反应详情

3-Hydroxybenzaldehyde (900 mg, 7.37 mmol) is treated with 2.16 g (11.05 mmol) of ethyl 4-bromobutyrate, 3.06 g (22.11 mmol) of potassium carbonate, and a catalytic amount (110 mg 0.74 mmol) of sodium iodide under the same conditions as in Preparation 3 to give a yellow oil. Purification by flash chromatography using hexane/ethyl acetate (10:1) gives 1.61 g of 4-(3-formylphenoxy)butanoic acid, ethyl ester as a light yellow oil. The 1H NMR (300 MHz, CDCl3) is consistent with the desired product; IR (neat) 1730, 1700, 1600, 1580 cm-1 ; MS (CI low res) m/e 237 (M+H), 191, 115.

1. customto give a yellow oil
2. customPurification by flash chromatography