Lactate-Based Ionic Liquid Catalyzed Reductive Amination/Cyclization of Keto Acids under Mild Conditions: A Metal-Free Route To Synthesize Lactams
作者:Cailing Wu、Hongye Zhang、Bo Yu、Yu Chen、Zhengang Ke、Shien Guo、Zhimin Liu
DOI:10.1021/acscatal.7b02231
日期:2017.11.3
lactate, [BMIm][Lac]) catalyzed reductive amination/cyclization of keto acids using triethoxysilane as a reducing agent, which provides a metal-free route to synthesis of lactams under mild conditions, even at roomtemperature. [BMIm][Lac] combined with (EtO)3SiH afforded a series of five- and six-membered lactams in good to excellent yields at 80 °C within 1 h, showing comparable performance to the best
Catalytically active iridacycles are formed by cyclometalation of acetophenone imines with Ir–PHOX complexes under hydrogen atmosphere. These complexes show unusually high reactivity and enantioselectivity in the hydrogenation of alkyl methyl ketimines. The structure of the cyclometalated imine has a strong effect on the conversion and enantiomeric excess.