Ring contraction in reactions of 3-benzoylquinoxalin-2-ones with 1,2-phenylenediamines. Quinoxaline-benzoimidazole rearrangement
作者:V. A. Mamedov、A. A. Kalinin、A. T. Gubaidullin、A. V. Chernova、I. A. Litvinov、Ya. A. Levin、R. R. Shagidullin
DOI:10.1023/b:rucb.0000024846.27508.76
日期:2004.1
The reactions of 3-benzoylquinoxalin-2-one and its N(1)-alkyl derivatives with 1,2-phenylenediamines were accompanied by ringcontraction as a result of the quinoxaline-benzoimidazole rearrangement giving rise to 2-benzoimidazolyl-substituted quinoxalines. The possible pathways of these reaction are discussed.
An efficient method for the synthesis of imidazo[1,5-a]quinoxalines from 3-acylquinoxalinones and benzylamines via a novel imidazoannulation
作者:Vakhid A. Mamedov、Aleksey A. Kalinin、Alsu A. Balandina、Il'dar Kh. Rizvanov、Shamil K. Latypov
DOI:10.1016/j.tet.2009.08.081
日期:2009.11
The reaction of 3-aroylquinoxalin-2(1H)-ones and their N-alkyl analogues with benzylamines in DMSO proceeds through an intermediate formation of N-(alpha-quinoxalinylbenzylydene)benzylamine, which when subjected to oxidative cyclocondensation gives imidazo[1,5-a]quinoxalines. Applying this new approach of imidazoannullation to the bis-3-aroylquinoxalines makes it possible to develop fundamentally new methods of the synthesis of bis-imidazo[1,5-a]quinoxalines with the use of different benzylamines and heteromacrocycles with the 1,3-bis(3-arylimidazo[1,5-a]quinoxalin-1-yl)benzene structural fragment when m-xylylenediamine is used. (c) 2009 Elsevier Ltd. All rights reserved.
Polyfused nitrogen heterocycles: XIX. Oxidative imidazo-fusion of 3-benzoylquinoxalin-2-ones with benzylamines in the synthesis of bis(imidazo[1,5-a]quinoxalin-1- and -5-yl) derivatives
作者:A. A. Kalinin、V. A. Mamedov
DOI:10.1134/s1070428008050187
日期:2008.5
Oxidative cyclocondensation of bis(3-benzoylquinoxalin-1-yl)alkanes and oxaalkanes with benzylamine and 3-benzoylquinoxalinones with m-xylylenediamine proceeded with the formation of bis-(imidazo[1,5-a]quinoxalinyl) derivatives where the hetaryl fragments were linked by a spacer both through the imidazole and quinoxaline fragments.