反应详情

A mixture of 60 parts of 7-[5,5-bis(4-fluorophenyl)-4-pentenyl]hexahydro-3,3-dimethylimidazo[1,5-a]pyrazin-1(5H)-one and 850 parts of a hydrochloric acid solution 0.5N was stirred for 2 hours at reflux temperature. After cooling, the reaction mixture was treated with potassium carbonate. The product was extracted with trichloromethane. The extract was dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (95:5 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was crystallized from 1,1'-oxybisethane. The product was filtered off and dried, yielding 29.5 parts (50%) of 4-[5,5-bis(4-fluorophenyl)-4-pentenyl]-2-piperazinecarboxamide monohydrate; mp. 51.3° C. (int. 25).

1. temperatureat reflux temperature
2. temperatureAfter cooling
3. extractionThe product was extracted with trichloromethane
4. customThe extract was dried
5. filtrationfiltered
6. customevaporated
7. customThe residue was purified by column chromatography over silica gel using
8. additiona mixture of trichloromethane and methanol (95:5 by volume) as eluent
9. customThe pure fractions were collected
10. customthe eluent was evaporated
11. customThe residue was crystallized from 1,1'-oxybisethane
12. filtrationThe product was filtered off
13. customdried