Asymmetric Triple Relay Catalysis: Enantioselective Synthesis of Spirocyclic Indolines through a One-Pot Process Featuring an Asymmetric 6π Electrocyclization
作者:Xiao-Ping Yin、Xing-Ping Zeng、Yun-Lin Liu、Fu-Min Liao、Jin-Sheng Yu、Feng Zhou、Jian Zhou
DOI:10.1002/anie.201407677
日期:2014.12.8
A rare example of a one‐pot process that involves asymmetric triple relay catalysis is reported. The key step is an asymmetric [1,5] electrocyclic reaction of functionalized ketimines. The substrates for this process were obtained in situ in a two‐step process that involved the hydrogenation of nitroarenes with a Pd/C catalyst to yield aryl amines and their subsequent coupling with isatin derivatives
报道了涉及不对称三重中继催化的一锅法罕见案例。关键步骤是官能化酮亚胺的不对称[1,5]电环反应。此过程的底物是通过两步过程原位获得的,该过程涉及用Pd / C催化剂将硝基芳烃氢化以生成芳基胺,然后在布朗斯台德酸催化的酮亚胺形成反应中将它们与Isatin衍生物偶联。通过双官能手性布朗斯台德碱/氢键供体催化剂催化电环化。一锅法以高收率和出色的对映选择性提供了所需的产物。