m-Chloroperbenzoic acid → 1H-Isoindole-1,3(2H)-dione, 2-(4,5-dimethyl-1-oxido-2-pyridinyl)-

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Reaction Steps

To a solution of 2-(4,5-dimethylpyridin-2-yl)-isoindoline-1,3-dione (1.7 g, 0.01 mol) in CH2Cl2 (50 mL) was added m-CPBA (3.5 g, 0.02 mol) at the room temperature. The mixture was stirred overnight, then quenched by addition of a saturated solution of Na2S2O3 (100 mL). The organic layer was separated and the aqueous phase was extracted with CH2Cl2 (50 mL×3). The combined organic layers were dried over anhydrous Na2SO4, filtered and evaporated under vacuum to give 2-(1,3-dioxoisoindolin-2-yl)-4,5-dimethylpyridine 1-oxide (1.5 g, 83%), which was used directly in the next step.

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