反应详情

A solution of 2-(4,4-dimethyl-chroman-7-yl)-heptan-1-ol (0.366 g, 1.32 mmole) in 27 mL of THF was treated with 0.222 g of methyl 4-hydroxybenzoate, 0.382 g of triphenylphosphine and 0.23 mL of diethyl azodicarboxylate (DEAD). The reaction mixture was heated at reflux for two hours, diluted with 50 mL of ether and then washed with two 25 mL portions of water and 25 mL of saturated aqueous sodium chloride solution. The organic phase was dried over MgSO4, filtered and concentrated in vacuo to give a yellow oil. The product was purified by flash chromatography (SiO2, 7% ethyl acetate in hexanes) to yield 0.474 g of 4-[2-(4,4-dimethyl-chroman-7-yl)-heptyloxy]-benzoic acid methyl ester, as a pale yellow oil.

1. temperatureThe reaction mixture was heated
2. temperatureat reflux for two hours
3. washwashed with two 25 mL portions of water and 25 mL of saturated aqueous sodium chloride solution
4. dry with materialThe organic phase was dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customto give a yellow oil
8. customThe product was purified by flash chromatography (SiO2, 7% ethyl acetate in hexanes)