反应详情

A solution of 4-benzyloxy-3,5-dichloro-benzoic acid methyl ester (CAB02115, 7.20 g, 23.14 mmol) in THF (20 mL) was added slowly with a syringe to a suspension of lithium aluminium hydride (1.50 g, 39.5 mmol) in THF (40 mL). The reaction mixture was stirred for 30 minutes at room temperature and then carefully quenched by addition of 2N sodium hydroxide solution in water. After 20 minutes stirring the colour of the mixture turned from grey to white. The white precipitate was filtered off, the filtrate was dried over sodium sulphate and concentrated under reduced pressure. The residue was recrystallised from dichloromethane/hexane. Yield: 5.83 g (89%) white powder. 1H-NMR (400 MHz, CDCl3) δ=1.85 (t, J=5.9 Hz, 1H, —OH), 4.63 (d, J=5.9 Hz, 2H), 5.04 (s, 2H), 7.33 (s, 2H), 7.35-7.44 (m, 3H), 7.55-7.59 (m, 2H). 13C-NMR (100 MHz, CDCl3) δ=64.05, 75.03, 127.36, 128.70, 128.75, 129.91, 136.39; 138.64, 150.32.

1. customcarefully quenched by addition of 2N sodium hydroxide solution in water
2. stirringAfter 20 minutes stirring the colour of the mixture
3. filtrationThe white precipitate was filtered off
4. dry with materialthe filtrate was dried over sodium sulphate
5. concentrationconcentrated under reduced pressure
6. customThe residue was recrystallised from dichloromethane/hexane