[CH3:1][NH:2][C:3]1[N:8]=[C:7]([C:9]2[NH:10][C:11]3[C:16]([CH:17]=2)=[CH:15][C:14]([C:18]([O:20]CC)=[O:19])=[CH:13][CH:12]=3)[CH:6]=[CH:5][N:4]=1.[OH-].[Na+:24]>C(O)C>[Na+:24].[CH3:1][NH:2][C:3]1[N:8]=[C:7]([C:9]2[NH:10][C:11]3[C:16]([CH:17]=2)=[CH:15][C:14]([C:18]([O-:20])=[O:19])=[CH:13][CH:12]=3)[CH:6]=[CH:5][N:4]=125 g of ethyl 2-(2-methylaminopyrimidin-4-yl)-1H-indole-5-carboxylate were admixed with 200 ml of ethanol and 24.5 g of 33% sodium hydroxide solution, and heated to from 65° C. to 70° C. for 4 h. After cooling, the mixture was filtered with suction and the precipitate was washed with 15 ml of ethanol/water (9:1). 24.5 g (87.6% of theory) of 2-(2-methylaminopyrimidin-4-yl)-1H-indole-5-carboxylic acid sodium salt were obtained (98.1 HPLC area %). LCMS: [M+H]⊕ 269.10
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