organocatalyzed asymmetric sulfa-Michael addition of thiocarboxylic acids to β-trifluoromethyl-α,β-unsaturated ketones with a chiral bifunctional amine-squaramide as the catalyst is presented. A wide range of chiral ketone compounds bearing a sulfur atom and a trifluoromethyl group at the stereogenic carbon center could be obtained with excellent results (up to 99% yield, 97% ee) under mild conditions. The developed
提出了以手性双官能胺-
方酸酰胺为催化剂的
硫代
羧酸的有机催化不对称
磺胺-迈克尔加成反应到β-三
氟甲基-α,β-不饱和酮上。在温和的条件下,可以获得在立体碳原子中心带有
硫原子和三
氟甲基的多种手性酮化合物,并具有优异的结果(产率高达99%,ee达97%)。发达的催化体系对(E)-和(Z)-β-三
氟甲基化-α,β-不饱和酮均具有良好的耐受性。