反应详情

温度

50 °C

A solution of 5 g of the crude 4-(1-adamantyl)-thiophenol obtained above, in 25 ml of absolute ethanol and 25 ml of absolute tetrahydrofurane is added dropwise to a solution of 500 mg of sodium in 20 ml of absolute ethanol whilst stirring in a dry nitrogen atmosphere, and 2.9 ml of 4-bromobutyric acid ethyl ester are then added under the same conditions. After completion of the addition, the mixture is heated to 50°C for 14 hours. It is then evaporated to dryness in vacuo and the evaporation residue is partitioned between 3 times 100 ml of methylene chloride and 100 ml of 2 N hydrochloric acid. The organic phases are washed until neutral, dried over sodium sulphate and evaporated in vacuo. Chromatography of the evaporation residue on 240 g of silica gel, with benzene as the eluant, yields chromatographically pure 4-[4-(1-adamantyl)-phenylthio]-butyric acid ethyl ester in the form of a yellow-brown oil (IR spectrum: C=O band at 1,740 cm-1 (in CH2Cl2)).

1. additionare then added under the same conditions
2. additionAfter completion of the addition
3. customIt is then evaporated to dryness in vacuo
4. customthe evaporation residue is partitioned between 3 times 100 ml of methylene chloride and 100 ml of 2 N hydrochloric acid
5. washThe organic phases are washed until neutral,
6. dry with materialdried over sodium sulphate
7. customevaporated in vacuo