反应详情

A solution of 3-Hydroxy-4-methoxybenzoic acid (25 g, 148.67 mmol) and p-Toluenesulfonic acid monohydrate (3.17 g, 16.66 mmol) in abs ethanol (300 ml) was refluxed for 6 hours or until all the starting material is consumed. The reaction mixture was concentrated, diluted with EtOAc (60 ml) and washed with water (20 ml). The organic layer was dried over Na2SO4, filtered, concentrated, and purified by flash chromatography on a silica gel column (hex: ethyl acetate 2:1) to give the title compound.

1. customis consumed
2. concentrationThe reaction mixture was concentrated
3. additiondiluted with EtOAc (60 ml)
4. washwashed with water (20 ml)
5. dry with materialThe organic layer was dried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated
8. custompurified by flash chromatography on a silica gel column (hex: ethyl acetate 2:1)