The first example for the asymmetric synthesis of allenes by the Doering–LaFlamme allene synthesis with enantiopure cyclopropylmagnesium carbenoids
作者:Hitoshi Momochi、Takafumi Noguchi、Toshifumi Miyagawa、Naoki Ogawa、Makoto Tadokoro、Tsuyoshi Satoh
DOI:10.1016/j.tetlet.2011.03.150
日期:2011.6
carbanion of enantiopure dichloromethyl p-tolyl sulfoxide with α,β-unsaturated carbonyl compounds gave optically active 1-chlorocyclopropyl p-tolyl sulfoxides having a carbonyl group with high asymmetric induction from the sulfur chiral center. Reduction of the carbonyl group followed by treatment with Grignard reagent, the 1-chlorocyclopropyl p-tolyl sulfoxides resulted in the formation of enantiopure allenic
对映体纯的二氯甲基对甲苯基亚砜的α-亚磺酰基锂的锂与α,β-不饱和羰基化合物的反应从硫手性中心得到具有羰基的光学活性的1-氯环丙基对甲苯基亚砜,具有高的不对称诱导性。羰基还原,然后用Grignard试剂处理,1-氯环丙基对甲苯基亚砜通过对映纯环丙基镁类卡宾中间体的Doering-LaFlamme型重排形成对映纯烯丙醇。这是通过Doering-LaFlamme Allene合成法进行的不对称合成Allene的第一个示例。