反应详情

Trifluoroacetic acid (13.47 mL, 19.94 mmol, 15.0 eq) is added at 0° C. to a stirred solution of trans-4-tert-butoxycarbonylamino-cyclohexanecarboxylic acid methyl ester (3.53 g, 11.66 mmol, 1.0 eq) in dichloromethane (100 mL). After 15 hours stirring at room temperature, the reaction mixture is extracted with dichloromethane (3×50 mL) and water (50 mL) and the pH is adjusted to 12 by the addition of a 1N sodium hydroxide aqueous solution. The combined organic layers are dried over sodium sulfate, filtered and concentrated to afford trans-4-amino-cyclohexanecarboxylic acid methyl ester as a yellow oil (1.53 g, 79% yield).

1. extractionthe reaction mixture is extracted with dichloromethane (3×50 mL) and water (50 mL)
2. additionthe pH is adjusted to 12 by the addition of a 1N sodium hydroxide aqueous solution
3. dry with materialThe combined organic layers are dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated