反应详情

温度

15 °C

1.9 g (50.5 mmol) of sodium borohydride was suspended in 40 ml of water. To the suspension was dropwise added, at 10 to 15° C., a THF (4 ml) solution of the above-produced 3,4-dichloroisothiazole-5-carbonyl chloride. The mixture was stirred at 15° C. for 30 minutes. Then, an aqueous citric acid solution was added to the mixture to make it weakly acidic, followed by extraction with ethyl acetate. The organic layer was washed with water, dried over anhydrous magnesium sulfate, and concentrated. The resulting crystals were washed with hexane to obtain 3.0 g (yield: 81%) of (3,4-dichloroisothiazol-5-yl)methanol as colorless crystals (melting point: 94 to 95° C.).

1. additionTo the suspension was dropwise added, at 10 to 15° C.
2. extractionfollowed by extraction with ethyl acetate
3. washThe organic layer was washed with water
4. dry with materialdried over anhydrous magnesium sulfate
5. concentrationconcentrated
6. washThe resulting crystals were washed with hexane