反应详情

(2S,4R)-Methyl 4-(3-oxo-2,3-dihydroisoxazol-5-yl)-2-(2-(trifluoromethyl)benzyl)piperidine-1-carboxylate (624 mg, 1.62 mmol) was dissolved in hydrogen bromide (33% in acetic acid, 10 mL, 57.10 mmol) and the mixture stirred at room temperature overnight. The solvent was evaporated and the residue purified by preparative HPLC (Instrument: FractionLynx III, Mobilphase: gradient 5-95% MeCN in 0.2% NH3, pH 10, Column: Xbridge Prep C18 5 μm OBD 19*150 mm) to yield 5-((2S,4R)-2-(2-(trifluoromethyl)benzyl)piperidin-4-yl)isoxazol-3(2H)-one (359 mg, 68%). 1H NMR (600 MHz, cd3od) δ 1.68 (q, 1H), 1.84 (dq, 1H), 2.11 (d, 1H), 2.22 (d, 1H), 3.04-3.19 (m, 3H), 3.23-3.30 (m, 4H), 3.49-3.54 (m, 1H), 3.59-3.66 (m, 1H), 5.74 (s, 1H), 7.48 (t, 1H), 7.52 (d, 1H), 7.64 (t, 1H), 7.74 (d, 1H). HRMS Calculated for [C16H17F3N2O2+H]+: 327.1320. Found: 327.1321

1. customThe solvent was evaporated
2. customthe residue purified by preparative HPLC (Instrument: FractionLynx III, Mobilphase: gradient 5-95% MeCN in 0.2% NH3, pH 10, Column: Xbridge Prep C18 5 μm OBD 19*150 mm)