Bis-1,2,4-triazolo[4,3-a:3′,4′-c]quinoxalines of pharmaceutical interest from 1,3-dipolar cycloaddition
作者:Antonino Lauria、Annalisa Guarcello、Gaetano Dattolo、Anna Maria Almerico
DOI:10.1016/j.tetlet.2008.01.047
日期:2008.3
Various derivatives of the heterocyclic system 1,12,12a,12b-tetrahydrobis-1,2,4-triazolo[4,3-a:3',4'-c]quinoxaline of pharmaceutical interest have been obtained by double site- and regio-selective 1,3-dipolar cycloaddition of arylnitrilimines to quinoxalines. No evidence for the formation of mono-adclucts was obtained, at variance with literature reports. Specific studies to establish the exact stereochemistry of the bis-cycloadducts were undertaken. (C) 2008 Elsevier Ltd. All rights reserved.