Highly enantioselective synthesis of α-trichloromethyldihydropyrans catalyzed by bifunctional organocatalysts
作者:Hai-Feng Wang、Peng Li、Hai-Feng Cui、Xiao-Wei Wang、Jun-Kang Zhang、Wen Liu、Gang Zhao
DOI:10.1016/j.tet.2011.01.043
日期:2011.3
The enantioselective Michael addition of alpha-cyanoketones to alpha,beta-unsaturated trichloromethyl ketones was firstly reported. With a phenylalanine-derived bifunctional piperazine/thiourea catalyst, a series of alpha-trichloromethyldihydropyrans were obtained with up to 95% ee and 99% yield. (C) 2011 Elsevier Ltd. All rights reserved.