Streamlined access to 2,3-dihydropyrazino[1,2-a]indole-1,4-diones via Ugi reaction followed by microwave-assisted cyclization
摘要:
An efficient method is developed to construct drug-like 2,3-dihydropyrazino[1,2-a]indole-1,4-diones from 1H-indole-2-carboxylic acids, ethyl pyruvate, isocyanides, and primary at-nines via a one-pot, two-step procedure involving Ugi reaction and microwave-assisted cyclization. (C) 2009 Elsevier Ltd. All rights reserved.