A highly efficient heterogeneous aerobic alcohol oxidation catalyzed by immobilization of bipyridine copper(I) complex in MCM-41
作者:Hong Zhao、Qiurong Chen、Li Wei、Yuanyuan Jiang、Mingzhong Cai
DOI:10.1016/j.tet.2015.09.054
日期:2015.11
aerobic oxidation of primary benzylic and allylic alcohols to aldehydes was achieved under air in EtOH at 50 °C in the presence of 5 mol % of MCM-41-immobilized bipyridine copper(I) complex [MCM-41-bpy-CuI] and 5 mol % of 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) using aqueous ammonia as base, yielding a variety of aromatic and α,β-unsaturated aldehydes in good to excellent yields. This heterogeneous
在50%的EtOH中,空气中,在5 mol%的MCM-41固定联吡啶铜(I)络合物[MCM- 41联吡啶翠]和5%(摩尔)2,2,6,6- tetramethylpiperidine-的ñ以良好至优异的产率使用氨水作为碱,得到各种芳族和α-1-氧基(TEMPO),β不饱和醛。该非均相铜催化剂可通过反应液的简单过滤可以容易地回收和重复使用至少连续10次试验中没有活性的任何降低。可循环使用的非均相铜催化剂和绿色试剂(例如空气作为氧化剂和乙醇作为溶剂)的使用,使该系统对环境可持续性工艺具有吸引力。