反应详情

A mixture of 47.5 parts of N2 -(2-furanylmethyl)-2,3-pyridinediamine, 36.5 parts of methyl (iminomethoxymethyl)carbamate, 34.5 parts of acetic acid and 450 parts of methylbenzene was stirred and heated for 16 hours at 65°~68° C. The reaction mixture was evaporated. 140 Parts of potassium hydroxide, 50 parts of water and 400 parts of 2-propanol were added to the residue and stirring was continued for 16 hours at reflux. The reaction mixture was concentrated to 1/4 of its volume. 500 Parts of water were added and 2-propanol was distilled off azeotropically. After stirring for 1 hour at room temperature, the product was filtered off, washed successively twice with 20 parts of water and three times with 12 parts of 2-propanone and crystallized from 1,2-dichloroethane. The product was filtered off and dried in vacuo at 50° C., yielding 27.3 parts (51.0%) of 3-(2-furanylmethyl)-3H-imidazo[4,5 -b]pyridin-2-amine; mp. 193.3° C. (interm. 32).

1. temperatureheated for 16 hours at 65°~68° C
2. customThe reaction mixture was evaporated
3. addition140 Parts of potassium hydroxide, 50 parts of water and 400 parts of 2-propanol were added to the residue
4. stirringstirring
5. temperatureat reflux
6. concentrationThe reaction mixture was concentrated to 1/4 of its volume
7. addition500 Parts of water were added
8. distillation2-propanol was distilled off azeotropically
9. stirringAfter stirring for 1 hour at room temperature
10. filtrationthe product was filtered off
11. washwashed successively twice with 20 parts of water and three times with 12 parts of 2-propanone
12. customcrystallized from 1,2-dichloroethane
13. filtrationThe product was filtered off
14. customdried in vacuo at 50° C.