反应详情

温度

25 °C

(1R,2S)-2-Amino-cyclohexanecarboxylic acid methyl ester (1 g, 6.4 mmol) was dissolved in methanol (70 mL). 4-Fluoro-benzaldehyde (0.794 g, 6.4 mmol) was added followed by acetic acid (1 mL). The solution was stirred at 25° C. for 10 min. Sodium cyanoborohydride (1 g, 16 mmol) was added and the mixture was stirred at 25° C. for 16 h. The mixture was poured into 1/2 saturated aqueous sodium bicarbonate solution (150 mL). The aqueous layer was extracted with ethyl acetate (2×150 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo to afford the crude product, (1R,2S)-2-(4-fluoro-benzylamino)-cyclohexanecarboxylic acid methyl ester (0.8 g, 3 mmol, 47%), as a light yellow oil. LC-MS (ESI) calcd for C15H20FNO2 265.15, found 266.2 [M+H+].

1. stirringthe mixture was stirred at 25° C. for 16 h
2. extractionThe aqueous layer was extracted with ethyl acetate (2×150 mL)
3. dry with materialThe organic layer was dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo