Iodine → 2-(2-Heptafluoropropylbenzoxazol-5-yl)propionic acid

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Reaction Steps

A mixture of methyl 2-(2-heptafluoropropylbenzoxazol-5-yl)propionate (11.6 g, 0.0311 mol), hexamethyldisilane (6.81 g, 0.047 mol) and iodine (11.85 g, 0.047 mol) was stirred in refluxing toluene (110 ml) for 6 hours. The mixture was cooled to room temperature, diluted with ethyl acetate and washed sequentially with water, saturated aqueous sodium thiosulfate solution and brine. The organic phase was dried over anhydrous magnesium sulfate, filtered and the filtrate was evaporated in vacuo. The residue was purified by column chromatography on silica gel, eluting initially with dichloromethane and then with ethyl acetate:dichloromethane 1:4, to give 2-(2-heptafluoropropylbenzoxazol-5-yl)propionic acid (6.3 g).

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