An efficient and selective synthesis of 1,4‐dihydropyridazines through the acid‐catalyzed recyclization of 5‐hydroxy‐Δ1‐pyrrolines with hydrazines has been developed. The scope of this reaction was thoroughly explored, resulting in the generation of a library of 1,4‐dihydropyridazines in good to excellent yields (25 examples, 67–100 % yields).
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