One-Pot Three-Step Synthesis
of Pyrazinothienopyrimidines Using Tandem Aza-Wittig/Electrocyclic
Ring Closure
作者:José Quintela、Carlos Peinador、Gerardo Blanco、Antonio Fernández-Mato
DOI:10.1055/s-0028-1083318
日期:——
A facile and efficient one-pot procedure for the preparation of pyrazino[3′,2′:4,5]thieno[3,2-d]pyrimidines following a tandem aza-Wittig/electrocyclic ring closure strategy is described. The one-pot, three-step reaction between 3-amino-2-formylthieno[2,3-b]pyrazine, primary amines, dichlorotriphenylphosphine and heterocumulenes, proceeded effectively and the yields of the products were higher than
描述了一种按照串联氮杂-维蒂希/电环闭合策略制备吡嗪并[3',2':4,5]噻吩并[3,2- d ]嘧啶的简便有效的一锅法。3-氨基-2-甲硫基噻吩并[2,3- b ]吡嗪与伯胺,二氯三苯基膦和杂枯烯的一锅三步反应有效地进行,产物的收率高于分步法。产品也可以通过一锅两步反应,使用相同的醛,二氯三苯基膦和异氰酸酯直接制备。本方法的优点是容易获得的起始原料,一锅法的实验简单性和良好的产率。 杂环-维蒂希反应-电环反应-磷腈-环化