An optically active vinylic sulfoxide bearing a leaving group at the γ-position was stereoselectively transformed into a chiral cyclopropane by means of a Michael addition with an allylmagnesium bromide. The Michael induced ring-closure reaction requires both allylmagnesium bromide as a uncleophile and chloride as a leaving group for high diastereoselectivity. The absolute stereochemistry of the cycloadduct was confirmed by X-ray analysis.
通过与烯丙基溴化镁的迈克尔加成反应,一种在 γ 位带有离去基团的光学活性乙烯基亚砜被立体选择性地转化为手性环丙烷。迈克尔诱导的闭环反应需要溴化烯丙基镁作为不亲和基和氯化物作为离去基团才能实现高非对映选择性。通过 X 射线分析确认了环加合物的绝对立体化学性质。