Pyridine → 2-(3-Chloromethyl-benzoylamino)-5-dipropylamino-benzoic acid methyl ester

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2-Amino-5-dipropylamino-benzoic acid methyl ester (compound A) (243 mg) produced by the above reaction was dissolved in anhydrous methylene chloride (3.0 ml). Subsequently, pyridine (170 μl) and 3-(chloromethyl)benzoyl chloride (compound B) (166 μl) were added to the solution at 0° C., and the mixture was stirred at 0° C. for one hr. After the completion of the reaction, distilled water was added thereto, and the mixture was subjected to separatory extraction with chloroform. The organic layer was washed with saturated brine, was dried over sodium sulfate, and was then concentrated. The residue was purified by column chromatography using a hexane-acetone system to give 2-(3-chloromethyl-benzoylamino)-5-dipropylamino-benzoic acid methyl ester as a useful intermediate (280 mg, yield 64%).

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