Hydrazine hydrate (1:1) → 1-[(2-fluoro-3-pyridinyl)methyl]-1H-pyrazol-3-amine

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Reaction Steps

A mixture of Intermediate 46 (180 mg, 0.558 mmol) and hydrazine monohydrate (FLUKA, 0.035 mL, 1.117 mmol) in ethanol (10 mL) was stirred at room temperature for 4 h. Precipitate was filtered and washed with DCM. Filtrate was evaporated to dryness. Residue was purified by silica column chromatography using a linear gradient of DCM/MeOH as eluents to yield the title compound (102 mg, 0.53 mmol, 95% yield). 1H NMR (300 MHz, DMSO-d6) δ ppm: 8.15 (m, 1H), 7.57-7.62 (m, 1H), 7.45 (d, 1H), 7.29-7.33 (m, 1H), 5.41 (d, 1H), 5.08 (s, 2H), 4.62 (br s, 2H). [ES+MS] m/z 193 (MH+).

Provenance & Evidence