Water → HCID 18770243, compound

Participants

Reaction Steps

To a solution of (3-bromobenzyloxy)-t-butyldimethylsilane (2.207 g, 7.326 mmol) in dry tetrahydrofuran (20 ml) was added n-butyl lithium (4.18 ml, 6.66 mmol, 1.59M tetrahydrofuran solution) at −78° C. over 25 minutes and stirred for 50 minutes. Then to the reaction mixture was added 7-methoxy-3-(4-methoxyphenyl)thiochroman-4-one (1 g, 3.33 mmol) dissolved in tetrahydrofuran at the same temperature over 10 minutes. The reaction mixture was stirred for 20 minutes at −78° C., followed at −15° C. for 12 h and at 0° C. for 8 h. When the reaction was completed, water was added to the reaction solution which was then extracted with ethyl acetate. The extract was dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified with column chromatography (n-hexane:ethyl acetate=8:2) to give 0.49 g (yield: 28%) of the title compound as a colorless oil. In this reaction 0.55 g (55%) of the unreacted starting compound was recovered.

Provenance & Evidence