反应详情

To a stirred solution of 4.5 parts of N-(4-amino-2,6dichlorophenyl)-4-[5,5-bis(4-fluorophenyl)pentyl]-2-methyl-1-piperazineacetamide in 60 parts of acetic acid was added dropwise a solution of 1.02 parts of potassium cyanate in 17 parts of water. Upon completion, stirring was continued overnight at room temperature. The reaction mixture was evaporated and the residue was taken up in water. The whole was treated with ammonium hydroxide solution and 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, (96:4 by volume) as eluent. The second fraction was collected and the eluent was evaporated. The residue was suspended in 2,2'-oxybispropane. The product was filtered off and dried, yielding 2.49 parts (51.9%) of N-[4-[(aminocarbonyl)amino]-2,6-dichlorophenyl]-4-[5,5-bis(4-fluorophenyl)pentyl]-2-methyl-1-piperazineacetamide; mp. 119.9° C. (compound 76).

1. customThe reaction mixture was evaporated
2. additionThe whole was treated with ammonium hydroxide solution
3. extractionthe product was extracted twice with dichloromethane
4. washThe combined extracts were washed with water
5. customdried
6. filtrationfiltered
7. customevaporated
8. customThe residue was purified by column chromatography over silica gel using
9. additiona mixture of trichloromethane and methanol
10. customThe second fraction was collected
11. customthe eluent was evaporated
12. filtrationThe product was filtered off
13. customdried