A facile synthesis of 2,6-disubstituted pyrimidin-4-ones and 2,5,6-trisubstituted pyrimidin-4-ones from commercially available materials with application of microwave technology in key steps is described. (C) 2009 Elsevier Ltd. All rights reserved.
A Convenient Synthesis of 5- and 6-Substituted 2-Phenyl-3<i>H</i>-pyrimidin-4-ones
A simple and convenient one-pot procedure for the synthesis of 5- and 6-substituted 2-phenyl-3 H-pyrimidin-4-ones by the condensation of 4-alkoxy-1,1,1-trichloroalk-3-en-2-ones with benz-amidine hydrochloride is described.
Three methods for the regiospecific bromination of 2-phenyl-3H-pyrimidin-4-ones are presented: bromination of the 5-position of the pyrimidine ring, bromination of the 6-benzylic position and simultaneous bromination of both the 5-position of the pyrimidine ring and 6-benzylic position. Reactions were carried out using simple protocols and the brominated pyrimidines were obtained in good yields.