A rapid and facile synthesis of new spiropyrimidines from 5-(2-arylethylidene-2-oxo)-1,3-dimethylpyrimidine-2,4,6-triones
摘要:
A series of new tetraazaspiro[5,5]-undec-4-ene-2,7,9,11-tetraones have been obtained by reaction of 5-(2-arylethylidene-2-oxo)-1,3-dimethylpyrimidine-2,4,6-triones with ureas. A three-component one-pot procedure to the spiranes synthesis was also developed. One-pot reaction of arylglyoxals, 1,3-dimethylbarbituric acid, and diniethylurea led to imidazolyl-1,3-dimethylbarbituric acids. Mechanisms of studied reactions were discussed. (c) 2008 Elsevier Ltd. All rights reserved.
吡唑并[3,4- b ]喹啉-5-酮和吡唑并[4',3':5,6]吡啶并[2,3 - d ]嘧啶-5,7-二酮衍生物的无催化剂合成-锅三成分反应
摘要:
在本文中,我们报告了通过环缩合反应合成吡唑并[3,4- b ]喹啉-5-酮和吡唑并[4',3':5,6]吡啶[2,3 - d ]嘧啶-5,7-二酮衍生物。在无催化剂条件下于H 2 O / EtOH中回流下的1,3-二酮,3-甲基-1-苯基-1 H-吡唑-5-胺和芳基乙二醛的产率为65–98%和73–96%分别。该方案提供了温和的反应条件,良好的高收率,非催化的,简单的操作以及易于将产物分离为结构上不同的三环吡唑并[3,4- b ]喹啉-5-酮和吡唑并[4',3':5 ,6] pyrido [2,3 - d ] pyrimidin-5,7-dione衍生物,可能具有生物学和药理活性。