Catalyst-free ambient temperature synthesis of isoquinoline-fused benzimidazoles from 2-alkynylbenzaldehydes <i>via</i> alkyne hydroamination
作者:Manisha Mishra、Dylan Twardy、Clifford Ellstrom、Kraig A. Wheeler、Roman Dembinski、Béla Török
DOI:10.1039/c8gc02520g
日期:——
route for the synthesis of benzimidazo[2,1-a]isoquinoline has been developed by reacting 2-ethynylbenzaldehyde and related substituted alkynylbenzaldehydes with variously substituted ortho-phenylenediamines and aliphatic amines in ethanol. This method provides a convenient, room temperature, atom-economical, and catalyst-free access to diversely substituted isoquinoline fused benzimidazoles. Regioselectivity
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。