An active and selective heterogeneous catalytic system for Michael addition
摘要:
Potassium fluoride doped natural zeolite was found to be an efficient and selective solid base catalyst for 1,4-Michael addition. The catalyst is easily prepared and the workup procedure simplified by simple filtration. All products were obtained in high yields as well as short reaction times. (C) 2012 Mohammad A. Khalilzadeh. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
A dynamic kinetic asymmetric transfer hydrogenation–cyclization tandem reaction: an easy access to chiral 3,4-dihydro-2H-pyran-carbonitriles
作者:Dongsong Zheng、Qiankun Zhao、Xiaoying Hu、Tanyu Cheng、Guohua Liu、Wei Wang
DOI:10.1039/c7cc02156a
日期:——
(mesitylene)RuCl(monosulfonated diamine) catalysed dynamickineticresolution (DKR)–asymmetric transfer hydrogenation (ATH) process is developed for highly enantio- (up to 99% ee) and diastereo- (up to 98:2 dr) selective reduction of challenging racemic α-aryl-γ-keto malononitriles. A spontaneous cyclization reaction of the hydrogenation products delivers a cascadeprocess for efficient synthesis of useful enantioenriched