O.[OH-].[Li+].O.[CH3:5][O:6][C:7]1[CH:15]=[C:14]2[C:10]([C:11]([C:26]([O:28]C)=[O:27])=[CH:12][N:13]2[C:16]2[C:25]3[C:20](=[CH:21][CH:22]=[CH:23][CH:24]=3)[N:19]=[CH:18][CH:17]=2)=[CH:9][CH:8]=1.Cl>O1CCCC1>[C:26]([C:11]1[C:10]2[C:14](=[CH:15][C:7]([O:6][CH3:5])=[CH:8][CH:9]=2)[N:13]([C:16]2[C:25]3[C:20](=[CH:21][CH:22]=[CH:23][CH:24]=3)[N:19]=[CH:18][CH:17]=2)[CH:12]=1)([OH:28])=[O:27]0.947 g (22.57 mmol) of lithium hydroxide monohydrate and 115 cm3 of water are added at a temperature in the region of 25° C. to 2.5 g (7.52 mmol) of 6-methoxy-3-methoxycarbonyl-1-(quinol-4-yl)-1H-indole dissolved in 115 cm3 of tetrahydrofuran. After stirring at the reflux point of the solvent for 19 hours, the reaction mixture is concentrated under reduced pressure (2.7 kPa) to give a residue which is taken up with 22.5 cm3 of N hydrochloric acid. After filtering off and drying the solid residue at atmospheric pressure at a temperature in the region of 60° C., 2.4 g of 3-carboxy-6-methoxy-1-(quinol-4-yl)-1H-indole are obtained in the form of a beige-coloured solid which decomposes at approximately 175° C.
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