)-3-methyl-1-butenyl]tetrahydro-6H-furo[3,2-d][1,3]dioxin-6-one C14H22O5 详情 详情
(VIII) 47774 (2S,5R)-2,6-diamino-5-hydroxyhexanoic acid C6H14N2O3 详情 详情
(IX) 47775 (3S,6R)-3-amino-6-hydroxy-2-azepanone C6H12N2O2 详情 详情
(X) 47776 tert-butyl (3S,6R)-6-hydroxy-2-oxoazepanylcarbamate C11H20N2O4 详情 详情
(XI) 18119 4-nitrobenzoic acid; p-nitrobenzoic acid 62-23-7 C7H5NO4 详情 详情
(XII) 47777 (3S,6S)-6-[(tert-butoxycarbonyl)amino]-7-oxoazepanyl 4-nitrobenzoate C18H23N3O7 详情 详情
(XIII) 47778 (3S,6S)-6-[(tert-butoxycarbonyl)amino]-1-methyl-7-oxoazepanyl 4-nitrobenzoate C19H25N3O7 详情 详情
(XIV) 47779 tert-butyl (3S,6S)-6-hydroxy-1-methyl-2-oxoazepanylcarbamate C12H22N2O4 详情 详情
(XV) 47780 myristic acid C14H28O2 详情 详情
(XVI) 47781 (3S,6S)-6-[(tert-butoxycarbonyl)amino]-1-methyl-7-oxoazepanyl myristate C26H48N2O5 详情 详情
(XVII) 47783 (3S,6S)-6-amino-1-methyl-7-oxoazepanyl myristate C21H40N2O3 详情 详情
(XVIII) 47782 (3S,6S)-6-[((2R)-2-[(4R,5R,6R)-5-hydroxy-2,2-dimethyl-6-[(E)-3-methyl-1-butenyl]-1,3-dioxan-4-yl]-2-methoxyethanoyl)amino]-1-methyl-7-oxoazepanyl myristate C35H62N2O8 详情 详情

合成路线3

The condensation of the chiral imide (I) with aldehyde (II) by means of Et2B-OTf and DIEA in dichloromethane gives the hydroxy-imide (III), which is protected with Tbdms-Cl and imidazole to yield the silyl ether (IV). The cleavage of the chiral auxiliary of (IV), followed by reduction with DIBAL in THF affords the aldehyde (V), which is condensed with the silylated enol ether (VI) by means of SnCl4 in dichloromethane to provide the target intermediate, the phenyl thioester (VII).

1 Boeckman, R.K.; Clark, T.J.; Shook, B.C.; A practical enantioselective total synthesis of the bengamides B, E, and Z. Org Lett 2002, 4, 12, 2109.
2 Boeckman, R.K.; et al.; The development of a convergent and efficient enantioselective synthesis of the bengamides via a common polyol intermediate. Helv Chim Acta 2002, 85, 12, 4532.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(I) 57110 4,5,5-trimethyl-2-[2-(2-naphthyloxy)acetyl]-2-azabicyclo[2.2.1]heptan-3-one C21H23NO3 详情 详情
(II) 57111 4-Methyl-2-pentenal 5362-56-1 C6H10O 详情 详情
(III) 57112 2-[(2S,3R,4E)-3-hydroxy-6-methyl-2-(2-naphthyloxy)-4-heptenoyl]-4,5,5-trimethyl-2-azabicyclo[2.2.1]heptan-3-one C27H33NO4 详情 详情
(IV) 57113 2-[(2S,3R,4E)-3-{[tert-butyl(dimethyl)silyl]oxy}-6-methyl-2-(2-naphthyloxy)-4-heptenoyl]-4,5,5-trimethyl-2-azabicyclo[2.2.1]heptan-3-one C33H47NO4Si 详情 详情
(V) 57114 (2S,3R,4E)-3-{[tert-butyl(dimethyl)silyl]oxy}-6-methyl-2-(2-naphthyloxy)-4-heptenal C24H34O3Si 详情 详情
(VI) 57115 (Z)-2-methoxy-1-(phenylsulfanyl)ethenyl trimethylsilyl ether; {[(Z)-2-methoxy-1-(phenylsulfanyl)ethenyl]oxy}(trimethyl)silane C12H18O2SSi 详情 详情
(VII) 57116 S-phenyl (2R,3S,4R,5R,6E)-5-{[tert-butyl(dimethyl)silyl]oxy}-3-hydroxy-2-methoxy-8-methyl-4-(2-naphthyloxy)-6-nonenethioate C33H44O5SSi 详情 详情

