m-Chloroperbenzoic acid → HCID 59792353, compound

Participants

Reaction Steps

To a toluene (20 ml)-methanol (2 ml) solution of the 2-(((4-(5,9-dioxaspiro[3.5]non-7-ylmethoxy)-3,5-dimethylpyridin-2-yl)methyl)thio)-1H-benzimidazole (499 mg, 1.17 mmol) obtained in the step (13d), a toluene (1 ml)-methanol (1 ml) solution of 3-chloroperbenzoic acid (280 mg, 1.05 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 55 minutes. To the reaction mixture, a saturated aqueous solution of sodium hydrogen carbonate was added. The mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated. The residue was purified by silica gel column chromatography (NH silica gel: 20 g, elution solvent: dichloromethane, dichloromethane/methanol=20/1). The fractions containing the title compound were collected with ethyl acetate, and concentrated. To the residue, diethyl ether was added and then the mixture was concentrated to obtain the title compound (445 mg, yield: 86.1%) as a colorless foam.

Provenance & Evidence