Hydrochloric Acid → (4-Bromo-1-methyl-1H-pyrazol-3-yl)-1-piperazinylmethanone

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Reaction Steps

4-(4-Bromo-1-methyl-1H-pyrazole-3-carbonyl)-piperazine-1-carboxylic acid tert-butyl ester (800 mg, 2.14 mmol) from Step A and HCl in dioxane (4 N, 5.36 mL) was stirred at room temperature for 1 h. The solvent was removed under reduced pressure to afford the hydrochloride salt of the title compound (585 mg) as a light yellow solid. 1H NMR (Acetonitrile-d3, 400 MHz) δ 3.20-3.26 (m, 4H), 3.92 (s, 3H), 3.98-4.05 (m, 4H), 7.71 (s, 1H), 9.40-9.50 (bs, 2H). Exact mass calculated for C9H13BrN4O: 272.0. Found: LCMS m/z (%)=273.0 (M+H+79Br, 100%), 275.0 (M+H+81Br, 97%).

Provenance & Evidence