A new preparative method of 4-hydroxybenzofuran-2-carboxylic acid derivatives.
1989
4-Oxo-4,5,6,7-tetrahydrobenzofuran-2-carboxylic acid was prepared from 1,3-cyclohexanedione and ethyl bromopyruvate. Dehydrogenation of this acid or its methyl ester gave 4-hydroxybenzofuran-2-carboxylic acid derivatives.
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