[CH3:1][N:2]1[C:10]2[CH2:9][CH:8]([C:11]3[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=3)[CH2:7][C:6](=O)[C:5]=2[CH:4]=[CH:3]1.[C:18]([NH:21][NH2:22])([NH2:20])=[NH:19].[ClH:23].Cl.O>C(O)C>[ClH:23].[NH:21]([N:22]=[C:6]1[CH2:7][CH:8]([C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)[CH2:9][C:10]2[N:2]([CH3:1])[CH:3]=[CH:4][C:5]1=2)[C:18]([NH2:20])=[NH:19]A mixture of 1-methyl-6-phenyl-4,5,6,7-tetrahydroindol-4-one (0.50 g), aminoguanidine hydrochloride (0.26 g), concentrated hydrochloric acid (0.11 ml), water (0.11 ml) and ethanol (50 ml) was refluxed for 30 minutes. Under reduced pressure, the solvent was evaporated, and the residue was dissolved in water. The solution was washed with diethylether, and to the mixture was added 1N sodium hydroxide solution. The mixture was extracted with ethyl acetate, and the organic layer was dried with magnesium sulfate. Under reduced pressure, the solvent was evaporated, and the residue was dissolved in ethanol. To the solution was added 1N hydrochloric acid, and the solvent was evaporated. The residue was recrystallized from ethanol to give 4-guanidinoimino-1-methyl-6-phenyl-4,5,6,7-tetrahydroindole hydrochloride (Compound 7) (0.37 g) as colorless crystals.
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