反应详情

13.0 Grams (45.7 mmol) of 5-methyl-6-ethoxycarbonyl-8-chlorothiochroman-4-one was dissolved in 50 ml of ethanol, and 1.73 g (45.7 mmol, 1 eq.) of sodium borohydride was added with an ice bath cooling. The reaction mixture was stirred for 1 hour. After the completion of the reaction, 20 ml of water was added, and the solvent was distilled off. Then, the reaction mixture was extracted with ethyl acetate twice. An organic layer was washed with a saturated sodium chloride aqueous solution and dried over anhydrous sodium sulfate, and the solvent was distilled off to give 14.0 g (yield 100%) of 4-hydroxy-5-methyl-6-ethoxycarbonyl-8-chlorothiochroman.

1. temperaturecooling
2. additionwas added
3. distillationthe solvent was distilled off
4. extractionThen, the reaction mixture was extracted with ethyl acetate twice
5. washAn organic layer was washed with a saturated sodium chloride aqueous solution
6. dry with materialdried over anhydrous sodium sulfate
7. distillationthe solvent was distilled off