作者:Takashi Takahashi、Hisao Nemoto、Yutaka Kanda、Jiro Tsuji、Yoshimasa Fukazawa、Toshiya Okajima、Yutaka Fujise
DOI:10.1016/s0040-4020(01)87733-4
日期:1987.1
A new route to construct the carbon skeleton of germacrane sesquiterpenes is described wherein the 13-membered diallylic ethers 12 and 41, prepared by intramolecular O-alkylation of the bromo alcohol and C-alkylation of the cyanohydrin ether respectively, undergo [2,3]-Wittig rearrangement to give the ten-membered carbocycles. Diastereoselectivity in [2,3]-Wittig rearrangement is discussed based on
描述了一种新的方法来构建胚芽倍半萜的碳骨架,其中分别通过溴醇的分子内O-烷基化和氰醇醚的C-烷基化制备的13元二烯丙基醚12和41经历[2,3]。 -威蒂格重排以产生十元碳环自行车。基于ab-initio计算,基于MM2过渡结构模型,讨论了[2,3] -Wittig重排中的非对映选择性。