A method for producing a compound represented by formula (2) or a salt thereof, characterized in that a compound represented by formula (1) or a salt thereof is reacted with 2,2-dialkoxypropane or isopropenyl alkyl ether in the presence of (A) an acid selected from the group consisting of p-toluenesulfonic acid, pyridinium-p-toluenesulfonate, hydrobromic acid, and pyridine hydrobromide, and/or (B) a base selected from the group consisting of pyridine and N,N-dimethylaniline, and (C) water.
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