反应详情

To a stirred solution of H2SO4 (1.62 g, 16.56 mmol) in EtOH (200 mL), 4-phenyl-4-piperidinecarboxylic acid 4-methylbenzenesulfonate (25 g, 66.23 mmol) was added and the mixture was stirred and refluxed for 12 h. Excess ethanol was evaporated at reduced pressure and the residue was poured into a mixture of ice and 6N NaOH. The pH was adjusted to 10-11 by adding more 6N NaOH and extracted with CH2Cl2 (3×100 mL). The combined CH2Cl2 extracts were dried (MgSO4) and the solvent evaporated to leave the desired product as a colorless viscous oil, the 1H-NMR showed it to be pure (14.68 g, 95%) and was used without any further purification.

1. temperaturerefluxed for 12 h
2. customExcess ethanol was evaporated at reduced pressure
3. additionthe residue was poured into a mixture of ice and 6N NaOH
4. additionby adding more 6N NaOH
5. extractionextracted with CH2Cl2 (3×100 mL)
6. dry with materialThe combined CH2Cl2 extracts were dried (MgSO4)
7. customthe solvent evaporated