反应详情

To a mixed solution of water (1.6 mL)-concentrated sulfuric acid (1.6 mL) was added 3-nitrothiophenol (0.5 g), and the mixture was stirred at room temperature for 1 hour. To the mixture was added a solution of α-methylstyrene (0.38 g) in tetrahydrofuran (1.6 mL), and the mixture was stirred at room temperature for 30 minutes. The reaction mixture was poured into ice water, and the resulting mixture was extracted with ethyl acetate. The extract was washed with water, a saturated aqueous sodium hydrogen carbonate solution and brine successively, and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure, and the residue was purified by column chromatography on silica gel (eluent: n-hexane−n-hexane/ethyl acetate=3/2) to give 3-(1-methyl-1-phenylethylthio)nitrobenzene (0.88 g). This material was dissolved in tetrahydrofuran (10 mL). To the solution were added methanol (10 mL), nickel (II) bromide (35 mg) and sodium borohydride (0.37 g) under ice-cooling, and the mixture was stirred at the same temperature for 30 minutes. Then the mixture was stirred at room temperature for 1 hour. The reaction mixture was diluted with ethyl acetate, and the resulting mixture was washed with a saturated aqueous sodium hydrogen carbonate solution, water and brine successively, and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure, and the residue was purified by column chromatography on silica gel (eluent: n-hexane−n-hexane/ethyl acetate=3/2) to give the title compound (0.69 g).

1. stirringthe mixture was stirred at room temperature for 30 minutes
2. extractionthe resulting mixture was extracted with ethyl acetate
3. washThe extract was washed with water
4. dry with materiala saturated aqueous sodium hydrogen carbonate solution and brine successively, and dried over anhydrous magnesium sulfate
5. customThe solvent was removed under reduced pressure
6. customthe residue was purified by column chromatography on silica gel (eluent: n-hexane−n-hexane/ethyl acetate=3/2)