Acetic Acid → 2-Chloro-4-fluoro-N-(3-(1-methylpiperidin-4-ylamino)phenyl)benzamide dihydrochloride

Participants

Reaction Steps

Combine 2-chloro-4-fluoro-N-(3-aminophenyl)benzamide (Preparation 1, 200 mg, 0.756 mmol), 1-methylpiperidin-4-one (0.093 mL, 0.756 mmol), sodium triacetoxyborohydride (208 mg, 0.982 mmol), acetic acid (0.043 mL, 0.756 mmol) and dichloromethane (8 mL). Stir at room temperature overnight. Dilute with dichloromethane (5 mL) and wash twice with sodium hydroxide (10 mL 1N aq.). Combine the organic layers and wash with saturated aqueous NaCl (10 mL). Dry over magnesium sulfate, filter under reduced pressure and concentrate to dryness. Purify by flash chromatography on a Biotage® silica cartridge eluting with a 20/1 mixture of dichloromethane and 2N ammonia in methanol to give the free base of the title compound (239 mg, 87%). Dissolve the residue in diethyl ether and treat with ethereal hydrogen chloride. Triturate the resulting gum with ether to give the title compound as a white solid (31 mg): mp 180° C.; mass spectrum (free base, ion spray): m/z=362.1(M+1), 1H NMR (free base, CDCl3): 7.80–7.75 (m, 2H), 7.23 (bs, 1H), 7.19 (dd, J=2.4 Hz, 8.3 Hz, 1H), 7.13 (t, J=8.2 Hz, 1H), 7.08 (dd, J=2.4 Hz, 8.3 Hz, 1H), 6.67 (d, J=7.8 Hz, 1H), 6.41 (dd, J=2.0 Hz, 8.3 Hz, 1H), 3.68 (bd, J=7.9 Hz, 1H), 3.36 (bs, 1H), 2.92–2.81 (bm, 2H), 2.35 (s, 3H), 2.82–2.17 (bm, 2H), 2.10 (bd, J=13.0 Hz, 2H), 1.64–1.51 (bm, 2H). Analysis calc'd for C19H23Cl3FN3O: C, 51.95; H, 5.39; N, 9.57. Found: C, 52.03; H, 5.46; N, 9.17.

Provenance & Evidence