Enantioselective Synthesis of β,γ-Unsaturated α-Fluoroesters Catalyzed by N-Heterocyclic Carbenes
作者:Yu-Ming Zhao、Man Sing Cheung、Zhenyang Lin、Jianwei Sun
DOI:10.1002/anie.201204521
日期:2012.10.8
NHC meets F: NHC‐bound enolates undergo a catalytic asymmetric fluorination reaction to β,γ‐unsaturatedα‐fluoroesters, which are obtained with good efficiency and stereoselectivity (see scheme, NFSI=N‐fluorobenzenesulfonimide). The strategy overcomes possible challenges, such as fluorination in the γ position and difluorination. Experimental evidence combined with DFT calculations provides insight