Abstract
An efficient synthesis of novel 3-heteroaryl-pyrazoles, which have not been reported hitherto, is described via reactions of ethyl 3-[(E)-3-(N,N-dimethylamino)acryloyl]-1-(4-chlorophenyl)-5-phenyl- 1H-pyrazole-4-carboxylate with hydrazine hydrate, hydroxylamine, various heterocyclic amines, active methylene compounds and diazotized heterocyclic amines. The structures of the compounds prepared were determined by spectral and elemental analyses and alternative syntheses wherever possible.