反应详情

A mixture of 2,5-dihydroxybenzoic acid (3.9 g), 1,8-diazobicyclo[5.5.0]undec-7-ene (3.8 g), 8-chlorooctyl tetrahydro-2-furancarboxylate (6.0 g), potassium iodide (30.2 g) and acetonitrile (110 ml) was heated, under reflux for 72 h. The cooled reaction mixture was added to water (500 ml) and extracted with ethyl acetate (3×100 ml). The combined organic layers were washed with 1N-hydrochloric acid (150 ml) and water (2×15 ml), dried over magnesium sulphate and filtered. The solvent was removed in vacuum. The residue (8.0 g) was purified by column flash chromatography on silica gel using toluene/ethyl acetate (3:1) as eluent, to give 8-[(2,5-dihydroxybenzoyl)oxy]octyltetrahydro-2-furancarboxylate as colourless oil.

1. temperaturewas heated
2. temperatureunder reflux for 72 h
3. customThe cooled reaction mixture
4. extractionextracted with ethyl acetate (3×100 ml)
5. washThe combined organic layers were washed with 1N-hydrochloric acid (150 ml) and water (2×15 ml)
6. dry with materialdried over magnesium sulphate
7. filtrationfiltered
8. customThe solvent was removed in vacuum
9. customThe residue (8.0 g) was purified by column flash chromatography on silica gel