反应详情

To a solution of 2-mercapto-5-methoxybenzimidazole (15.1 g, 0.14 mole) dissolved in 40 ml of 8.4% sodium hydroxide, was added 170 ml of methanol, followed by bromo(4-methoxy-3,5-dimethyl-2-pyridyl)acetonitrile(21.4 g, 0.11 mole) at room temperature. The mixture was heated to reflux for 1 h under a nitrogen atmosphere. The resulting precipitate was removed by filtration and the methanol was evaporated. The residue obtained was extracted with chloroform, and the chloroform was washed 3 times with water and dried over magnesium sulfate. After evaporation of the solvent, the crude product was recrystallized from diethyl ether to give 22.6 g (90%) of the title compound as yellowish crystals: mp 193°-197° C.; 1H NMR (CDCl3) δ8.25 (s,1H), 7.65 (dd, 1H), 7.30 (m, 1H), 6.90 (m, 1H), 6.30 (br s, 2H), 3.95 (s, 3H), 3.75 (s, 3H), 2.50 (s, 3H), 2.20 (s, 3H) ppm.

1. temperatureThe mixture was heated
2. temperatureto reflux for 1 h under a nitrogen atmosphere
3. customThe resulting precipitate was removed by filtration
4. customthe methanol was evaporated
5. customThe residue obtained
6. extractionwas extracted with chloroform
7. washthe chloroform was washed 3 times with water
8. dry with materialdried over magnesium sulfate
9. customAfter evaporation of the solvent
10. customthe crude product was recrystallized from diethyl ether