Intermolecular aza‐wittig reaction: One‐step synthesis of pyrazolo[1,5‐a]pyrimidine and imidazo[1,2‐b]pyrazole derivatives

Pyrazolo1,5‐a]pyrimidine and imidazo1,2‐b]pyrazole derivatives were synthesized via intermolecular aza‐Wittig reaction of 5‐(triphenylphosphoranylideneamino)‐3‐phenylpyrazole 3 derived from 5‐amino‐3‐phenylpyrazole with some selected α‐chloroketones.