[C:1]([O:4][CH2:5][C@H:6]([N:8]1[CH:17]=[CH:16][C:15]2[C:10](=[CH:11][CH:12]=[C:13]([CH3:21])[C:14]=2[N+:18]([O-])=O)[C:9]1=[O:22])[CH3:7])(=[O:3])[CH3:2].C(O)C.[Cl-].[NH4+].O>[Fe]>[C:1]([O:4][CH2:5][C@H:6]([N:8]1[CH:17]=[CH:16][C:15]2[C:10](=[CH:11][CH:12]=[C:13]([CH3:21])[C:14]=2[NH2:18])[C:9]1=[O:22])[CH3:7])(=[O:3])[CH3:2]A round bottom flask was charged with (R)-2-(6-methyl-5-nitro-1-oxoisoquinolin-2(1H)-yl)propyl acetate (3.4 g, 0.010 mol), ethanol (60 mL, 1 mol), and the solution was heated at 85° C. Ammonium chloride (6 g, 0.1 mol) in water (15 mL, 0.83 mol) was added followed by iron (2 g, 0.04 mol) in two portions. The reaction was stirred for 1 hour and poured onto dichloromethane (200 mL) and extracted. the solvent was removed under reduced pressureunder reduced pressure and the residue was purified by flash chromatography to afford the desired product as a light yellow oil.
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