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Amide Groups Switch Selectivity: C–H Trifluoromethylation of α,β-Unsaturated Amides and Subsequent Asymmetric Transformation

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posted on 2014-11-21, 00:00 authored by Lei Li, Jing-Yao Guo, Xing-Guo Liu, Su Chen, Yong Wang, Bin Tan, Xin-Yuan Liu
The first direct C–H β-trifluoromethylation of unsubstituted or α-alkyl-substituted α,β-unsaturated carbonyl compounds under metal-free conditions was realized with excellent regio- and stereoselectivity as well as a very broad substrate scope. Both olefinic and allylic trifluoromethylation products are accessible with high selectivities by altering the substrate substitutions. The resultant olefinic products, namely (E)-β-trifluoromethyl (CF3) α,β-unsaturated hydroxamic acid derivatives, served as acceptors in organocatalytic asymmetric Michael addition reactions to give hydroxamic acid derivatives bearing a chiral CF3-substituted stereocenter with high enantioselectivities.

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