Sodium Carbonate → 4-[2-(3-Benzyl-[1,2,4]oxadiazol-5-yl)-vinyl]benzene-1,2-diol

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Reaction Conditions

Reaction Steps

3-Benzyl-5-[2-(3,4-dimethoxy-phenyl)-vinyl-]-[1,2,4]oxadiazole (compound of Example 4, Method A, Step 1; 0.180 g, 0.55 mmol) was dissolved in dichloromethane (7 mL) and cooled to −78° C. A solution of boron tribromide (0.41 mL, 4.40 mmol) in dichloromethane (4 mL), which was cooled to 0° C., was added slowly over a period of 15 min. After 3 h, the reaction mixture was warmed to room temperature and stirred for 3 h. After completion of the reaction, the mixture was quenched by dropwise addition of methanol (15 mL) at 0° C. and stirred for 20 min at room temperature. The solvent was evaporated and the residue obtained was redissolved in 10% methanol in chloroform at 0° C., followed by stirring with solid sodium carbonate to maintain pH ˜8. The solvent was evaporated and the crude product obtained was purified by column chromatography (silica gel, 0.5% methanol in chloroform) to afford the title compound.

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