Cl[CH2:2][CH2:3][CH2:4][O:5][C:6]1[CH:7]=[C:8]2[C:13](=[CH:14][CH:15]=1)[NH:12][C:11](=[O:16])[CH:10]=[CH:9]2.[CH3:17][NH2:18]>CO>[CH3:17][NH:18][CH2:2][CH2:3][CH2:4][O:5][C:6]1[CH:7]=[C:8]2[C:13](=[CH:14][CH:15]=1)[NH:12][C:11](=[O:16])[CH:10]=[CH:9]26-(3-Chloropropoxy)carbostyril (20 g) is added into a 40% solution of methylamine in methanol (200 ml), and the mixture is heated with stirring at 100° C. overnight in a sealed tube. The mixture is concentrated under reduced pressure to remove the solvent, and the precipitated crystals are washed with a mixture of chloroform-diethyl ether, purified by silica gel column chromatography (solvent; methylene chloride:methanol:aqueous ammonia=50:10:1), and recrystallized from chloroform-diethyl ether to give 6-(3-methylaminopropoxy)carbostyril (15.4 g).
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