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The first‐time reported nitrogen source‐based chemoselectivity of dehydroacetic acid (DHA)‐derived enones has been tuned by isoniazid (INH), and phenylhydrazines respectively. When INH a first‐line antitubercular drug, was employed as a new surrogate for nitrogen source, preferentially unconventional 1,3‐dicarbonyl addition occurred, providing a series of fused 3‐styryl pyrano[2,3‐c]pyrazolones in...