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
A highly efficient strategy for the kinetic resolution of Michael adducts was realized using a chiral N‐heterocyclic carbene catalyst. The kinetic resolution provides a new convenient route to single diastereomers of cyclohexenes and Michael adducts in good yields with high enantiomeric excesses (up to 99 % ee with a selectivity factor of up to 458). This “two flies with one swat” concept allows the
An active and selective heterogeneous catalytic system for Michael addition
作者:Hoda Keipour、Mohammad A. Khalilzadeh、Abolfazl Hosseini、Afsaneh Pilevar、Daryoush Zareyee
DOI:10.1016/j.cclet.2012.02.006
日期:2012.5
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.