A general, highly enantioselective Michael addition of nitroalkanes to α,β-unsaturated enones catalyzed by 9-amino(9-deoxy)-epi-quinine: a remarkable additive effect
作者:Siyang Liu、Qingqing Wang、Ling Ye、Zhichuan Shi、Zhigang Zhao、Xuejun Yang、Keyi Ding、Xuefeng Li
DOI:10.1016/j.tet.2016.07.008
日期:2016.8
A particularly general protocol for the organocatalytic asymmetric Michael addition of nitroalkanes to α,β-unsaturated enones is reported. The Michael reaction proceeded smoothly and provided the desired adducts in moderate to excellent yields (55–99%) and good to excellent enantioselectivities (65–99% ee). The addition of readily available achiral base significantly enhanced the reactivity without
报道了一种特别通用的方案,用于将硝基烷烃有机催化不对称迈克尔加成到α,β-不饱和烯酮上。迈克尔反应进展顺利,并以中等至优异的收率(55-99%)和良好至优异的对映选择性(65-99%ee)提供了所需的加合物。容易获得的非手性碱的加入显着增强了反应性,而没有损害对映选择性。