Diethyl Ether → Methyl 5-methyl-2-thiophenecarboxylate

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Reaction Steps

To a solution of 5-methylthiophene-2-carboxylic acid (40.3 g, 282 mmol) in N,N-dimethylformamide (500 ml) were added potassium carbonate (43 g, 310 mmol) and methyl iodide (19.3 ml, 310 mmol). After stirring at room temperature for 4 hr, diethyl ether (1.0 L) was added, and the organic layer was washed successively with water (500 ml×3) and saturated brine (200 ml) and dried over magnesium sulfate. After filtration and concentration, methyl 5-methylthiophene-2-carboxylate (40.8 g, yield 93%) was obtained.

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