Synthesis of 3-azabicyclo[3.1.0]hexanes by insertion of cyclopropylmagnesium carbenoids into an intramolecular C–H bond adjacent to a nitrogen atom
作者:Tsutomu Kimura、Natsumi Wada、Takahiro Tsuru、Taro Sampei、Tsuyoshi Satoh
DOI:10.1016/j.tet.2015.02.059
日期:2015.9
via 1,5-C–H insertion of cyclopropylmagnesium carbenoids as a key step. 1-Chlorocyclopropyl p-tolyl sulfoxides with an N,N-disubstituted aminomethyl group on the cyclopropane ring were prepared from dichloromethyl p-tolyl sulfoxide, α,β-unsaturated carboxylic acid esters, primary amines, and alkyl halides. Treatment of the sulfoxides with i-PrMgCl generated cyclopropylmagnesium carbenoids, which were
作为关键步骤,通过环丙基镁类胡萝卜素的1,5-CH插入合成了各种3-氮杂双[3.1.0]己烷。1-氯p -甲苯基与亚砜Ñ,ñ二取代从二氯制备环丙烷环上氨基甲基p -甲苯基砜,α,β不饱和羧酸酯,伯胺,和烷基卤。用i- PrMgCl处理亚砜后生成环丙基镁类胡萝卜素,将其插入与氮原子相邻的分子内C-H键中,生成3-氮杂双环[3.1.0]己烷,收率高达94%。C–H键对插入的反应性按NC H 3,NC的顺序增加H 2 CH 3,N CH 2 Ph和NC H(CH 3)2。光学活性的3-氮杂双环[3.1.0]己烷使用成功地合成š -手性p -tolylsulfinyl基作为手性助剂。