Remote Sulfonamido Group Enhances Reactivity and Selectivity for Asymmetric Michael Addition of Nitroalkanes to α,β-Unsaturated Aldehydes
作者:Yu-Chao Huang、Biing-Jiun Uang
DOI:10.1002/asia.201402516
日期:2014.9
The pyrrolidine–camphorsulfonamide‐based catalyst 1 a catalyzes the enantioselective conjugate addition of nitroalkanes to α,β‐unsaturated aldehydes in the presence of five equivalents of water in iPrOH to give the corresponding chiral Michael adducts in good yields and high enantioselectivities (up to 99 % ee) with a catalyst loading as low as 1 mol %.
吡咯烷-樟脑磺酰胺基催化剂1 a在i PrOH中存在五当量水的情况下,催化硝基链烷烃向α,β-不饱和醛的对映选择性共轭加成反应,从而以良好的收率和高对映选择性提供相应的手性迈克尔加合物催化剂负载低至1 mol%的99%ee)。