Benzotriazole-Mediated [2,3]-Wittig Rearrangement. General and Stereocontrolled Syntheses of Homoallyl Alcohols and β,γ-Unsaturated Ketones
作者:Alan R. Katritzky、Hong Wu、Linghong Xie
DOI:10.1021/jo960019d
日期:1996.1.1
give secondary and tertiary homoallyl alcohols (16 and 21), respectively, exclusively in the E configuration in excellent yields. This is achieved by deprotonation followed by [2,3]-Wittig rearrangement, departure of the benzotriazolyl group, and then nucleophilic addition to the resulting carbonyl compound. Following a similar protocol, primary E-homoallyl alcohols 18 are prepared in good yield by the
易获得的烯丙基1-(苯并三唑-1-基)烷基醚(13和19),在用2.5当量的亲核锂试剂处理后,分别分别以E构型得到仲和叔烯丙基醇(16和21)。优异的产量。这可以通过去质子化,然后进行[2,3] -Wittig重排,苯并三唑基的离去,然后亲核加成到所形成的羰基化合物中来实现。按照类似的方案,在NaBH(4)存在下,通过醚13与LDA的反应以高收率制备伯E-全烯丙基醇18。我们的方法补充了Still和Bruckner的伯均烯丙基醇的立体化学Z选择性合成。用LDA生成的19种阴离子的Wittig重排类似地提供了E-beta,