3,4-Dimethylpyridine → 3,4-Dimethylpyridine 1-oxide

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Reaction Steps

To a solution of 3,4-dimethylpyridine (100.0 g, 0.93 mol) in dichloromethane was added m-CPBA (320.0 g, 1.87 mol) at the room temperature. The reaction mixture was stirred at room temperature overnight, and then quenched with saturated solution of Na2S2O3 (100 mL). The organic layer was separated and the aqueous phase was extracted with CH2Cl2 (300 mL×3). The combined organic layers were dried over anhydrous Na2SO4, filtered and evaporated under vacuum to yield a residue that was purified by column chromatography on silica gel (10-100% MeOH in EtOAc) to give 3,4-dimethylpyridine 1-oxide (70.0 g, 61%).

Provenance & Evidence