Stannous Chloride → Methyl 3-amino-5-(5-methylpyridin-2-yl)benzoate
反応式
[CH3:1][O:2][C:3](=[O:20])[C:4]1[CH:9]=[C:8]([N+:10]([O-])=O)[CH:7]=[C:6]([C:13]2[CH:18]=[CH:17][C:16]([CH3:19])=[CH:15][N:14]=2)[CH:5]=1.Cl[Sn]Cl>CO.C(OCC)(=O)C>[CH3:1][O:2][C:3](=[O:20])[C:4]1[CH:5]=[C:6]([C:13]2[CH:18]=[CH:17][C:16]([CH3:19])=[CH:15][N:14]=2)[CH:7]=[C:8]([NH2:10])[CH:9]=1参加物
4
実験手順
To a solution of 3-(5-methyl-pyridin-2-yl)-5-nitro-benzoic acid methyl ester (4 g, 14.7 mmol) in methanol/ethyl acetate was added SnCl2 (11.15 g, 58.8 mmol) at room temperature. The reaction mixture was refluxed for 3 hours and then cooled. Solvent was removed under reduced pressure and the residue was dissolved in H2O and basified by addition of Na2CO3 to pH=9. The mixture was extracted with CH2Cl2, and the organic phase was washed with water, brine, and dried over Na2SO4. The solvent was removed under reduced pressure to give 3-amino-5-(5-methyl-pyridin-2-yl)-benzoic acid methyl ester (3.2 g, 90%) as white solid.