反应详情

To a toluene (45 ml)-methanol (5 ml) solution of the 2-(((4-((2,2-dimethyl-1,3-dioxan-5-yl)methoxy)-3-methylpyridin-2-yl)methyl)thio)-1H-benzimidazole (766 mg, 1.92 mmol) obtained in the step (12c), a toluene (0.5 ml)-methanol (0.5 ml) solution of 3-chloroperbenzoic acid (459 mg, 1.73 mmol as the content was regarded as 65%) was added dropwise at −65° C. for 5 minutes in a nitrogen atmosphere. The mixture was stirred in the same conditions for one hour and 20 minutes. To the reaction mixture, a saturated aqueous solution of sodium hydrogen carbonate was added. The aqueous layer was extracted with ethyl acetate and chloroform (three times). Organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated. The residue was purified by silica gel column chromatography (NH silica gel: 30 g, elution solvent: dichloromethane, dichloromethane/methanol=20/1). The fractions containing the title compound were collected, concentrated to obtain the title compound (688 mg, yield: 86.2%) as a light brown foam.

1. additionwas added dropwise at −65° C. for 5 minutes in a nitrogen atmosphere
2. extractionThe aqueous layer was extracted with ethyl acetate and chloroform (three times)
3. dry with materialdried over anhydrous sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customThe residue was purified by silica gel column chromatography (NH silica gel: 30 g, elution solvent: dichloromethane, dichloromethane/methanol=20/1)
7. additionThe fractions containing the title compound
8. customwere collected
9. concentrationconcentrated