[N:1]1[C:9]2[CH:8]=[CH:7][N:6]=[CH:5][C:4]=2[NH:3][C:2]=1[C:10]1[C:18]2[N:17]3[CH:19]=[CH:20][CH:21]=[C:16]3[C:15](=[N:22]O)[C:14]=2[CH:13]=[CH:12][CH:11]=1.C(O)C.O>C(O)(=O)C.[Zn]>[N:1]1[C:9]2[CH:8]=[CH:7][N:6]=[CH:5][C:4]=2[NH:3][C:2]=1[C:10]1[C:18]2[N:17]3[CH:19]=[CH:20][CH:21]=[C:16]3[CH:15]([NH2:22])[C:14]=2[CH:13]=[CH:12][CH:11]=1In a 100 ml round-bottomed flask, a mixture of 200 mg of 5-(3H-imidazo[4,5-c]pyridin-2-yl)pyrrolo[1,2-a]indol-9-one oxime obtained according to the preceding stage, in 5 ml of glacial acetic acid, 5 ml of ethanol and 5 ml of water, is stirred at ambient temperature. 43 mg of powdered zinc are added and the stirring is maintained at ambient temperature for 2 hours. The reaction medium is filtered through clarcel, washing being carried out with methanol. The filtrate is evaporated to dryness under vacuum and the residue is chromatographed on silica gel (15-40 μm), elution being carried out with a mixture of dichloromethane and 5N ammoniacal methanol (95/5 v/v). 51 mg of 5-(3H-imidazo[4,5-c]pyridin-2-yl)-9H-pyrrolo[1,2-a]indol-9-ylamine are obtained in the form of a solid, the characteristics of which are the following:
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