反应详情

A mixture of 300 mg (2.75 mmol, Aldrich) of 4-aminophenol, 1.5 g (90%, 8.4 mmol, Aldrich) of 2,6-dihydroxynaphthalene and 1.0 g (9.6 mmol, Aldrich), of sodium bisulfite in 30 ml of H2O was refluxed for 18 hours. The reaction mixture was cooled, added to 30 ml of H2O and extracted with two 25 ml portions of ethyl acetate. The organic extracts were combined, dried (MgSO4), and concentrated in vacuo to give a solid. The crude solid was purified by flash chromatography (15×5.0 cm, 1:2 EtOAc/pet ether) followed by recrystallization (EtOAc/pet ether) to afford 215 mg (31%) of title compound as pale pink crystals, m.p. 195°-196°.

1. temperatureThe reaction mixture was cooled
2. extractionextracted with two 25 ml portions of ethyl acetate
3. dry with materialdried (MgSO4)
4. concentrationconcentrated in vacuo
5. customto give a solid
6. customThe crude solid was purified by flash chromatography (15×5.0 cm, 1:2 EtOAc/pet ether)
7. customfollowed by recrystallization (EtOAc/pet ether)