Partially hydrogenated 2-amino[1,2,4]triazolo[1,5-a]pyrimidines as synthons for the preparation of polycondensed heterocycles: reaction with chlorocarboxylic acid chlorides
作者:Victor M. Chernyshev、Dmitry A. Pyatakov、Andrey N. Sokolov、Alexander V. Astakhov、Eugene S. Gladkov、Svetlana V. Shishkina、Oleg V. Shishkin
DOI:10.1016/j.tet.2013.11.090
日期:2014.1
of partially hydrogenated [1,2,4]triazolo[1,5-a:4,3-a′]dipyrimidin-5-ones and pyrimido[2′,1′:3,4][1,2,4]triazolo[5,1-b]quinazolin-12-ones. It may be more convenient to prepare such compounds through one-pot processes. Some reactions of the synthesized chlorides of polycondensed heterocycles have been studied. Conditions have been found to effect the selective synthesis of free bases, oxidative aromatization
部分氢化的2-氨基- [1,2,4]三唑并[1,5一]嘧啶和2-氨基- [1,2,4]三唑并[5,1- b ]喹唑啉与氯乙酸的氯化物反应,3-氯丙酸和4-氯丁酸在0–5°C下通过2-氨基的酰化反应生成酰胺。在DMF引线在80-90℃加热该相应的3-氯丙衍生物选择性在N-3分子内烷基化形成氯化物的部分氢化[1,2,4]三唑并[1,5一个:4,3-一个'] dipyrimidin -5-酮和嘧啶并[2',1':3,4] [1,2,4]三唑并[5,1- b] quinazolin-12-ones。通过一锅法制备此类化合物可能更方便。已经研究了缩合杂环的合成氯化物的一些反应。已经发现条件影响游离碱的选择性合成,二氢嘧啶循环的氧化芳构化或水解,以及嘧啶酮环的选择性水解裂解或消除。一些所得的化合物代表新的中离子杂环。