反应详情

A solution of 1-tert-butyl 3-methyl 4-allylpiperidine-1,3-dicarboxylate [WO2002/072572] (715 mg, 2.53 mmol) in tetrahydrofuran (5 mL) at 0° C. was treated with a solution of 9-BBN in tetrahydrofuran (0.5M, 10.2 mL, 5.1 mmol). After one hour the reaction mixture was allowed to warm to room temperature for 3 hours. The reaction mixture was cooled to 0° C. and treated with water (3 mL), NaOH (3N, 6 mL) and hydrogen peroxide (30% solution, 6 mL). The reaction was allowed to warm to room temperature and stir for one hour. The reaction was diluted with ethyl acetate and water. The layers were separated. The aqueous layer was extracted twice with ethyl acetate. The combined organic layers were dried over magnesium sulfate and concentrated at reduced. Chromatography on silica gel with methanol in dichloromethane (0-10%) gave the product as a colorless oil as a mixture of diastereomers (460 mg, 60%).

1. temperatureThe reaction mixture was cooled to 0° C.
2. temperatureto warm to room temperature
3. customThe layers were separated
4. extractionThe aqueous layer was extracted twice with ethyl acetate
5. dry with materialThe combined organic layers were dried over magnesium sulfate
6. concentrationconcentrated at reduced