5-(1-Hydroxy-ethyl)-2-methyl-furan-3-carboxylic acid methyl ester → Methyl 5-acetyl-2-methylfuran-3-carboxylate

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Reaction Steps

Manganese dioxide (669 g) is added portionwise to a solution of 5-(1-hydroxy-ethyl)-2-methyl-furan-3-carboxylic acid methyl ester (94.5 g) in dichloromethane (1000 ml). After 72 hours at room temperature, the reaction mixture is filtered through a plug of silica gel and the filtration cake is washed several times with ethyl acetate. The filtrate is concentrated in verve to yield 5-acetyl-2-methyl-furan-3-carboxylic acid methyl ester (78 g) as a yellow solid. The crude product obtained is used without further purification. MS (HPLC/MS): 183 (MH+).

Provenance & Evidence