Abstract
AbstractTreatment of 5‐amino‐1‐(2‐aminophenyl)‐1H‐pyrazole‐4‐carbonitrile (15) with triethyl orthoformate produces 6H‐pyrazolo[2,3‐a][1,3,5]benzotriazepine‐3‐carbonitrile (16). Other members of this novel ring system result from treating 15 with triethyl orthoacetate and triethyl orthopropionate. These latter reactions, which yield homologs 17 and 19, respectively, of 16, also produce acyclic Schiff bases. These Schiff bases are useful in determining the position of the triazepine double bond in pyrazolobenzotriazepines 16,17 and 19, using 13C nmr spectroscopy.
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