Polycondensed nitrogen heterocycles. Part <b>17</b>. Isoxazolo[4,3‐<i>d</i>]pyrazolo[3,4‐<i>f</i>][1,2,3]triazepine. A new ring system

Abstract

Abstract The title compounds were prepared by nitration of compounds 2 , reduction of the dinitro derivatives 4 and diazotization of the diamino derivatives 6 followed by an intramolecular coupling reaction. Compound 4a showed good activity against Salmonella cholerasuis and Clostridium perfringens bacteria.