Highly stereocontrolled asymmetric syntheses of taxol and taxotère C-13 side chain analogues
作者:Chisato Mukai、In Jong Kim、Etsuko Furu、Miyoji Hanaoka
DOI:10.1016/s0040-4020(01)81916-5
日期:1993.1
Asymmetric aldol reaction of (+)-tricarbonyl(η6-2-trimethylsilylbenzaldehyde)chromium(0) complex (4) with titanium enolate of S-tert-butyl benzyloxyethanethioate (10) provided, after consecutive desilylation and decomplexation, anti-aldol product 15 in a highly stereoselective manner. Anti-product 15 was subsequently converted to (2R,3S)-N-benzoyl- and N-tert-butoxycarbonyl-3-phenylisoserine methyl
(+)的不对称醛醇缩合反应-三羰基(η 6 -2- trimethylsilylbenzaldehyde)铬(0)配合物(4),用钛烯醇S-叔丁基benzyloxyethanethioate(10)提供,之后连续脱甲硅烷基和解络,抗-aldol产品以高度立体选择性的方式在图15中示出。随后将反产物15转化为(2R,3S)-N-苯甲酰基-和N-叔丁氧基羰基-3-苯基异丝氨酸甲酯(23和24),紫杉醇的C-13侧链类似物(1)和紫杉醇(2)。