反应详情

A mixture of 1.26 parts of 2-chloropyrimidine, 3.6 parts of 4-[[3-(2-ethoxyethyl) -3H-imidazo[4,5-b]pyridin-2-yl]methyl]-1-piperazineethanamine, 1.1 parts of sodium hydrogen carbonate and 64 parts of ethanol was stirred overnight at reflux temperature. The reaction mixture was evaporated and the residue was taken up in water. The product was extracted with dichloromethane. The extract was dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of dichloromethane and methanol (93:7 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was converted into the ethanedioate salt in 2-propanol. The product was filtered off and dried, yielding 3.8 parts (64.3%) of N-[2-[-4-[[3-(2-ethoxyethyl)-3H-imidazo[4,5-b]pyridin-2-yl]methyl]-1-piperazinyl]ethyl]-2-pyrimidinamine ethanedioate(1:2); mp. 175.3° C. (compound 105).

1. temperatureat reflux temperature
2. customThe reaction mixture was evaporated
3. extractionThe product was extracted with dichloromethane
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 dichloromethane and methanol (93:7 by volume) as eluent
9. customThe pure fractions were collected
10. customthe eluent was evaporated
11. filtrationThe product was filtered off
12. customdried