Benzyl Bromide → Methyl 4-(benzyloxy)-3-chlorobenzoate

反応式

[CH3:1][O:2][C:3](=[O:12])[C:4]1[CH:9]=[CH:8][C:7]([OH:10])=[C:6]([Cl:11])[CH:5]=1.[CH2:13](Br)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.C(=O)([O-])[O-].[K+].[K+]>CN(C)C=O>[CH3:1][O:2][C:3](=[O:12])[C:4]1[CH:9]=[CH:8][C:7]([O:10][CH2:13][C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)=[C:6]([Cl:11])[CH:5]=1

参加物

実験手順

A mixture of 3-chloro-4-hydroxy benzoic acid methyl ester (4.665 g, 25 mmol), benzyl bromide (5.13 g, 30 mmol) and potassium carbonate (6.91 g, 50 mmol) in N,N-dimethylformamide (50 mL) was stirred overnight at room temperature. The reaction mixture was poured onto crushed ice (ca. 300 g) and the product was extracted with ethyl acetate (2×100 mL). The combined organic layers were dried over sodium sulphate and concentrated under reduced pressure. The residue was dissolved in dichloromethane and precipitated by addition of hexane. Yield: 6.47 g (94%) white powder. 1H-NMR (400 MHz, CDCl3) δ=3.90 (s, 3H, —OCH3); 5.23 (s, 2H, —CH2Ar), 6.99 (d, J=9.0 Hz, 1H), 7.31-7.48 (m, 5H), 7.89 (dd, J=9.0, 2.3 Hz, 1H), 8.08 (d, J=2.3 Hz, 1H).