Synthesis of novel heterocyclic fused pyrimidin-4-one derivatives from imino-1,2,3-dithiazoles

Extending the potential applications of 4,5-dichloro-1,2,3-dithiazolium chloride chemistry, we investigated the synthesis of original derivatives of thieno[2,3-d]pyrimidin-4-one system by condensation of alkyl and aromatic diamines with 2-N-iminodithiazolothiophene derivatives. We continued our study for access to novel pyrazolo-and pyrido- fused pyrimidinones using the potential applications of Appel’s salt chemistry.