反应详情

A mixture of 17.7 parts of N-(4-chlorobutyl)-4-fluoro-N-(4-fluorophenyl)benzenamine. 23.3 parts of 2-piperazinecarboxamide, 17.6 parts of N,N-diethylethanamine and 300 parts of 2-methoxyethanol was stirred for 48 hours at 70° C. The reaction mixture was evaporated and the residue was taken up in water and a small amount of methanol. The product was extracted twice with dichloromethane. The combined extracts were washed with water, dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol, saturated with ammonia, (95:5 by volume) as eluent. The pure fraction was collected and the eluent was evaporated. The residue was crystallized from a mixture of 2,2'-oxybispropane and acetonitrile (80:20 by volume). The product was filtered off and dried, yielding 12.82 parts (55.0%) of 4-[4-[bis-(4-fluorophenyl)amino]butyl]-2-piperazinecarboxamide; mp. 67.4° C. (int. 28).

1. customThe reaction mixture was evaporated
2. extractionThe product was extracted twice with dichloromethane
3. washThe combined extracts were washed with water
4. customdried
5. filtrationfiltered
6. customevaporated
7. customThe residue was purified by column chromatography over silica gel using
8. additiona mixture of trichloromethane and methanol
9. customThe pure fraction was collected
10. customthe eluent was evaporated
11. customThe residue was crystallized from a mixture of 2,2'-oxybispropane and acetonitrile (80:20 by volume)
12. filtrationThe product was filtered off
13. customdried