反应详情

Ethyl 4-[3-(3,4-dihydroxybenzoyl)indol-1-yl]butanoate (5.70 g) was dissolved in N,N-dimethylformamide (40 ml). α-bromo-p-xylene (3.72 g) and potassium carbonate (2.57 g) were added to the resultant solution and stirred for 3 hours at room temperature. The reaction mixture was poured into 2N HCl and extracted with ethyl acetate. The resultant extract was sequentially washed with saturated sodium bicarbonate solution and brine, and then dried. The solvent was distilled off. The residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=3:1), obtaining 2.77 g of ethyl 4-{3-[3-hydroxy-4-(4-methylphenylmethoxy)benzoyl]indol-1-yl}butanoate (2.77 g) as light brown crystals.

1. extractionextracted with ethyl acetate
2. extractionThe resultant extract
3. washwas sequentially washed with saturated sodium bicarbonate solution and brine
4. customdried
5. distillationThe solvent was distilled off
6. customThe residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=3:1)