thoxybenzyloxy)–8β,15,15-trimethyl-4-methylene-trans-bicyclo[6.4.0]dodecan-9-one 2 that corresponds to BC ring system of Taxol was prepared from 8-membered ring enone 3 in high yield via stereoselctive Michael addition and successive intramolecular aldol cyclization. The above 8-membered ring enone 3 was synthesized from the linear optically active polyoxy-compound 4 by SmI2-mediated intramolecular
光学活性 2α,10β-dibenzyloxy-11β-(t-丁基二甲基甲
硅烷氧基)-7β-hydroxy-1α-(4-methoxybenzyloxy)–8β,15,15-trimethyl-4-methylene-trans-bicyclo[6.4.0]dodecan- 9-one 2 对应于
紫杉醇的 BC 环系统,由 8 元环烯酮 3 通过立体选择性迈克尔加成和连续分子内羟醛环化以高产率制备。上述 8 元环烯酮 3 是由线性光学活性聚氧化合物 4 通过
SmI2 介导的分子内羟醛环化合成的。