Asymmetric Crossed-Conjugate Addition of Nitroalkenes to Enones by a Chiral Bifunctional Diamine Organocatalyst
作者:Min Wang、Lili Lin、Jian Shi、Xiaohua Liu、Yulong Kuang、Xiaoming Feng
DOI:10.1002/chem.201002961
日期:2011.2.18
Cooperative catalysis: An easily available new type of primary–secondary diamine was synthesized as a highly efficient bifunctional catalyst in the asymmetric crossed‐conjugate addition of β,β‐dialkyl nitroalkenes to α,β‐unsaturated acyclic or cyclic ketones for the first time. The wide substrate scope, excellent yield (up to 96 %) and enantioselectivity (up to 99 % enantiomeric excess (ee)) under
协同催化:首次将易于合成的新型伯-仲二胺合成为高效双功能催化剂,将β,β-二烷基硝基烯烃不对称地交叉共轭加成到α,β-不饱和无环或环状酮中。在温和的反应条件下,较宽的底物范围,极佳的收率(高达96%)和对映选择性(对映体过量(ee)高达99%)为形成烯丙基硝基化合物提供了一种潜在的方法(参见方案)。