反应详情

Cis-methyl 4-(3-oxo-2,3-dihydroisoxazol-5-yl)-2-(2-(trifluoromethyl)benzyl)piperidine-1-carboxylate (1.30 g, 3.39 mmol) was subjected to chiral preparative HPLC (Column: Chiralcel OJ (250×20), 5 μm particle size, mobile phase: Heptane/EtOH/FA 80/20/0.1, flow rate 18 mL/min) to yield (2R,4S)-methyl 4-(3-oxo-2,3-dihydroisoxazol-5-yl)-2-(2-(trifluoromethyl)benzyl)piperidine-1-carboxylate (597 mg, 46%), Chiral purity 99.6% ee, Optical rotation [α]D20=−4.0 (acetonitrile, c=1) and (2S,4R)-methyl 4-(3-oxo-2,3-dihydroisoxazol-5-yl)-2-(2-(trifluoromethyl)benzyl)piperidine-1-carboxylate (624 mg, 48%), Chiral purity 99.8% ee, Optical rotation [α]D20=+6.1 (acetonitrile, c=1).