Treatment of (Z)-1-bromoalk-1-enyldialkylboranes 1 with DMSO results in 1,2-migration of an alkyl group from the boron to the α-carbon without elimination of bromine to give internal (E)-alkenyl bromides 2 with excellent stereoselectivity (>99%).
将(Z)-1-
溴代烯丙基二烷基
硼烷 1 溶于
二甲基亚砜,烷基会从
硼原子向α-碳迁移,同时
溴原子不会消除,生成具有优异立体选择性(>99%)的内型(E)-烯丙基
溴化物 2。