O.[NH2:2]N.Cl.[N+:5]([C:8]1[CH:13]=[CH:12][C:11]([C:14](=[NH:16])[NH2:15])=[CH:10][CH:9]=1)([O-:7])=[O:6].[C:17]([NH:20][CH:21]([CH3:29])[C:22](=O)[C:23](OCC)=[O:24])(=[O:19])[CH3:18]>C(O)C>[N+:5]([C:8]1[CH:9]=[CH:10][C:11]([C:14]2[NH:15][C:23](=[O:24])[C:22]([CH:21]([NH:20][C:17](=[O:19])[CH3:18])[CH3:29])=[N:2][N:16]=2)=[CH:12][CH:13]=1)([O-:7])=[O:6]7.30 g (7.09 ml, 145.82 mmol) of hydrazine hydrate are added dropwise to 24.50 g (121.5 mmol) of 4-nitrobenzenecarboximidamide hydrochloride from example 1A are in 250 ml of ethanol. The mixture is stirred for one hour at 20° C. After this time, 34.12 g (182.28 mmol) of ethyl 3-(acetylamino)-2-oxobutanoate from example 4A are added in ethanol, and the reaction mixture is stirred for 4 h at a bath temperature of 70–80° C., subsequently for 12 h at 20° C. The mixture is concentrated and the residue is purified by flash chromatography (eluent: ethyl acetate, subsequently dichloromethane/methanol 30:1).
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