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Various base-controlled regioselective reactions of β,γ-unsaturated hydrazones with Selectfluor were achieved under transition metal-free conditions. In the presence of K2HPO4 or NaHCO3, the intramolecular aminofluorination reaction took place readily to give the corresponding monofluoromethylated dihydropyrazoles or fluoro-tetrahydropyridazines, respectively. The possible pathways were proposed based on the experimental results.

Graphical abstract: Transition metal-free aminofluorination of β,γ-unsaturated hydrazones: base-controlled regioselective synthesis of fluorinated dihydropyrazole and tetrahydropyridazine derivatives

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