Asymmetric Synthesis of 2,3-Dihydroquinolin-4-one Derivatives Catalyzed by a Chiral Bisguanidium Salt
作者:Xiao Xiao、Xiaohua Liu、Shunxi Dong、Yunfei Cai、Lili Lin、Xiaoming Feng
DOI:10.1002/chem.201203216
日期:2012.12.7
Worth its salt: An orgnaocatalytic asymmetric intramolecular aza‐Michael reaction and one‐pot bromination reaction of activated α,β‐unsaturated ketones have been realized using a chiral bisguanidium salt (see scheme). Optically enriched 2‐aryl‐ and 2‐alkyl‐substituted dihydroquinones and brominated dihydroquinones could be obtained (up to 99 % yield and 99 % ee for the aza‐Michael reaction; and up
值得一提的盐是:使用手性双胍盐已经实现了已激活的α,β-不饱和酮的有机催化的不对称分子内氮杂Michael-Michael反应和单锅溴化反应(参见方案)。可以得到光学富集的2-芳基和2-烷基取代的二氢醌和溴化的二氢醌(对于aza-Michael反应,产率高达99%,ee为99% ;产率高达95%,96:4 dr和95溴化反应的% ee)。