反应详情

2-[4-Phenyl-1-(3-phenyl-propyl)-butylcarbamoyl]-piperidine-1-carboxylic acid tert-butyl ester (73) (6.77 g; 14.1 mmol) is dissolved in methylene chloride (60 mL) at ambient temperature. Trifluoroacetic acid (40 mL) is added in a slow stream, and the solution is stirred for 1.25 hours at ambient temperature. The solution is concentrated in vacuo at 40° C. The residue is dissolved in methylene chloride (300 mL) and poured onto saturated sodium bicarbonate solution. The pH is adjusted to 9 with saturated potassium carbonate solution. The mixture is shaken the layers separated. The water layer is extracted with methylene chloride (3×100 mL). The combined organic extracts are washed with water, dried over MgSO4, filtered, and concentrated in vacuo affording the desired product (5.34 g) as a white solid. ESMS:MH+ 379.2

1. concentrationThe solution is concentrated in vacuo at 40° C
2. dissolutionThe residue is dissolved in methylene chloride (300 mL)
3. additionpoured onto saturated sodium bicarbonate solution
4. stirringThe mixture is shaken the layers
5. customseparated
6. extractionThe water layer is extracted with methylene chloride (3×100 mL)
7. washThe combined organic extracts are washed with water
8. dry with materialdried over MgSO4
9. filtrationfiltered
10. concentrationconcentrated in vacuo