反应详情

N-[2-(2-Methyl-2,6,7,8-tetrahydrocyclopenta[e]indazol-8-yl)ethyl]acetamide (about 70 mg) was fractionated by high performance liquid chromatography (instrument: Prep LC 2000 (manufactured by Nihon Waters K.K.), column: CHIRALPAK AD (50 mm ID×500 mm L, manufactured by Dicel Chemical Industries, Ltd.), mobile phase: hexane/ethanol=90/10, flow rate: 80 mL/min, column temperature: room temperature, sample concentration: 1.0 mg/mL (hexane/ethanol=90/10), injection amount: about 35 mg). A fraction solution containing an optically active compound having a longer retention time under the above-mentioned high performance liquid chromatography conditions was concentrated. The concentrate was re-dissolved in ethanol, and concentrated to dryness. Hexane was further added, and the mixture was concentrated to dryness again to give the title compound (36 mg, 99% ee). The enantiomer excess (ee) was measured by high performance liquid chromatography (column: CHIRALPAK AD-H (4.6 mm ID×250 mm L, manufactured by Dicel Chemical Industries, Ltd.), mobile phase: hexane/ethanol=90/10, flow rate: 1.0 mL/min, column temperature: room temperature, sample concentration: 1 mg/mL (hexane/ethanol=90/10), injection volume: 10 μL).

1. additionA fraction solution containing an optically active compound
2. concentrationwas concentrated
3. dissolutionThe concentrate was re-dissolved in ethanol
4. concentrationconcentrated to dryness
5. additionHexane was further added
6. concentrationthe mixture was concentrated to dryness again