SYNTHESIS OF C1–C6 FRAGMENT FOR EPOTHILONE A VIA LIPASE-CATALYZED OPTICAL RESOLUTION
作者:Kosei Shioji、Hitomi Kawaoka、Asami Miura、Kentaro Okuma
DOI:10.1081/scc-100107003
日期:2001.1
Synthesis of 5-oxo-(3S)-hydroxy-4,4-dimethylheptanoic acid (1), C1–C6 fragment of epothilone A, is described. Racemic tert-butyl 5-oxo-(3S)-acetoxy-4,4-dimethylheptanoate (5) was prepared by acylation of enamine followed by aldol condensation. Optical resolution of the heptanoate 5 was carried out by lipase catalyzed hydrolysis (yield 50%, > 98% e.e.).
描述了埃坡霉素 A 的 C1-C6 片段 5-氧代-(3S)-羟基-4,4-二甲基庚酸 (1) 的合成。外消旋叔丁基 5-氧代-(3S)-乙酰氧基-4,4-二甲基庚酸酯 (5) 通过烯胺酰化和羟醛缩合制备。庚酸酯 5 的光学拆分是通过脂肪酶催化水解进行的(产率 50%,> 98% ee)。