反应详情

温度

0 °C

Sodium borohydride (3.27 g, 86.3 mmol) was added to a solution of 5,6-dihydro-5,5-dimethyl-7H-thieno [3,2-b]-pyran-7-one (12.1 g, 66.4 mmol) in ethanol (100 mL) and the resultant mixture was stirred at rt for 17 h. The mixture was poured into water (400 mL) and extracted with dichloromethane (2×100 mL). The dichloromethane solution was washed with water (5×), dried over sodium sulfate, and filtered. Molecular sieves (12 g) and p-toluenesulfonic acid (1.2 g, 6.3 mmol) was added to the resultant solution and stirred at 0° C. for 1.5 h. The reaction mixture was filtered, washed with saturated aqueous sodium bicarbonate and dried over sodium sulfate. The solvent was evaporated in vacuo to give the product, 11.0 g (99%), as a red oil which was identical in all respects to the product described in Method A.

1. extractionextracted with dichloromethane (2×100 mL)
2. washThe dichloromethane solution was washed with water (5×)
3. dry with materialdried over sodium sulfate
4. filtrationfiltered
5. filtrationThe reaction mixture was filtered
6. washwashed with saturated aqueous sodium bicarbonate
7. dry with materialdried over sodium sulfate
8. customThe solvent was evaporated in vacuo
9. customto give the product, 11.0 g (99%)