反应详情

To a cold (0° C.) solution of N-benzyl-4-(4-chlorophenyl)-4-methylpiperidine (3) (0.41 g, 1.4 mmol) in CH2Cl2 was 1.1 equivalent of 1-chloroethylchloroformate. The reaction was then heated to reflux for 2 hrs. Excess solvent was removed and the residue was brought up into methanol. The mixture was refluxed for 2 hrs and excess methanol was removed under reduced pressure. Precipitation of the hydrochloride salt 4 by the addition of CH2Cl2 followed by filtration resulted in the quantitative isolation of the desired crystalline product 4 (100%, 0.34 g). MS m/z: (M+210)

1. temperatureThe reaction was then heated
2. temperatureto reflux for 2 hrs
3. customExcess solvent was removed
4. temperatureThe mixture was refluxed for 2 hrs
5. customexcess methanol was removed under reduced pressure
6. customPrecipitation of the hydrochloride salt 4
7. additionby the addition of CH2Cl2
8. filtrationfollowed by filtration