Synthesis of cns potentially active bicyclic and tricyclic derivatives of pyrazolo[1,5‐<i>a</i>][1,3]diazepines

Abstract

Abstract Reaction of 5‐ethylamino‐3‐phenylpyrazole with dicarboxylic acid anhydrides in tetrahydrofuran in the presence of 1,3‐dicyclohexylcarbodiimide, afforded bicyclic and tricyclic derivatives of pyrazolo[1,5‐ a ][1,3]‐diazepines. The tricyclic derivatives constitute a new class of compounds. Characterisation of these products was effected with ir, pmr, and 13 C nmr spectral data.