Copper(I) phosphoramidite catalyzed asymmetric conjugate addition of dialkylzinc reagents of α,β-unsaturated nitroacetates; an enantioselective route to β-aryl-nitroalkanes
作者:Jos P.G. Versleijen、Albert M. van Leusen、Ben L. Feringa
DOI:10.1016/s0040-4039(99)01118-1
日期:1999.7
The asymmetric copper(I) phosphoramidite catalyzed conjugate addition of dialkylzinc reagents to E,Z-mixtures of α,β-unsaturated nitroacetates provided the 1,4-adducts in excellent yields but with low e.e.'s. High enantioselectivities (e.e.'s up to 92%) were obtained with structurally rigid 3-nitrocoumarins, leading to a new route to optically active β-aryl-nitroalkanes.
不对称铜(I)亚磷酰胺催化将二烷基锌试剂共轭加成到α,β-不饱和硝基乙酸酯的E,Z混合物中,从而以优异的收率提供1,4加合物,但ee较低。使用结构刚性的3-硝基香豆素可实现高对映选择性(ee高达92%),从而开辟了一种新的制备旋光性β-芳基-硝基烷烃的途径。