反应详情

To a solution of 2-(3-bromophenyl)-1,3-dioxolane (3.04 g, 13.28 mmol) in dry tetrahydrofuran (35 ml) was added n-butyl lithium (8.37 ml, 13.316 mmol, 1.59 mol/l tetrahydrofuran solution) dropwise as −78° C. over 10 minutes and stirred for 50 minutes at the same temperature. Then to the reaction mixture was added 7-methoxy-3-(4-methoxyphenyl)thiochroman-4-one (2 g, 6.658 mmol) dissolved in tetrahydrofiuran at the same temperature over 10 minutes. The reaction mixture was stirred for 6 h at −78° C. and followed at −10C for 2 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=8:1 to 7:3) to give 1.50 g (yield: 50%) of the title compound as a colorless oil. In this reaction, 0.77 g (38%) of the unreacted starting compound was recovered.

1. dissolutiondissolved in tetrahydrofiuran at the same temperature over 10 minutes
2. stirringThe reaction mixture was stirred for 6 h at −78° C.
3. custom−10C for 2 h
4. extractionwas then extracted with ethyl acetate
5. dry with materialThe extract was dried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified with column chromatography (n-hexane:ethyl acetate=8:1 to 7:3)