反应详情

温度

80 °C

A suspension of 3,4-dihydroxybenzaldehyde (5.0 gm, 0.0362 mol), anhydrous potassium carbonate (6.0 gm, 0.0434 mol) and cyclopentyl bromide (6.5 gm, 0.0434 mol) in dry DMF (50 ml) was heated and stirred at 80° C. for 24 hrs. Reaction mixture was then cooled and diluted with water (500 ml), acidified with 1N HCl and extracted with ethyl acetate (3×100 ml). The ethyl acetate extract was washed 5% sodium bicarbonate and brine and dried over anhydrous sodium sulfate. The dried extract on concentration afforded a residue which was purified by silica gel chromatography using 10% ethyl acetate in petroleum ether as the eluent to provide 5.0 gm of the title product as white solid. mp: 87-89° C.

1. temperaturewas heated
2. customReaction mixture
3. temperaturewas then cooled
4. extractionextracted with ethyl acetate (3×100 ml)
5. extractionThe ethyl acetate extract
6. washwas washed 5% sodium bicarbonate and brine
7. dry with materialdried over anhydrous sodium sulfate
8. extractionThe dried extract on concentration
9. customafforded a residue which
10. customwas purified by silica gel chromatography