Highly enantioselective direct Michael addition of 1,3-dicarbonyl compounds to β-fluoroalkyl-α-nitroalkenes
作者:Yan Zhao、Xiao-Jin Wang、Yun Lin、Chen-Xin Cai、Jin-Tao Liu
DOI:10.1016/j.tet.2014.02.062
日期:2014.4
Cinchona alkaloid catalysts were used in the Michaeladdition reaction of 1,3-dicarbonylcompounds to β-fluoroalkyl-α-nitroalkenes for the first time. The catalytic system performed well over a broad scope of substrates including β-keto esters and 1,3-diketones with high diastereoselectivities and excellent enantioselectivities (up to 99% ee) under mild conditions. A wide range of useful fluorinated