N,N′-Dioxide–nickel(II) complex catalyzed asymmetric Michael addition of cyclic 1,3-dicarbonyl compounds to β,γ-unsaturated α-ketoesters
作者:Zhenhua Dong、Juhua Feng、Weidi Cao、Xiaohua Liu、Lili Lin、Xiaoming Feng
DOI:10.1016/j.tetlet.2011.04.089
日期:2011.7
A direct asymmetric Michael addition of cyclic 1,3-dicarbonyl compounds to β,γ-unsaturated α-ketoesters could be efficiently catalyzed by an N,N′-dioxide–nickel(II) complex. A series of chiral warfarin derivatives were obtained in excellent yields (up to 99%) with high enantioselectivities (up to 90% ee) under mild conditions within shorter reaction time.
N,N'-二氧化物-镍(II)络合物可以有效地催化将环状1,3-二羰基化合物直接不对称迈克尔加成到β,γ-不饱和α-酮酸酯上。在温和的条件下,在较短的反应时间内,以优异的收率(最高99%)和高对映选择性(最高90%ee)获得了一系列手性华法林衍生物。