The selective synthesis of (Z)‐ or (E)‐3‐aryl/vinyl/alkylidene‐isoindolones, and 2‐benzopyran derivatives from o‐(1‐alkynyl)benzamides by means of a suitable choice of bases or silver catalysis is described.
A Highly Regio and Stereoselective Synthesis of (<i>Z</i>)-3-Aryl(alkyl)idene Isoindolin-1-ones via Palladium Catalyzed Annulation of Terminal Alkynes
作者:M. Khan、Nitya Kundu
DOI:10.1055/s-1997-1049
日期:——
o-Iodobenzamide or its N-substituted derivatives 4-10 and terminal alkynes 11-17 reacted in DMF in the presence of bis(triphenylphosphine)palladium(II)chloride, cuprous iodide and triethylamine leading to (Z)-3-arylidene isoindolin-1-ones (22, 24, 27 and 28) or o-alkynyl N-substituted benzamides (I). The latter could be cyclised with sodium in ethanol in a completely regio and stereoselective manner to (Z)-3-aryl(alkyl)idene isoindolin-1-ones 18-35.
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
Copper(II)-Catalyzed Tandem Synthesis of Substituted 3-Methyleneisoindolin-1-ones
作者:Jie Pan、Zhen Xu、Runsheng Zeng、Jianping Zou
DOI:10.1002/cjoc.201300346
日期:2013.8
AbstractAn efficient strategy for the synthesis of a variety of 3‐methyleneisoindolin‐1‐ones has been developed. The reaction proceeded from coupling of 2‐iodobenzamides (or 2‐bromobenzamides) and terminal alkynes via Cu(OAc)2·H2O/2,2′‐biimidazole catalyzed in DMF at 60°C and subsequent additive cyclization produced substituted 3‐methyleneisoindolin‐1‐ones in good to excellent yields.
Palladium-Catalysed Heteroannulation with Terminal Alkynes: a Highly Regio- and Stereoselective Synthesis of (Z)-3-Aryl(alkyl)idene Isoindolin-1-ones
作者:Nitya G Kundu、M.Wahab Khan
DOI:10.1016/s0040-4020(00)00359-8
日期:2000.6
A highly regio- and stereoselective method for the synthesis of (Z)-3-aryl(alkyl)idene isoindolin-1-ones through palladium-copper catalysis is described. 2-Iodobenzamide 1 and its substituted derivatives 2-10 were reacted with terminal alkynes 11-19 in the presence of (PPh3)(2)PdCl2, CuI, and Et3N in DMF mostly at 80 degrees C for 16 h to yield the 2-alkynyl substituted benzamides 20-38, 40-45, 77 which could then be cyclised with NaOEt in EtOH to the 3-aryl(alkyl)idene isoindolin-1-ones 46-49, 51, 53-55, 57, 59-71, 73 and 75. In certain cases, the isoindolin-1-ones 50, 52, 56 and 58 could be directly obtained by the palladium-catalysed reactions. (C) 2000 Elsevier Science Ltd. All rights reserved.