Abstract
AbstractReaction 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 13C nmr spectral data.
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