Methanol → HCID 86672815, compound

Participants

Reaction Steps

Thionyl chloride (7.5 mL, 102.7 mmol) was added dropwise to a suspension of 3-hydroxy-1,2-dimethyl-5-(2,2,2-trifluoro-1-hydroxyethyl)pyridin-4(1H)-one (3.00 g, 12.7 mmol) and acetonitrile (110 mL) with external cooling using a tap water bath under a blanket of nitrogen. The progress of the reaction was monitored by TLC (eluant: methanol:dichloromethane, 1:10, v:v). After the addition of SOCl2, a clear solution resulted, and white solid gradually formed upon further stirring. The reaction mixture was concentrated repeatedly in acetonitrile to give a solid, which was then collected and washed with acetonitrile (15 mL×2). Thus, 5-(1-chloro-2,2,2-trifluoroethyl)-3-hydroxy-1,2-dimethylpyridin-4(1H)-one hydrochloride, was obtained as a white solid (2.89 g). Yield=78%; 1H NMR (DMSO-D6) δ (ppm): 8.17 (s, 1H), 6.19 (q, J=7.5 Hz, 1H), 3.84 (s, 3H), 2.35 (s, 3H). (c) A mixture of 5-(1-chloro-2,2,2-trifluoroethyl)-3-hydroxy-1,2-dimethylpyridin-4(1H)-one hydrochloride (395 mg, 1.4 mmol) and acetonitrile (30 mL) was added to a 40 wt % dimethylamine in water (3.5 mL, 27.7 mmol). The resulting yellowish solution was stirred vigorously, and the progress of the reaction was monitored by TLC (eluant: methanol/dichloromethane, 1/10, v/v). The starting material was completely consumed within 5 min. The reaction mixture was concentrated to give a solid. The solid was dissolved in dichloromethane (30 mL), which was then washed with a 10% ammonium chloride solution (15 mL×2). The organic phase was dried over sodium sulfate, filtered, and concentrated to give 5-[1-(dimethylamino)-2,2,2-trifluoroethyl]-3-hydroxy-1,2-dimethylpyridin-4(1H)-one (Apo7053) as a solid product (200 mg). Yield=56%; HPLC Method 1, RT=10.2 min, HPLC purity (AUC): 98.3% at 280 nm); 1H NMR (DMSO-D6) δ (ppm): 7.68 (s, 1H), 4.86 (q, J=10.1 Hz, 1H), 3.73 (s, 3H), 2.29 (s, 3H), 2.23 (s, 6H). MS-ESI m/z 265 [M+1]+, 220 (100%), 192.

Provenance & Evidence