Potassium hydroxy sulfite → 4-Fluoro-3-(methoxycarbonyl)benzoic acid
反応式
[CH3:1][O:2][C:3](=[O:13])[C:4]1[CH:9]=[C:8]([CH:10]=[O:11])[CH:7]=[CH:6][C:5]=1[F:12].[OH:14]OS([O-])=O.[K+]>CN(C=O)C>[F:12][C:5]1[CH:6]=[CH:7][C:8]([C:10]([OH:14])=[O:11])=[CH:9][C:4]=1[C:3]([O:2][CH3:1])=[O:13]参加物
4
実験手順
To a solution of methyl-2-fluoro-5-formylbenzoate (2 g, 0.0109 mol) in dry DMF (75 mL) was added oxone (Aldrich, 6.75 g, 0.0109 mol) and the reaction mixture was stirred for 3 h at room temperature. The reaction mixture was then quenched with 1.5M.HCl (50 mL) and the product was extracted with ethyl acetate (2×50 mL). The combined organic layers were washed with water, brine, dried over magnesium sulfate filtrated and concentrated to give 1.7 g (78%) of the titled compound as a solid. TLC: Chloroform/methanol (9/1), Rf=0.2, HPLC purity >99%. 1H NMR (DMSO) δ: 8.44 (m, 1H), 8.19 (m, 1H), 7.48 (m 1H), 3.88 (s, 1H).