[CH2:1]([N:8]1[CH2:12][CH:11]([N+:13]([O-])=O)[CH:10]([C:16]2[CH:21]=[CH:20][C:19]([F:22])=[CH:18][C:17]=2[CH3:23])[CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.O.O.Cl[Sn]Cl.C([O-])(O)=O.[Na+]>CCOC(C)=O>[CH2:1]([N:8]1[CH2:9][CH:10]([C:16]2[CH:21]=[CH:20][C:19]([F:22])=[CH:18][C:17]=2[CH3:23])[CH:11]([NH2:13])[CH2:12]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1To a stirred solution of rac-(3R,4S)-1-benzyl-3-(4-fluoro-2-methyl-phenyl)-4-nitro-pyrrolidine (56 mg, 0.18 mmol) in EtOAc (5 ml) was added in one portion SnCl2.2H2O (201 mg, 0.89 mmol). The reaction mixture was then heated at reflux for 2 hours, cooled down to RT and a saturated aqueous solution of NaHCO3 (100 ml) was added. The salts were filtered off and the product extracted with EtOAc. The organic phases were then dried over Na2SO4, and concentration under vacuum gave 40 mg (79%) of rac-(3S,4R)-1-benzyl-4-(4-fluoro-2-methyl-phenyl)-pyrrolidin-3-ylamine as a light yellow oil. The product was then used in the next step without further purification. ES-MS m/e: 285.3 (M+H+).
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