Amidinoyl isothiocyanates in the synthesis of condensed quinazolines. Preparation of 3-aryl-5,9-disubstituted s-triazolo[4,3-c]quinazolines

3-Aryl-5-((4-phenyl)piperazinyl)-9-chloro-s-triazolo[4,3-c]quinazolines were prepared by an oxidative cyclization of the corresponding arylhydrazones. The IR and 1H NMR spectra of final products are presented.

Amidinoyl isothiocyanates in the synthesis of condensed quinazolines. Preparation of S-triazolo[4,3-c]quinazolines

The s-triazolo[4,3-c]quinazolines were obtained from 4-hydrazinoquinazolines by condensation with ethyl orthoformate. 4-Hydrazinoquinazoline were prepared by hydrazinolysis of corresponding quinazoline-4-thiones which in turn were obtained by isomerization of amidinoyl isothiocyanates. The infrared and 1H NMR spectra of the final products are interpreted.