Synthesis of isoquinoline derivatives of quinoxalin-2-one from pyrrolo[2,1-a]isoquinoline-2,3-diones and o-phenylenediamine
作者:O. V. Surikova、Z. G. Aliev、N. N. Polygalova、A. G. Mikhailovskii、M. I. Vakhrin
DOI:10.1134/s1070428008060201
日期:2008.6
Reactions of 5,5-dialkyl-2,3,4,5-tetrahydropyrrolo[2,1-a]isoquinoline-2,3-diones with o-phenylenediamine in the presence of a catalytic amount of hydrogen chloride or p-toluenesulfonic acid involved opening of the pyrrole ring with formation of 3-(3,3-dialkyl-1,2,3,4-tetrahydroisoquinolin-1-ylidenemethyl)quinoxalin-2(1H)-ones. The presence of an enamine fragment in the products was confirmed by reaction with oxalyl chloride.