A new synthesis of 2,8-disubstituted pyrazolo[4,3-e][1,2,4]triazolo[1,5-c]pyrimidines
作者:Anton V. Dolzhenko、Giorgia Pastorin、Anna V. Dolzhenko、Wai Keung Chui
DOI:10.1016/j.tetlet.2009.07.113
日期:2009.10
5-c]pyrimidines, which are key intermediates in the preparation of adenosine receptor antagonists, is developed. The method allows introduction of a variety of aryl substituents at position 2 of the pyrazolo[4,3-e][1,2,4]triazolo[1,5-c]pyrimidine system via cyclocondensation of 5-amino-4-iminopyrazolo[3,4-d]pyrimidine with benzaldehydes accompanied with oxidation by iodobenzene diacetate. Some unexpected
开发了实用的吡唑并[4,3- e ] [1,2,4]三唑并[1,5- c ]嘧啶的合成方法,它们是制备腺苷受体拮抗剂的关键中间体。该方法允许通过5-氨基-4-亚氨基吡唑并环缩合在吡唑并[4,3- e ] [1,2,4]三唑并[1,5- c ]嘧啶体系的2位引入各种芳基取代基。[3,4- d ]嘧啶与苯甲醛并伴随有碘代二苯乙酸酯的氧化。观察到一些意想不到的反应,并使用NMR光谱和X射线晶体学证实了产物的结构。