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■ Conjugate Addition Reactions of Some Methylidene 1-Benzylpyrimidinetrione Derivatives

Essam Abdelghani

*Chemistry Department, College of Science, King Khalid Universitya, P.O. Box 9004, [97], Abha, Saudi Arabia

Abstract

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 POCl₃ 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 Ac₂O.