反应详情

温度

30 °C

To a stirred solution of 35 parts of ethyl 3-hydroxy-4,4-dimethoxy-1-piperidinecarboxylate in 144 parts of N,N-dimethylformamide were added portionwise 8.2 parts of a sodium hydride dispersion 50% at about 30° C. After stirring for 1.50 hours at about 30° C., the mixture was cooled to room temperature and 26.5 parts of iodoethane were added dropwise at a temperature below 30° C. Upon completion, stirring was continued for 18 hours at room temperature. The reaction mixture was poured onto water and the product was extracted with 4-methyl-2-pentanone. The extract was washed with water, dried, filtered and evaporated, yielding 34.1 parts (87%) of ethyl 3-ethoxy-4,4-dimethoxy-1-piperidinecarboxylate as a residue (intermediate 67).

1. temperaturethe mixture was cooled to room temperature
2. stirringUpon completion, stirring
3. waitwas continued for 18 hours at room temperature
4. additionThe reaction mixture was poured onto water
5. extractionthe product was extracted with 4-methyl-2-pentanone
6. washThe extract was washed with water
7. customdried
8. filtrationfiltered
9. customevaporated