Preparation of 3-aryl-substituted salicylaldehydes via Suzuki coupling
摘要:
An efficient method for the preparation of 3-arylsalicylaldehydes by palladium-catalyzed cross-coupling reaction of arylboronic acids and 3-bromo-5-tert-butylsalicylaldehyde is described. Parallel catalyst screening allowed rapid optimization of the reaction conditions. (C) 2001 Published by Elsevier Science Ltd.
Enantioselective (3+2) cycloaddition <i>via</i> N-heterocyclic carbene-catalyzed addition of homoenolates to cyclic <i>N</i>-sulfonyl trifluoromethylated ketimines: synthesis of fused N-heterocycle γ-lactams
作者:Zhen-Zhen Zhang、Yongna Zhang、Hui-Xin Duan、Zhuo-Fei Deng、You-Qing Wang
DOI:10.1039/c9cc09269b
日期:——
An enantioselective (3+2) cycloaddition of enals and cyclic N-sulfonyl trifluoromethyl ketimines via N-heterocyclic carbene-catalyzed homoenolateaddition is described. This reaction can efficiently construct fused N-heterocycle γ-lactams bearing two adjacent chiral centers with >20 : 1 dr and 94-99% ee, with one chiral center as a trifluoromethylated α-tetrasubstituted carbon stereocenter.