METHOD FOR PRODUCING 6,7-DYHYDROXYCOUMARIN-3-CARBOXYLIC ACID DERIVATIVE, AND ITS INTERMEDIATE

摘要

PROBLEM TO BE SOLVED: To provide an industrially suitable method for producing 6,7- dihydroxycoumarin-3-carboxylic acid derivative from 6,7- methylenedioxycoumarin-3-carboxylic acid derivative in high yield by a simple method.;SOLUTION: The method for producing the 6,7-dyhydroxycoumarin-3-carboxy compound comprises (A) a step for reacting molecular chlorine with the 6,7- methylenedioxycoumarin-3-carboxy compound in the presence of a chlorine compound to provide 6,7-chloromethylenedioxycoumarin-3-carboxy compound, and (B) a step for subjecting the 6,7-chloromethylenedioxycoumarin-3-carboxy compound to hydrolysis and/or alcoholysis reaction to provide the 6,7- dihydroxycoumarin-3-carboxy compound.;COPYRIGHT: (C)2004,JPO