A simple one pot synthesis of condensed 1,2,4-triazines by using the tandem a<sub>N-</sub>S<sub>N</sub><sup>ipso</sup>and S<sub>N</sub><sup>H</sup>-S<sub>N</sub><sup>ipsa</sup>reactions
作者:Oleg N. Chupakhin、Gennady L. Rusinov、Dmitry G. Beresnev、Valery N. Charushin、Hans Neunhoeffer
DOI:10.1002/jhet.5570380414
日期:2001.7
A new synthetic approach to condensed 1,2,4-triazines based on using the tandem AN-SNipso and SNH-SNipso reactions has been developed. 5-Methoxy-3-penyl-1,2,4-triazine and its N1-methyl quaternary salt were found to react with C,N-, C,O- and N,N'-bifunctional nucleophiles (m-phenylenediamine, resor-cinol, semicarbazide and ureas) into triazacarbazoles, benzofuro[2,3-e][1,2,4]-triazines, and 6-azapurine
基于串联的A N -S N ipso和S N H -S N ipso反应,开发了一种新的合成方法缩合1,2,4-三嗪。5-甲氧基-3- penyl -1,2,4-三嗪及其Ñ 1 -甲基季盐被发现与C,N-,C,O-和反应N,N” -bifunctional亲核试剂(米苯二胺,间苯二酚,氨基脲和脲)变成三氮杂咔唑,苯并呋喃[2,3- e] [1,2,4]-三嗪和6-氮杂嘌呤衍生物。在所有情况下,亲核试剂首先攻击三嗪环的未取代的C-6碳,而最后阶段是取代甲氧基,从而提供环化产物。