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温度

0 °C

4-(4Fluoro-phenyl)-piperidine hydrochloride (1.0 g; 4.64 mmol) and Et3N (1.9 ml; 13.9 mmol) was dissolved in DCM (20 ml) and cooled to 0° C. using an ice/water bath. ClSO3H (309 ul; 4.6 mmol) was slowly added droppwise due to highly exothermic reaction. After addition was compleat the mixture was allowed to reach room temperature and stirred over night. The clear yellow solution of the intermediate sulfonicacid derivative was evaporated and dry Toluene (20 ml) was added to form a slurry. To this slurry was added PCl5 (1.06 g; 5.1 mmol) in portions, the mixture was heated on an oil bath to 75° C. for 2 h, and then left over night in room temperature before filtration. The filtercake was washed with Toluene and the filtrate was evaporated. EtOAc was added and precipitating salts was removed by filtration. The crude product was purified on 70 g Si-60 gel using flash chromatography with a gradient 100% Heptane to 100% DCM. Gradient time was 35 min and flow of solvent was 20 ml/min. Fractions containing product was evaporated to give the title compound as a slightly yellow oil that crystallises upon standing. Obtained 0.94 (70% yield) of the title compound.

1. additionAfter addition
2. customto reach room temperature
3. customThe clear yellow solution of the intermediate sulfonicacid derivative was evaporated
4. additiondry Toluene (20 ml) was added
5. customto form a slurry
6. temperaturethe mixture was heated on an oil bath to 75° C. for 2 h
7. waitleft over night in room temperature before filtration
8. washThe filtercake was washed with Toluene
9. customthe filtrate was evaporated
10. additionEtOAc was added
11. customprecipitating salts
12. customwas removed by filtration
13. customThe crude product was purified on 70 g Si-60 gel
14. additionFractions containing product
15. customwas evaporated