Water → Methyl 4-[4-[(acetylsulfanyl)methyl]-5-methyl-1,3-oxazol-2-yl]benzoate

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A solution of methyl 4-[4-(chloromethyl)-5-methyl-1,3-oxazol-2-yl]benzoate (5 g, 18.82 mmol, 1.00 equiv), potassium ethanethioate (2.68 g, 23.47 mmol, 1.25 equiv) and potassium iodide (120 mg, 0.72 mmol, 0.04 equiv) in acetone (40 mL) was stirred at 35° C. for 30 min. Water (50 mL) was added to quench the reaction. The resulting solution was extracted with 3×100 mL of ethyl acetate. The combined organic layers was washed with 2×200 mL of brine, dried over anhydrous sodium sulfate and concentrated under vacuum to give 6.03 g of crude methyl 4-[4-[(acetylsulfanyl)methyl]-5-methyl-1,3-oxazol-2-yl]benzoate as a white solid.

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