反应详情

温度

125 °C

To a 125 mL 3 neck flask with mechanical stirring, condenser, and a heating apparatus consisting of an RTD probe in the flask hooked via a temperature controller to a heating mantle, the following were added: 7.61 g methyl 4-hydroxybenzoate, 11.05 g β-chloroethylpiperidine hydrochloride, 16.59 g powdered potassium carbonate, and 60 mL amyl acetate. The mixture was heated overnight under nitrogen in an oil bath to 125° C., and was allowed to proceed until HPLC indicated complete consumption of the methyl 4-hydroxybenzoate. The mixture was cooled to ambient temperature and 40 mL deionized water was added to dissolve the solids. The aqueous layer was separated and discarded. The water wash was repeated. 25 mL of 8N hydrochloric acid were added to extract intermediate. The layers were separated and the acid layer returned to the reaction flask. The acid solution was heated to 95° C. for about 24 hours as a "stress" test; (after 6 hours 1% of the uncleaved ester remained.) The mixture was cooled to 40° C. and 25 mL acetone added. The mixture was cooled to 0° C.-5° C. for 1 hour. The mixture was filtered and the cakes rinsed with approx. 25 mL acetone and dried. Yield=12.0 g (84.1% of theoretical).

1. additionthe following were added
2. customconsumption of the methyl 4-hydroxybenzoate
3. temperatureThe mixture was cooled to ambient temperature
4. additionwas added
5. dissolutionto dissolve the solids
6. customThe aqueous layer was separated
7. washThe water wash
8. addition25 mL of 8N hydrochloric acid were added
9. extractionto extract intermediate
10. customThe layers were separated
11. temperatureThe acid solution was heated to 95° C. for about 24 hours as a "stress" test
12. temperature(after 6 hours 1% of the uncleaved ester remained.) The mixture was cooled to 40° C.
13. addition25 mL acetone added
14. temperatureThe mixture was cooled to 0° C.-5° C. for 1 hour
15. filtrationThe mixture was filtered
16. washthe cakes rinsed with approx. 25 mL acetone
17. customdried