[N:1]([C:4]1[C:12]([N+:13]([O-])=O)=[CH:11][CH:10]=[C:9]2[C:5]=1/[C:6](=[CH:17]/[C:18]1[NH:19][CH:20]=[CH:21][C:22]=1[O:23][CH3:24])/[C:7](=[O:16])[NH:8]2)=[N+]=[N-].[OH-].[NH4+].[H][H]>C1COCC1.[Pt]>[NH2:1][C:4]1[C:12]([NH2:13])=[CH:11][CH:10]=[C:9]2[C:5]=1/[C:6](=[CH:17]/[C:18]1[NH:19][CH:20]=[CH:21][C:22]=1[O:23][CH3:24])/[C:7](=[O:16])[NH:8]2
(Z)-4-Azido-1,3-dihydro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-5-nitro-2H-indol-2-one (2.08 g, 6.37 mmol) (from Example 14) was dissolved in THF (160 mL) at r.t. Ammonium hydroxide was added (2 mL), followed by a catalytic amount of poisoned platinum on carbon (300 mg). The reaction mixture was hydrogenated in a Parr bomb under 50 psi of hydrogen for 12 h. The mixture was filtered through a cake of Celite®, the cake was washed twice with THF, and the filtrate was concentrated under reduced pressure. The crude material was purified by flash chromatography on Silica Gel (230-400 mesh, eluted with 75% ethyl acetate in hexanes) to yield (Z)-4,5-diamino-1,3-dihydro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one. (Yield 1.44 g, 84%).
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