A New Route to Substituted Pyrimido[5,4-e]-1,2,4-triazine-5,7(1H,6H)-diones and Facile Extension to 5,7(6H,8H) Isomers
作者:H. Showalter、Anjanette Turbiak
DOI:10.1055/s-0029-1217030
日期:2009.12
pyrimido[5,4-e]-1,2,4-triazine-5,7(1H,6H)-diones is outlined. The synthesis proceeds via pre-formed hydrazone intermediates, which are then condensed with an activated chlorouracil to build up the entire molecular framework, followed by a reductive ring closure to provide the parent series. The route has been extended to the isomeric pyrimido[5,4-e]-1,2,4-triazine-5,7(6H,8H)-dione class via the use of methylhydrazine
概述了取代嘧啶并[5,4-e]-1,2,4-三嗪-5,7(1H,6H)-二酮的新途径。合成通过预先形成的腙中间体进行,然后将其与活化的氯尿嘧啶缩合以建立整个分子框架,然后进行还原闭环以提供母体系列。通过使用甲基肼作为肼替代物,该路线已扩展到异构嘧啶并[5,4-e]-1,2,4-三嗪-5,7(6H,8H)-二酮类,然后进行区域特异性烷基化具有一系列烷基和烷芳基取代基的 N(8)-H 嘧啶并三嗪二酮。这种新方法允许在 N(1)、C(3) 和 N(8) 位置生成各种具有可变替换的化合物,用于具有证明药理活性的杂环支架。