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

【结 构 式】

【分子编号】62835

【品名】methyl (2S)-3-(benzyloxy)-2-methylpropanoate

【CA登记号】

【 分 子 式 】C12H16O3

【 分 子 量 】208.25724

【元素组成】C 69.21% H 7.74% O 23.05%

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:(II)

Chiral 5-oxohexanoic ester intermediate (XI): The reaction of 3-hydroxy-2(S)-methylpropionic acid methyl ester (I) with benzyl trichloroacetimidate gives the benzyl ether (II), which is condensed with ethylmagnesium bromide in THF to yield the chiral ketone (III). The reaction of (III) with (c-hexyl)2B-Cl ad TEA affords the boron enolate (IV), which is condensed with acetaldehyde to provide the intermediate boron aldolate (V). The reduction of (V) with LiBH4 and H2O2 in aqueous methanol gives the chiral diol (VI), which is silylated by means of Tbdms-OTf to yield the bis-silyl ether (VII). The selective deprotection of (VII) by means of CSA in methanol/dichloromethane affords the alcohol (VIII), which is debenzylated by means of H2 over Pd/C in ethanol to provide the diol (IX). The oxidation of (IX) with (COCl)2 and DMSO in dichloromethane gives the intermediate oxoaldehyde that is oxidized with NaClO2 to yield the 5-oxohexanoic acid (X). Finally, this compound is methylated with diazomethane in ethyl ether to afford the target, chiral 5-oxohexanoic ester intermediate (XI).

1 Paterson, I.; Florence, G.J.; Gerlach, K.; Scott, J.P.; Sereinig, N.; A practical synthesis of (+)-discodermolide and analogues: Fragment union by complex aldol reactions. J Am Chem Soc 2001, 123, 39, 9535.
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) 17128 Methyl (2S)-3-hydroxy-2-methylpropanoate 72657-23-9 C5H10O3 详情 详情
(II) 62835 methyl (2S)-3-(benzyloxy)-2-methylpropanoate C12H16O3 详情 详情
(III) 42633 (2S)-1-(benzyloxy)-2-methyl-3-pentanone C13H18O2 详情 详情
(IV) 62836 (E)-1-[(1S)-2-(benzyloxy)-1-methylethyl]-1-propenyl dicyclohexylborinate C25H39BO2 详情 详情
(V) 62837   C27H43BO3 详情 详情
(VI) 42635 (2S,3S,4R,5S)-6-(benzyloxy)-3,5-dimethyl-2,4-hexanediol C15H24O3 详情 详情
(VII) 42636 benzyl (2S,3R,4S,5S)-3,5-bis[[tert-butyl(dimethyl)silyl]oxy]-2,4-dimethylhexyl ether; (5R,6S,7S)-5-[(1S)-2-(benzyloxy)-1-methylethyl]-2,2,3,3,6,7,9,9,10,10-decamethyl-4,8-dioxa-3,9-disilaundecane n/a C27H52O3Si2 详情 详情
(VIII) 42637 (2S,3S,4R,5S)-6-(benzyloxy)-4-[[tert-butyl(dimethyl)silyl]oxy]-3,5-dimethyl-2-hexanol n/a C21H38O3Si 详情 详情
(IX) 42638 (2S,3R,4S,5S)-3-[[tert-butyl(dimethyl)silyl]oxy]-2,4-dimethyl-1,5-hexanediol C14H32O3Si 详情 详情
(X) 42639 (2R,3S,4R)-3-[[tert-butyl(dimethyl)silyl]oxy]-2,4-dimethyl-5-oxohexanoic acid C14H28O4Si 详情 详情
(XI) 42640 methyl (2R,3S,4R)-3-[[tert-butyl(dimethyl)silyl]oxy]-2,4-dimethyl-5-oxohexanoate C15H30O4Si 详情 详情
Extended Information