Methyl iodide → Methyl 3-methoxythiophene-2-carboxylate

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To a mixture of 3-hydroxy-thiophene-2-carboxylic acid methyl ester (5 g, 31.6 mmol) and K2CO3 (22.2 g, 161 mmol) in acetone (50 mL) is added CH3I (10.8 mL, 173 mmol,) dropwise at 0° C. The reaction mixture is heated at 55° C. for 4 hours, cooled to room temperature, filtered through diatomaceous earth, and the filtrate is concentrated under vacuum. The residue is diluted with water (100 mL) and extracted with ethyl acetate (2×200 mL). The combined organic layer is washed with brine solution (50 mL), dried over Na2SO4, and evaporated under vacuum to give title compound as a brown solid (5.9 g). ESI/MS m/z 173.1 (M+H)+.

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