An environmentally benign and operationally simple methodology was developed for the regio- and stereoselective synthesis of (Z)-3-methyleneisoindolinones in aqueous micellar medium from 2-iodo-N-phenyl-benzamides and terminal alkyne by Cu-free domino Sonogashira reaction followed by 5-exo-dig-cyclization using Pd(CH3CN)Cl-2 as catalyst and 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene as ligand under aerobic condition. (C) 2012 Elsevier Ltd. All rights reserved.
A ligand-free approach to substituted (<i>Z</i>)-3-methyleneisoindolin-1-ones via Cu (I) catalyzed regio- and stereo-selective assembly of 2-iodo benzamide and terminal alkyne
作者:Rimpa De、Mrinal K. Bera
DOI:10.1080/00397911.2020.1753776
日期:2020.6.17
cost-effective synthesis of substituted 3-methyleneisoindolin -1-ones from 2-iodobenzamide and terminal alkyne under copper (I)-catalyzed condition was accomplished. The reaction affords excellent yield of the product at a relatively lower temperature and exclusive Z-selectivity was observed in the title compound. By varying the substitution pattern on N-atom of benzamide or aromatic core of the alkyne