反应详情

2.8 Parts of N,N-diethylethanamine were added to a solution of 1 part of 5H, 10H-diimidazo[1,5-a:1',5'-d]pyrazine-5,10-dione in 36 parts of N,N-dimethylformamide. The thus obtained suspension was added dropwise to a stirred and heated (70° C.) solution of 3.95 parts of trans-4-amino-3-hydroxy-N,N,γ-trimethyl-α,α-diphenyl-1-piperidinebutanamide in 18 parts of N,N-dimethylformamide. Upon complete addition, stirring was continued overnight at 70° C. After evaporation, the residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol, saturated with ammonia, (90:10 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was further purified by column chromatography (HPLC) over silica gel using a mixture of trichloromethane, methanol and methanol, saturated with ammonia, (90:9:1 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was pulverised and evaporated again, yielding 1.13 parts (23%) of trans-3-hydroxy-4-[(1H-imidazol-5-yl)carbonylamino] -N,N,γ-trimethyl-α,α-diphenyl-1-piperidinebutanamide; mp. 155.0° C. (compound 43).

1. additionThe thus obtained suspension was added dropwise to
2. additionUpon complete addition
3. stirringstirring
4. customAfter evaporation
5. customthe residue was purified by column chromatography over silica gel using
6. additiona mixture of trichloromethane and methanol
7. customThe pure fractions were collected
8. customthe eluent was evaporated
9. customThe residue was further purified by column chromatography (HPLC) over silica gel using
10. additiona mixture of trichloromethane, methanol and methanol
11. customThe pure fractions were collected
12. customthe eluent was evaporated
13. customevaporated again