Highly Efficient Catalytic Asymmetric Sulfa-Michael Addition of Thiols to trans-4,4,4-Trifluorocrotonoylpyrazole
作者:Xiu-Qin Dong、Xin Fang、Hai-Yan Tao、Xiang Zhou、Chun-Jiang Wang
DOI:10.1002/adsc.201100899
日期:2012.4.16
A new protocol for the efficient construction of chiral trifluoromethylated building blocks was developed via organocatalyzed sulfa‐Michael addition of thiols to the cost‐efficient trans‐trifluorocrotonamide. Introducing the pyrazole moiety is crucial to providing H‐bond acceptor sites for better activation and hence affording comparable asymmetric induction with that obtained when employing the expensive
通过有机催化的磺胺-迈克尔加成硫醇到具有成本效益的反式-三氟巴豆酰胺中,开发了一种有效构建手性三氟甲基化结构单元的新方案。引入吡唑部分对于提供更好的活化H-键受体位点至关重要,因此可提供与使用昂贵的cis -4,4,4-三氟巴豆酸酯作为Michael受体时相当的不对称诱导。