反应详情

Sodium hydride (1.1 g of an 80% dispersion in oil) was added, with vigorous stirring to a solution of (4-hydroxyphenyl)propan-2-one, ethylene ketal (6.8 g) in dimethylsulphoxide (50 ml). After 30 minutes, methyl 5 nitrofuran-2-carboxylate (5 g) was added and the resulting mixture was stirred and heated at 80°-90° C. for 10 hr. The cooled reaction mixture was poured into ice-water and extracted into diethylether. The organic layer was washed with 5% potassium hydroxide solution and water, dried (MgSO4) and evaporated to an oil which was chromatographed on silica gel. Elution with chloroform gave methyl 5-[4-acetonylphenoxy]-furan-2-carboxylate, ethylene ketal (3.3 g) which was taken up in a 1:1 mixture of methanol and 2N hydrochloric acid and stirred at ambient temperature for 4 hr. Evaporation of the methanol and extraction of the aqueous residue into dichloromethane gave an oil which was chromatographed on silica gel. Elution with chloroform gave methyl 5-[4-acetonylphenoxy]furan-2-carboxylate.

1. temperatureheated at 80°-90° C. for 10 hr
2. customThe cooled reaction mixture
3. extractionextracted into diethylether
4. washThe organic layer was washed with 5% potassium hydroxide solution and water
5. dry with materialdried (MgSO4)
6. customevaporated to an oil which
7. customwas chromatographed on silica gel
8. washElution with chloroform