Abstract
Three 3,5-disubstituted 1,2,6-thiadiazine 1,1-dioxides have been shown to react with a number of electrophiles affording 4-substituted products. Halogenation, nitrosation, azo-coupling, and Mannich and Vilsmeier reactions have been performed, and nitration was also successful provided that the substrates were N-methylated. N-Methylation was conveniently performed with diazomethane. The behaviour of this heterocyclic sulphone is strikingly analogous to that of 2-pyrimidone.
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