反应详情

A mixture of 41.8 parts of 4-[[3-(2-ethoxyethyl)-3H-imidazo-[4,5-b]pyridin-2-yl]methyl)-1-piperazineacetonitrile and 1100 parts of methanol, saturated with ammonia was hydrogenated at normal pressure and at room temperature with 20 parts of Raney nickel catalyst. After the calculated amount of hydrogen was taken up, the catalyst was filtered off and the filtrate was evaporated. The residue was converted into the (E)-2-butenedioate salt in 2-propanol. The salt was filtered off and crystallized from a mixture of acetonitrile and 2-propanol. The product was filtered off and dried, yielding 37.4 parts (52.1%) of 4-[[3-(2-ethoxyethyl)-3H-imidazo[4,5-b]pyridin-2-yl]methyl]-1-piperazineethanamine; mp. 159.8° C. (compound 128).

1. filtrationthe catalyst was filtered off
2. customthe filtrate was evaporated
3. filtrationThe salt was filtered off
4. customcrystallized from a mixture of acetonitrile and 2-propanol
5. filtrationThe product was filtered off
6. customdried