反应详情

A mixture of 2.64 parts of 4-[(1H-imidazol-1-yl)phenylmethyl]-1,2-benzenediamine, 50 parts of trimethoxymethane and 1.2 parts of acetic acid was stirred and refluxed for 8 hours. The reaction mixture was evaporated in vacuo. The residue was dissolved in dilute hydrochloric acid. The solution was treated with ammonia and 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 trichloromethane, methanol and methanol, saturated with ammonia, (90:5:5 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The solid residue was washed with 2-propanone, yielding 1.8 parts (65%) of 5-[(1H-imidazol-1-yl)phenylmethyl]-1H-benzimidazole; mp. 186.2° C. (compound 111).

1. temperaturerefluxed for 8 hours
2. customThe reaction mixture was evaporated in vacuo
3. dissolutionThe residue was dissolved in dilute hydrochloric acid
4. additionThe solution was treated with ammonia
5. extractionthe product was extracted with dichloromethane
6. customThe extract was dried
7. filtrationfiltered
8. customevaporated
9. customThe residue was purified by column chromatography over silica gel using
10. additiona mixture of trichloromethane, methanol and methanol
11. customThe pure fractions were collected
12. customthe eluent was evaporated
13. washThe solid residue was washed with 2-propanone