反应详情

To a solution of 2′-Nitro-4′-thiocyano-p-toluenesulfonanilide (5.0 g (14.3 mmol) in methanol (20 ml), sodium borohydride (2.80 g (66.7 mmol)) was added under cooling with ice and with stirring. After 30 minutes' stirring, to the resulting mixture, methyl iodide (3.67 ml (59.0 mmol)) was added dropwise under cooling with ice and the mixture was then stirred at room temperature for 20 hours. Then, water was added to the reaction mixture and the resulting mixture was extracted with ethyl acetate. The extract was washed with a saturated aqueous solution of sodium chloride, dried over anhydrous magnesium sulfate, filtered and concentrated. The residue was then subjected to silica gel column chromatography with ethyl acetate-hexane (1:4) as eluent. The resulting crystals were recrystallized from ethyl acetate to give 2.27 g (47%) of 2′-nitro-4′-methylthio-p-toluenesulfonanilide as orange crystals.

1. temperatureunder cooling with ice
2. additionwas added dropwise
3. temperatureunder cooling with ice
4. stirringthe mixture was then stirred at room temperature for 20 hours
5. extractionthe resulting mixture was extracted with ethyl acetate
6. washThe extract was washed with a saturated aqueous solution of sodium chloride
7. dry with materialdried over anhydrous magnesium sulfate
8. filtrationfiltered
9. concentrationconcentrated
10. customThe resulting crystals were recrystallized from ethyl acetate