Organocatalyzed asymmetric vinylogous Michael addition of α,β-unsaturated γ-butyrolactam
作者:Jinlong Zhang、Xihong Liu、Xiaojuan Ma、Rui Wang
DOI:10.1039/c3cc44059a
日期:——
Highly efficient asymmetric vinylogous 1,6-Michael addition of α,β-unsaturated γ-butyrolactam to 3-methyl-4-nitro-5-alkenyl-isoxazoles and Michael addition to trichloromethyl ketones by using a chiral quinine-derived squaramide organocatalyst were described, giving products with high diastereo- and enantioselectivities (up to >25â:â1 dr and 96% ee).
高效不对称亲核1,6-迈克尔加成反应:α,β-不饱和γ-丁内酯与3-甲基-4-硝基-5-烯基异恶唑及与三氯甲基酮的迈克尔加成反应,采用手性奎宁衍生亚磺酰胺有机催化剂,产物具有高度的非对映选择性和对映选择性(最高可达>25:1的dr和96%的ee)。