Synthesis and transformation of 1-monosubstituted tetrazoles to pyrimidinones, benzoxazoles and quinazolinediones through 1,4-disubstituted tetrazolium salts

Synthesis and some new transformations of 1-aryltetrazoles into other heter ocycles through 1,4-disubstituted tetrazolium salts are described. 1-Arylte trazoles, quaternized with tert-butanol and diacetone alcohol in perchloric acid media, gave pure 1,3- or 1,4-disubstituted tetrazolium salts or their mixtures. 1,3-Disubstituted tetrazolium salts are slowly converted into th e corresponding 1,4-salts under dissolving in perchloric acid. I,4-Disubsti tuted tetrazolium salts are recyclized to 2-alkylaminobenzoxazoles, 3-mono- substituted 2,4-quinazolinediones and mixtures of di- and tetrahydropyrimid in-2(1H)-ones in basic conditions.