Acetic Anhydride → (4-(((4R)-2,2-dimethyl-1,3-dioxolan-4-yl)methoxy)-3-methylpyridin-2-yl)methanol

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Reaction Conditions

Reaction Steps

The 4-(((4R)-2,2-dimethyl-1,3-dioxolan-4-yl)methoxy)-2,3-dimethylpyridine1-oxide (10.5 g, 41.5 mmol) obtained in the step (14a) was mixed with acetic anhydride (20 ml). The mixture was stirred at 80° C. for one hour. After cooled to room temperature, the reaction mixture was concentrated under reduced pressure. To the residue, methanol (40 ml) and a 5N aqueous sodium hydroxide solution (20 ml) were added and the mixture was stirred at room temperature for 1.5 hours. The reaction mixture was concentrated and the residue was partitioned between a saturated saline solution and ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, filtered and concentrated and the residue was purified by silica gel column chromatography (elution solvent: ethyl acetate/methanol) to obtain the title compound (3.77 g, yield: 41.9%) as a yellow oil.

Provenance & Evidence