通过使2-乙炔基苯甲醛和相关的取代的炔基苯甲醛与各种取代的邻苯二胺和脂肪族胺在乙醇中反应,已开发出一种用于合成苯并咪唑并[ 2,1- a ]异喹啉的有效的环境友好途径。该方法提供了一种方便,室温,原子经济且无催化剂的方法,可轻松获得各种取代的异喹啉稠合的苯并咪唑类化合物。通过X射线晶体学证实了该反应的区域选择性,称为邻苯二胺。发现该反应发生在三个主要步骤(亚胺形成,环化和芳构化)中,并提出了一种机理。
Highly efficient Ag(i)-catalyzed regioselective tandem synthesis of diversely substituted quinoxalines and benzimidazoles in water
作者:Vineeta Rustagi、Trapti Aggarwal、Akhilesh K. Verma
DOI:10.1039/c1gc15346c
日期:——
A green and operationally simple approach for the diverse synthesis of fused quinoxalines and benzimidazoles from o-alkynylaldehydes and amines having an N-tethered nucleophile using Ag(I) as the catalyst in water, is described. The X-ray crystallographic studies confirmed the proposed mechanistic pathway and the cyclized product.
Metal-free regioselective tandem synthesis of diversely substituted benzimidazo-fused polyheterocycles in aqueous medium
作者:Pawan K. Mishra、Akhilesh K. Verma
DOI:10.1039/c6gc02330d
日期:——
An operationally simple greener approach for the synthesis of diversely substituted benzimidazo-fused polyheterocycles under the metal-free condition in water has been described. The aqueousmedium accelerates the formation of desired...
One-pot concise syntheses of benzimidazo[2,1-a]isoquinolines by a microwave-accelerated tandem process
作者:Noriko Okamoto、Keisuke Sakurai、Minoru Ishikura、Kei Takeda、Reiko Yanada
DOI:10.1016/j.tetlet.2009.04.126
日期:2009.7
Direct, efficient syntheses of the benzimidazo[2,1-a]isoquinolineringsystem have been achieved with 2-bromoarylaldehydes, terminal alkynes, and 1,2-phenylenediamines by a microwave-accelerated tandem process in which a Sonogashira coupling, 5-endo cyclization, oxidative aromatization, and 6-endo cyclization can be performed in a single synthetic operation.