反应详情

温度

40 °C

5-(1,3-Dioxolan-2-ylmethyl)-2-benzofuran-1(3H)-one (61 g, 280 mmol) was combined with water (2.2 L) in a 5 L round bottomed flask equipped with a Claisen adapter, thermocouple, stir bar and nitrogen bubbler. Aqueous HCl solution (2M, 1.14 L, 2.29 mol) was added and the resulting mixture was heated at 40° C. for 8 h. Then the mixture was stirred overnight at room temperature. The mixture was extracted three times with 2 L of ethyl acetate. The combined organic layers were concentrated to give (1-oxo-1,3-dihydro-2-benzofuran-5-yl)acetaldehyde. MS: m/z 177 (M+1)+.

1. customequipped with a Claisen adapter
2. stirringThen the mixture was stirred overnight at room temperature
3. extractionThe mixture was extracted three times with 2 L of ethyl acetate
4. concentrationThe combined organic layers were concentrated