AN UNUSUAL TRANSFORMATION OF 5-AMINO-6-METHYL-3-PHENYL-4 (3H)-PYRIMIDONE WITH SELENIUM DIOXIDE : X-RAY CRYSTAL STRUCTURE OF 3-PHENYLCARBAMOYL-4-METHYL-1, 2, 5-SELENADIAZOLE

Abstract

The reaction of 5-amino-6-methyl-3-phenyl-4 (3H)-pyrimidone (1) with selenium dioxide in dioxane gave the unusual products : 6-phenyl-7 (6H)-isoselenazolo [4, 3-d] pyrimidone (2) and 3-phenylcarbamoyl-4-methyl-1, 2, 5-selenadiazole (3) in the ratio 1 : 2.