[Br:1][CH2:2][CH2:3][C:4]1[CH:9]=[CH:8][C:7]([NH:10][CH2:11][C:12]([O:14][CH2:15][CH3:16])=[O:13])=[CH:6][CH:5]=1.Cl.[I:18]N1C(=O)CCC1=O.S([O-])([O-])(=O)=S.[Na+].[Na+]>C(#N)C.O.C(O)C>[Br:1][CH2:2][CH2:3][C:4]1[CH:9]=[CH:8][C:7]([NH:10][CH2:11][C:12]([O:14][CH2:15][CH3:16])=[O:13])=[C:6]([I:18])[CH:5]=1To a stirred solution of ethyl N-[4-(2-bromoethyl)-phenyl]aminoacetate (580 mg) in acetonitrile (4.05 ml) were added concentrated hydrochloric acid (169 μl) and N-iodosuccinimide (912 mg) under ice-cooling, and the mixture was stirred for 1 hour. Ethanol (4.0 ml) was added to the reaction mixture, and the mixture was stirred for 45 minutes under ice-cooling. A solution of sodium thiosulfate (640 mg) in water (20 ml) was added to the reaction mixture, and the mixture was stirred for 1 hour under ice-cooling. The reaction mixture was diluted with water and extracted with ethyl acetate. The extract was washed with brine and dried over anhydrous magnesium sulfate, and the solvent was removed in vacuo. Purification of the residue by medium pressure liquid column chromatography on silica gel (eluent: hexane/ethyl acetate=9/1) gave ethyl N-[4-(2-bromoethyl) -2-iodophenyl]aminoacetate (449 mg).
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