Application of the aza-Wittig reaction to the synthesis of pyrazinothienotriazolopyrimidinones: a new tetracyclic ring system
作者:Gerardo Blanco、José M. Quintela、Carlos Peinador
DOI:10.1016/j.tet.2007.11.059
日期:2008.2
A simple one-pot and efficient method is described for the synthesis of pyrazinothienopyrimidines 6 by domino processes involving aza-Wittig/intermolecular nucleophilic addition/intramolecular cyclization. A tandemaza-Wittig reaction of phosphazenes 7, derived from 6, with heterocumulenes (isocyanates, carbon disulfide or carbon dioxide) generates the pyrazinothienotriazolopyrimidinones 9, 11 and
描述了一种简单的一锅有效的方法,该方法用于通过涉及aza-Wittig /分子间亲核加成/分子内环化的多米诺骨牌合成吡嗪酮亚氨基嘧啶6。磷腈的串联氮杂Wittig反应7,衍生自6,与heterocumulenes(异氰酸酯,二硫化碳或二氧化碳)产生pyrazinothienotriazolopyrimidinones 9,11和12,分别。吡唑并[2',3':4,5]噻吩并[3,2 - d ] -1,2,4-三唑并[1,5 - a ]嘧啶-4(3 H)-ones 15和bis(pyrazinothienotriazolopyrimidinones)17通过磷腈7与酰氯或α,ω-二氯化物的分子间aza-Wittig反应,然后通过亚氨酰氯中间体16进行杂环化反应合成了这些化合物。11的进一步S-烷基化和6与光气氯化亚胺的反应分别产生2-烷硫基和2- N,N,N-二甲基氨基吡嗪并噻唑并恶唑并嘧啶酮13和19。