Mechanism-Driven Elaboration of an Enantioselective Bromocyclopropanation Reaction of Allylic Alcohols
作者:Sylvain Taillemaud、Nicolas Diercxsens、Alexandre Gagnon、André B. Charette
DOI:10.1002/anie.201506083
日期:2015.11.16
bromocyclopropanation of allylic alcohols using dibromomethylzinc bromide is described. Spectroscopic studies to monitor the formation of transient intermediates not only led to the development of a more‐atom‐economical halocyclopropanation reaction, but also highlighted the unique role of ether additives in the process. The desired bromo‐substituted cyclopropanes were isolated in high yields and excellent
描述了使用二溴甲基锌溴化物对烯丙基醇进行立体选择性溴环丙烷化。监测瞬态中间体形成的光谱学研究不仅导致了更原子经济的卤代环丙烷化反应的发展,而且突出了醚添加剂在该过程中的独特作用。使用容易获得的试剂,可以高收率,极好的非对映异构性和对映选择性分离出所需的溴代取代的环丙烷。