反应详情

温度

0 °C

To a mixture of 3-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid (from Alfa Aesar, 3.3 g, 14 mmol) and triethylamine (3.8 mL, 27 mmol) in tetrahydrofuran (40 mL) at 0° C. was added dropwise ethyl chloroformate (1.9 mL, 20 mmol). The mixture was stirred at 0° C. for 10 min and then at room temperature for 20 min. The mixture was filtered to remove the white solid and then cooled to 0° C. A mixture of sodium tetrahydroborate (1.0 g, 27 mmol) and methanol (1 mL) was added slowly. The mixture was stirred at room temperature for 1 h. The mixture was quenched with 1N aq. HCl solution and extracted with EtOAc. The extracts were concentrated and purified on silica gel column (eluting with 75% EtOAc in hexanes) to give the desired product (2.88 g, 92%). LCMS calculated for C13H23NO3Na (M+Na)+: m/z=252.2. Found: 252.1.

1. waitat room temperature for 20 min
2. filtrationThe mixture was filtered
3. customto remove the white solid
4. temperaturecooled to 0° C
5. additionwas added slowly
6. stirringThe mixture was stirred at room temperature for 1 h
7. customThe mixture was quenched with 1N aq. HCl solution
8. extractionextracted with EtOAc
9. concentrationThe extracts were concentrated
10. custompurified on silica gel column (eluting with 75% EtOAc in hexanes)