反应详情

tert-Butyl 2-(6-bromo-4-oxo-3,4-dihydrothieno[3,2-d]pyrimidin-2-yl)-2-methylpyrrolidine-1-carboxylate (180 mg) was fractionated by high performance liquid chromatography (column: CHIRALPAK AD (50 mm i.d.×500 mm L, manufactured by DAICEL CHEMICAL INDUSTRIES, LTD.), mobile phase: hexane/ethanol (900/100), flow rate: 80 mL/min, column temperature: 30° C.). Under the above-mentioned high performance liquid chromatography conditions, the fraction solution containing an optically active form having a shorter retention time was concentrated to give tert-butyl (2R)-2-(6-bromo-4-oxo-3,4-dihydrothieno[3,2-d]pyrimidin-2-yl)-2-methylpyrrolidine-1-carboxylate (88 mg, 9.25 min, >99.9% ee). In addition, the fraction solution containing an optically active form having a longer retention time was concentrated to give tert-butyl (2S)-2-(6-bromo-4-oxo-3,4-dihydrothieno[3,2-d]pyrimidin-2-yl)-2-methylpyrrolidine-1-carboxylate (85 mg, 19.3 min, >99.9% ee). The analysis was performed by high performance liquid chromatography (column: CHIRALPAK AD (4.6 mm i.d.×250 mm L, manufactured by DAICEL CHEMICAL INDUSTRIES, LTD.), mobile phase: hexane/ethanol (900/100), flow rate: 1.0 mL/min, column temperature: 30° C., detection 220 nm). The absolute configuration was determined by comparison to tert-butyl (2S)-2-(6-bromo-4-oxo-3,4-dihydrothieno[3,2-d]pyrimidin-2-yl)-2-methylpyrrolidine-1-carboxylate produced in Example 103, step A.