Amidinoyl isothiocyanates in the synthesis of condensed heterocycles: Tetrazolo-azidoazomethine tautomerism in substituted tetrazolo[1,5-c]quinazolines
摘要:
Isomerization of available amidinoyl isothiocyanates has been elaborated into a viable synthetic approach to sec. amine substituted tetrazolo[1,5-c]quinazolines. The method involves isomerization to quinazoline-4-thiones, their hydrazinolysis, followed by a nitrosation to give the title tetrazoloquinazolines. Infrared spectra of both solid samples and their solutions were used to assess the stability of the tetrazole ring.