PROBLEM TO BE SOLVED: To provide mainly a method for producing an etodolac ester which is an intermediate for producing etodolac.
SOLUTION: The method for producing etodolac methyl ester is to react 7-ethyl tryptophol with a 3-oxo-valerate ester in an acetonitrile solvent or a mixed solvent containing ≥50 vol% acetonitrile in the presence of an acid.
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