[CH3:1][N:2]([CH3:19])[C:3]([C@H:5]1[CH2:9][CH2:8][CH2:7][N:6]1[C:10]1[CH:15]=[CH:14][C:13]([N+:16]([O-])=O)=[CH:12][CH:11]=1)=[O:4].C([O-])=O.[NH4+]>CO.[Pd]>[CH3:1][N:2]([CH3:19])[C:3]([C@@H:5]1[CH2:9][CH2:8][CH2:7][N:6]1[C:10]1[CH:11]=[CH:12][C:13]([NH2:16])=[CH:14][CH:15]=1)=[O:4](R)-1-(4-Nitro-phenyl)-pyrrolidine-2-carboxylic acid dimethylamide (Method 52; 0.85 g) was dissolved in MeOH (50 ml), to this was added ammonium formate (1.0 g, 16 mmol) and palladium (0.1 g). The reaction was heated at reflux for 60 minutes (reaction decolourised). MeOH was removed in vacuo and saturated ammonium chloride (50 ml) was added. The system was extracted with DCM (2×100 ml), dried and solvent was removed in vacuo to yield the title compound as a brown gum (0.67 g, 87%). The product rapidly turned black on exposure to air. The product was used immediately without any purification.
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