[CH3:1][S:2]([C:5]1[CH:10]=[CH:9][C:8]([CH:11]=[CH2:12])=[C:7]([N+:13]([O-])=O)[CH:6]=1)(=[O:4])=[O:3].CCOC(C)=O>CC(O)=O.[Fe]>[CH2:11]([C:8]1[CH:9]=[CH:10][C:5]([S:2]([CH3:1])(=[O:3])=[O:4])=[CH:6][C:7]=1[NH2:13])[CH3:12]A solution of 4-(methylsulfonyl)-2-nitro-1-vinylbenzene (Intermediate 121; 3.60 g; 15.8 mmol) in AcOH (100 mL) was treated with a solution of iron (15.9 g; 285 mmol) in AcOH (20 ml) and the reaction mixture was stirred at 60° C. for 1 h. EtOAc was added and the solution was filtered, the solvents removed under reduced pressure. The residue was taken up in EtOAc, washed with a sat. NaHCO3 solution in water, then with brine. The organic layer was dried, filtered and concentrated to give the title compound.
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