反应详情

Methyl 2-[4-{2-(4-chlorophenyl)-5-nitrobenzyloxy}-2-fluorophenyl]-1-cyclohexylbenzimidazole-5-carboxylate (1.9 g) obtained in Example 337 was suspended in ethanol (40 ml), and tin(II) chloride dihydrate (3.5 g) was added, which was followed by refluxing under heating for 30 min. The reaction mixture was concentrated under reduced pressure, 4N sodium hydroxide was added and the mixture was extracted with chloroform. The organic layer was washed with 2N sodium hydroxide and water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. Diisopropyl ether was added to the residue, and the precipitated crystals were collected by filtration to give the title compound (1.5 g, yield 82%).

1. temperatureby refluxing
2. temperatureunder heating for 30 min
3. concentrationThe reaction mixture was concentrated under reduced pressure, 4N sodium hydroxide
4. additionwas added
5. extractionthe mixture was extracted with chloroform
6. washThe organic layer was washed with 2N sodium hydroxide and water
7. dry with materialdried over anhydrous magnesium sulfate
8. concentrationconcentrated under reduced pressure
9. additionDiisopropyl ether was added to the residue
10. filtrationthe precipitated crystals were collected by filtration