反应详情

To a suspension of tert-butyl [trans-4-(2-aminoethyl)cyclohexyl]carbamate (970 mg, 4.0 mmol) and paraformaldehyde (360 mg, 12 mmol) in methanol (40 mL) was added sodium cyanoborohydride (750 mg, 12 mmol) and acetic acid (1 drop). The resultant suspension was stirred at room temperature for 16 h, diluted with a saturated NaHCO3 solution and extracted with a mixture of CHCl3/isopropanol (3:1). The combined organic layers were dried over anhydrous sodium sulfate, filtered and the filtrate was concentrated. The residue was purified by chromatography (silica, methanol/dichloromethane) to afford the desired product (340 mg, 31%) as a white solid. ESI MS m/z 271 [C15H30N2O2+H]+

1. extractionextracted with a mixture of CHCl3/isopropanol (3:1)
2. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
3. filtrationfiltered
4. concentrationthe filtrate was concentrated
5. customThe residue was purified by chromatography (silica, methanol/dichloromethane)