[N+:1]([C:4]1[CH:13]=[C:12]2[C:7]([C:8]([Br:18])=[N:9][N:10]([CH:15]([CH3:17])[CH3:16])[C:11]2=[O:14])=[CH:6][CH:5]=1)([O-])=O.Cl>C(O)C.O.[Fe]>[NH2:1][C:4]1[CH:13]=[C:12]2[C:7]([C:8]([Br:18])=[N:9][N:10]([CH:15]([CH3:16])[CH3:17])[C:11]2=[O:14])=[CH:6][CH:5]=17-Nitro-2-Isopropyl-4-bromo-2H-phthalazin-1-one (4.6 g, 0.015 mol) was dissolved in a 5:1 mixture of ethanol and water (150 ml). To this solution was added iron powder (2.14 g, 0.039 mol) and concentrated hydrochloric acid (1 ml), the mixture was heated to 80° C. for three hours. After this time, the reaction mixture was cooled to room temperature and filtered through a pad of celite, the celite was washed with ethanol (100 ml), and the solution was concentrated under vacuum to give the title compound (4.2 g, 98% yield) as a white solid.
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