Collect. Czech. Chem. Commun. 1984, 49, 1795-1799

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

Štefan Stankovský and Mária Sokyrová

Department of Organic Chemistry, Slovak Institute of Technology, 812 37 Bratislava


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.