反应详情

To a 250 ml round bottom flask was added tert-butyl 4-(1-methyl-1-{[3-(trifluoromethyl)phenyl]sulfonyl}ethyl)piperidine-1-carboxylate from the previous step, 60 ml ethyl acetate and 60 ml 3N HCl. The reaction mixture was heated at reflux for 3 hours. NMR showed complete conversion. The volatiles were removed and the residue was dissolved in 50 ml water, washed with 50 ml ether. The aqueous portion was basified with addition of KOH and extracted twice with 60 ml ethyl acetate. The extracts were dried over sodium sulfate, filtered and concentrated to give 3.5 g colorless solid.

1. temperatureThe reaction mixture was heated
2. temperatureat reflux for 3 hours
3. customThe volatiles were removed
4. dissolutionthe residue was dissolved in 50 ml water
5. washwashed with 50 ml ether
6. additionThe aqueous portion was basified with addition of KOH
7. extractionextracted twice with 60 ml ethyl acetate
8. dry with materialThe extracts were dried over sodium sulfate
9. filtrationfiltered
10. concentrationconcentrated