反应详情

To a solution of tert-butyl trans-4-aminocyclohexylcarbamate (750 mg, 3.50 mmol), paraformaldehyde (318 mg, 10.5 mmol), and sodium cyanoborohydride (660 mg, 13.5 mmol) in methanol (30 mL) was added acetic acid (catalytic) and the reaction stirred at room temperature for 18 h. The reaction mixture was quenched with water and the layers were separated. The pH of the aqueous layer was adjusted to 10 using 1 M sodium hydroxide followed by extraction with methylene chloride. The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated to afford the desired product (805 mg, 95%) as a white solid: ESI MS m/z 243 [C13H26N2O2+H]+.

1. customThe reaction mixture was quenched with water
2. customthe layers were separated
3. extractionfollowed by extraction with methylene chloride
4. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated