Synthesis of Oxazolo[5,4-<i>d</i>][1,2,4]triazolo[4,3-<i>a</i>]pyrimidines as a New Class of Heterocyclic Compounds
作者:Marzieh Akbarzadeh、Mehdi Bakavoli、Hossein Eshghi、Ali Shiri
DOI:10.1002/jhet.2346
日期:2016.5
Several new derivatives of oxazolo[5,4‐d]pyrimidine (3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h) have been synthesized through the reaction of 2,4‐dichloro‐6‐methyl‐5‐nitropyrimidine (2) with aryl carboxylic acids in refluxing POCl3. Further treatment of compounds (3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h) with hydrazine hydrate gave the hydrazine derivatives (4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h) that were subsequently cyclized
通过2,4-二氯-6-甲基-5-硝基嘧啶的反应合成了恶唑[5,4-d]嘧啶的几种新衍生物(3a,3b,3c,3d,3e,3f,3g,3h) (2)与芳基羧酸在POCl 3中回流。用水合肼进一步处理化合物(3a,3b,3c,3d,3e,3f,3g,3h),得到肼衍生物(4a,4b,4c,4d,4e,4f,4g,4h),随后被环化成新的杂环系统oxazolo [5,4- d ] [1,2,4] triazolo [4,3- a ]嘧啶(5a,5b,5c,5d,5e,5f,5g,5h,5i,5j,5k,5l,5m,5n,5o,5p)和(7a,7b,7c,7d)分别用原酸三乙酯或二硫化碳和卤代烷处理。