Conjugate Addition Reactions of Some Methylidene 1-Benzylpyrimidinetrione Derivatives
作者:Essam Abdelghani
DOI:10.3987/com-01-9348
日期:——
1-Benzyl-2,4,6-pyrimidinetrione (1) reacts at C-5 with aldehydes and the isolated products can easily undergo base-induced transformations by Michael addition. On the contrary,the action of POCl 3 or piperidine/AcOH on the title trione afforded pyrimido[4,5:4,5]furo[2,3-d]pyrimidine (16) and a dimer (17), respectively, which in turn, undergo cyclocondensation in Ac 2 O.
1-Benzyl-2,4,6-pyrimidinetrione (1) 在 C-5 处与醛反应,分离的产物很容易通过迈克尔加成进行碱诱导转化。相反,POCl 3 或哌啶/AcOH对标题三酮的作用分别得到嘧啶并[4,5:4,5]呋喃[2,3-d]嘧啶(16)和二聚体(17),依次在 Ac 2 O 中进行环缩合反应。