Highly efficient asymmetric construction of quaternary carbon-containing homoallylic and homopropargylic amines
作者:Tao Guo、Ran Song、Bin-Hua Yuan、Xiao-Yang Chen、Xing-Wen Sun、Guo-Qiang Lin
DOI:10.1039/c3cc42481b
日期:——
A highly efficient method for the asymmetric synthesis of chiral quaternary carbon-containing homoallylic and homopropargylic amines under mild conditions was achieved with good yields and high diastereoselectivities.
Two strategies based on kinetic resolution(s) of chiral alanes and providing enantioenriched syn homoallylamines are reported. The first implies a single kinetic resolution of the alane using camphor; the second requires two sequential kinetic resolutions using the synergistic combination of (−)-camphor/(R)-tert-butylsulfinamide-derived imines. This syn selectivity, specific to the use of allyaluminum
Reagent-Controlled Highly Stereoselective Difluoromethylation: Efficient Access to Chiral α-Difluoromethylamines from Ketimines
作者:Qinghe Liu、Taige Kong、Chuanfa Ni、Jinbo Hu
DOI:10.3390/molecules27207076
日期:——
A reagent-controlled highly stereoselective reaction between (S)-difluoromethyl phenyl sulfoximine 1 and imines is reported, and this synthetic method provides a variety of enantiomerically enriched α-difluoromethyl amines. The main pros of this approach include high efficiency, high stereoselectivity, and a broad substrate scope, which is probably achieved through a non-chelating transition state