合成路线4

The cyclization of 2(R)-bromobutane-1,4-diol (VIII) by means of NaH in THF, followed by acylation with Ts-Cl gives the chiral epoxide (IX), which is treated with NaI in hot acetone to yield the iodo-epoxide (X). The enantiocontrolled condensation of (X) with the commercial imine (XI) by means of Cs-OH catalyzed by a chiral phase transfer catalyst affords the epoxy iminoester (XII). The reaction of the epoxy group of (XII) with N-methylbenzylamine in methanol provides the expected amino-alcohol (XIII), which is treated with citric acid to hydrolyze the imino group to give amine (XIV). Elimination of the benzyl protecting group of (XIV) by means of H2 over Pd/C yields the diamino ester (XV), which is cyclized to the hydroxy-caprolactam (XVI) by reaction with Na-OMe in methanol at 80 C in a sealed tube. The reaction of the OH group of (XVI) with tetradecanoyl chloride (XVII) by means of TFA affords the corresponding ester (XVIII). The condensation of the amino group of (XVIII) with the intermediate phenyl thioester (VII) in refluxing dioxane provides the corresponding amide (XIX), which is finally deprotected by a first treatment with DDQ in water/methanol/dichloromethane, followed by desilylation with PPTS in hot methanol/dichloromethane to yield the target bengamide B.

1 Boeckman, R.K.; Clark, T.J.; Shook, B.C.; A practical enantioselective total synthesis of the bengamides B, E, and Z. Org Lett 2002, 4, 12, 2109.
2 Boeckman, R.K.; et al.; The development of a convergent and efficient enantioselective synthesis of the bengamides via a common polyol intermediate. Helv Chim Acta 2002, 85, 12, 4532.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(VII) 57116 S-phenyl (2R,3S,4R,5R,6E)-5-{[tert-butyl(dimethyl)silyl]oxy}-3-hydroxy-2-methoxy-8-methyl-4-(2-naphthyloxy)-6-nonenethioate C33H44O5SSi 详情 详情
(VIII) 57126 (2R)-2-bromo-1,4-butanediol C4H9BrO2 详情 详情
(IX) 57117 2-[(2S)oxiranyl]ethyl 4-methylbenzenesulfonate C11H14O4S 详情 详情
(X) 57118 (2S)-2-(2-iodoethyl)oxirane C4H7IO 详情 详情
(XI) 57119 tert-butyl 2-[(diphenylmethylene)amino]acetate C19H21NO2 详情 详情
(XII) 57120 tert-butyl (2S)-2-[(diphenylmethylene)amino]-4-[(2S)oxiranyl]butanoate C23H27NO3 详情 详情
(XIII) 57121 tert-butyl (2S,5S)-6-[benzyl(methyl)amino]-2-[(diphenylmethylene)amino]-5-hydroxyhexanoate C31H38N2O3 详情 详情
(XIV) 57122 tert-butyl (2S,5S)-2-amino-6-[benzyl(methyl)amino]-5-hydroxyhexanoate C18H30N2O3 详情 详情
(XV) 57123 tert-butyl (2S,5S)-2-amino-5-hydroxy-6-(methylamino)hexanoate C11H24N2O3 详情 详情
(XVI) 57124 (3S,6S)-3-amino-6-hydroxy-1-methyl-2-azepanone C7H14N2O2 详情 详情
(XVII) 30295 tetradecanoyl chloride 112-64-1 C14H27ClO 详情 详情
(XVIII) 47783 (3S,6S)-6-amino-1-methyl-7-oxoazepanyl myristate C21H40N2O3 详情 详情
(XIX) 57125 (3S,6S)-6-{[(2R,3S,4R,5R,6E)-5-{[tert-butyl(dimethyl)silyl]oxy}-3-hydroxy-2-methoxy-8-methyl-4-(2-naphthyloxy)-6-nonenoyl]amino}-1-methyl-7-oxoazepanyl myristate C48H78N2O8Si 详情 详情
Extended Information