反应详情

(2R,4S)-Methyl 2-(4-(methylsulfonyl)benzyl)-4-(3-oxo-2,3-dihydroisoxazol-5-yl)piperidine-1-carboxylate (231 mg, 0.59 mmol) was dissolved in HBr (33% in acetic acid, 5 mL, 28.55 mmol) and the mixture was stirred at room temperature overnight. The solvent was evaporated and the residue purified by preparative HPLC (Instrument: FractionLynx II, Mobilphase: gradient 5-95% MeCN in 0.2% NH3, pH 10, Column: Xbridge Prep C18 5 μm OBD 19*150 mm) to yield 5-((2R,4S)-2-(4-(methylsulfonyl)benzyl)piperidin-4-yl)isoxazol-3(2H)-one (171 mg, 87%). 1H NMR (600 MHz, dmso) δ 1.06-1.15 (m, 1H), 1.30-1.39 (m, 1H), 1.76 (d, 2H), 2.43-2.56 (omitted signals), 2.62-2.81 (m, 4H), 2.95-3.00 (m, 1H), 3.16 (s, 3H), 5.68 (s, 1H), 7.46 (d, 2H), 7.80 (d, 2H). HRMS Calcd for [C16H20N2O4S+H]+: 337.1222. Found: 337.1198

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