Organocatalytic Cascade Sulfa-Michael/Aldol Reaction of β,β-Disubstituted Enones: Enantioselective Synthesis of Tetrahydrothiophenes with a Trifluoromethylated Quaternary Center
作者:Yu Su、Jun-Bing Ling、Shuang Zhang、Peng-Fei Xu
DOI:10.1021/jo4016024
日期:2013.11.1
squaramide-catalyzed sulfa-Michael/aldol cascade reaction initiated by sulfa-Michael addition of mercaptoacetaldehyde to β-aryl-β-trifluoromethylated enones is successfully developed. The functionalized tetrahydrothiophenes with three continuous stereocenters including a trifluoromethylated quaternary carbon are readily obtained with moderate to good yields and high enantioselectivities.
成功开发了由磺胺-迈克尔将巯基乙醛加成到β-芳基-β-三氟甲基化的烯酮引发的双官能方酰胺催化的磺胺-迈克尔/羟醛级联反应。具有中等至良好的产率和高对映选择性,容易获得具有三个连续的立体中心的官能化的四氢噻吩,所述三个立体中心包括三氟甲基化的季碳。