Enantioselective aza-Henry reaction of t-Boc protected imines and nitroalkanes with bifunctional squaramide organocatalysts
作者:Dilşad Susam、Cihangir Tanyeli
DOI:10.1039/c6nj04078k
日期:——
An organocatalytic asymmetric aza-Henry reaction of t-Boc protected imines with nitroalkanes has been established by chiral acid–base type bifunctional Cinchona alkaloid/squaramideorganocatalysts. The cooperation of a quinine motif as a base and sterically encumbered squaramide (H-bond donor) enabled mostly complete conversion of a range of reactants into the corresponding aza-Henry products at room
t - Boc保护的亚胺与硝基烷烃的有机催化不对称aza-Henry反应是通过手性酸碱型双功能金鸡纳生物碱/方酰胺有机催化剂建立的。奎宁基序作为碱和空间受限的方酰胺(氢键供体)的配合,可以在室温下以良好的选择性将一系列反应物完全转化为相应的aza-Henry产品(选择性高达91%ee,10 mol)催化剂负载百分比)。