A novel intramolecular Ugi 3CC for the synthesis of N-alkyl-3-oxo-2-aryl-1,2,3,4-tetrahydropyrazino[1,2-a]indole-1-carboxamides
摘要:
An intramolecular Ugi reaction of 2-(2-formyl-1H-indol-1-yl)acetic acid with aryl amines and isocyanides has been developed to produce a novel class of N-alkyl-3-oxo-2-aryl-1,2,3,4-tetrahydropyrazino [1,2-a]indole-1-carboxamides in good yields. This is the first report on intramolecular Ugi three component reaction of 2-(2-formyl-1H-indol-1-yl)acetic acid, aryl amine, and isonitrile. (C) 2012 Elsevier Ltd. All rights reserved.
Highly selective base-catalyzed ring closing Ugi-adducts from the reaction of 2-formylindole, 2-bromoacetic acid, amines and isocyanides
作者:Morteza Shiri、Zahra Bozorgpour-Savadjani
DOI:10.1007/s13738-014-0495-6
日期:2015.3
The intermediate products of the Ugi reaction between indole-2-carboxaldehyde, 2-bromoacetic acid, amines and isocyanides were treated with Cs2CO3 in DMF to form a series of novel cyclized 1,2-dihydropyrazino[1,2-a]indol-3(4H)-ones (indole –NH cyclization) as major and piperazin-2-ones (amide –NH cyclization) as minor products.
在DMF中用Cs 2 CO 3处理吲哚-2-羧醛,2-溴乙酸,胺和异氰酸酯之间的Ugi反应中间产物,形成一系列新型环化的1,2-二氢吡嗪并[1,2- a ]主要产品为indol-3(4 H)-ones(吲哚-NH环化),次要产品为哌嗪-2-ones(酰胺-NH环化)。