反应详情

温度

20 °C

A solution of 1.6M n-butyllithium in hexane (18.5 ml) was added dropwise to a stirred solution of dibenzofuran (5.0 g) in anhydrous THF (25 ml) at −78° C. under a nitrogen atmosphere. The resulting suspension was allowed to warm to 20° C. where it was stirred for 3 h. It was then cooled to −78° C. and added to a mixture of excess solid carbon dioxide in diethyl ether (250 ml) under a nitrogen atmosphere. The resulting white suspension was allowed to stand for 1 h at 20° C. and was then diluted with 2M sodium hydroxide (500 ml). The aqueous extract was washed with ether (3×200 ml), acidified to pH 1 with 6M hydrochloric acid and extracted with ethyl acetate (3×200 ml). The combined organic extracts were washed with brine (50 ml), dried over magnesium sulphate and evaporated in vacuo to give the title compound as a white solid (3.64 g, 58%). LCMS: Rt 5.06 min; m/z 213 (MH+).

1. temperatureIt was then cooled to −78° C.
2. waitto stand for 1 h at 20° C.
3. extractionThe aqueous extract
4. washwas washed with ether (3×200 ml)
5. extractionextracted with ethyl acetate (3×200 ml)
6. washThe combined organic extracts were washed with brine (50 ml)
7. dry with materialdried over magnesium sulphate
8. customevaporated in vacuo