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

【结 构 式】

【分子编号】58050

【品名】(6S)-6,8-bis(benzyloxy)octanoic acid

【CA登记号】

【 分 子 式 】C22H28O4

【 分 子 量 】356.46192

【元素组成】C 74.13% H 7.92% O 17.95%

与该中间体有关的原料药合成路线共 1 条

合成路线1

该中间体在本合成路线中的序号:(XXIX)

A further procedure for the preparation of the key intermediate (XIII) utilized the chiral starting material (S)-4-benzyloxy-1,2-butanediol (XIX), easily accessible from (S)-malic acid. Inversion of the configuration of (XIX) was accomplished via formation of dimesylate (XX), followed by displacement with potassium acetate in refluxing Ac2O. The resultant diacetate (XXI) was hydrolyzed to the required (R)-diol (XXII) by treatment with K2CO3 in MeOH. Conversion of (XXII) into epoxide (XXIV) was performed through the benzylidene ketal (XXIII), following the reported procedure for the corresponding (S)-enantiomer. Copper(I)-catalyzed addition of 3-butenylmagnesium bromide (XXV) to epoxide (XXIV) furnished alcohol (XXVI), which was further protected as the benzyl ether (XXVII). Hydroboration of olefin (XXVII) with in situ generated disiamylborane, followed by oxidative work-up gave rise to the primary alcohol (XXVIII). This was oxidized with pyridinium dichromate to the carboxylic acid (XXIX), which was further esterified by means of methanolic HCl to afford ester (XXX). Then, catalytic hydrogenolysis of the di(benzyloxy) ester (XXX) yielded the target intermediate dihydroxyester (XIII).

1 Brookes, M.H.; et al.; Syntheses of alpha-(R)- and alpha-(S)-lipoic acid from (S)-malic acid. J Chem Soc - Perkins Trans I 1988, 1, 9.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(XIII) 57977 methyl (6S)-6,8-dihydroxyoctanoate C9H18O4 详情 详情
(XIX) 58043 (2S)-4-(benzyloxy)-1,2-butanediol C11H16O3 详情 详情
(XX) 58044 (2S)-4-(benzyloxy)-2-[(methylsulfonyl)oxy]butyl methanesulfonate C13H20O7S2 详情 详情
(XXI) 58045 (2R)-2-(acetyloxy)-4-(benzyloxy)butyl acetate C15H20O5 详情 详情
(XXII) 58052 (2R)-4-(benzyloxy)-1,2-butanediol C11H16O3 详情 详情
(XXIII) 58046 (4R)-4-[2-(benzyloxy)ethyl]-2-phenyl-1,3-dioxolane; benzyl 2-[(4R)-2-phenyl-1,3-dioxolan-4-yl]ethyl ether C18H20O3 详情 详情
(XXIV) 42367 benzyl 2-[(2S)oxiranyl]ethyl ether; (2S)-2-[2-(benzyloxy)ethyl]oxirane C11H14O2 详情 详情
(XXV) 35896 bromo(3-butenyl)magnesium 7103-09-5 C4H7BrMg 详情 详情
(XXVI) 58047 (3S)-1-(benzyloxy)-7-octen-3-ol C15H22O2 详情 详情
(XXVII) 58048 1-({[(3S)-3-(benzyloxy)-7-octenyl]oxy}methyl)benzene; benzyl (1S)-1-[2-(benzyloxy)ethyl]-5-hexenyl ether C22H28O2 详情 详情
(XXVIII) 58049 (6S)-6,8-bis(benzyloxy)-1-octanol C22H30O3 详情 详情
(XXIX) 58050 (6S)-6,8-bis(benzyloxy)octanoic acid C22H28O4 详情 详情
(XXX) 58051 methyl (6S)-6,8-bis(benzyloxy)octanoate C23H30O4 详情 详情
Extended Information