Organocatalytic Asymmetric Sulfa-Michael Addition of Thiols to 4,4,4-Trifluorocrotonates
作者:Xiu-Qin Dong、Xin Fang、Chun-Jiang Wang
DOI:10.1021/ol201766k
日期:2011.8.19
The first asymmetric sulfa-Michael addition of thiols to 4,4,4-trifluorocrotonates for the construction of a stereogenic center bearing a unique trifluoromethyl group and a sulfur atom has been achieved in high yields and excellent enantioselectivities with a 1 mol % bifunctional organocatalyst. Subsequent transformation led to the expedient preparation of enantioenriched thiochroman-4-one and the key intermediate of the potent inhibitor of MMP-3, (R)-gamma-trifluoromethyl gamma-sulfone hydroxamate.
Diastereoselective Thiophenol Addition to (S)-N-.alpha.,.beta.-Unsaturated carbonyl- .gamma.-[(trityloxy)methyl]-.gamma.-butyrolactams