反应详情

Zinc (11.6 g) was added to a solution of (±)-(3aR*,7aS*)-7a-(2-fluorophenyl)hexahydropyrano[3,4-c]isoxazole (3.95 g) in acetic acid (78.4 ml), and the mixture was stirred at room temperature overnight. The insoluble matter was removed by filtration through celite, and the solvent was evaporated under reduced pressure. An ice-cooled 0.5 N sodium hydroxide solution was added to the residue. The aqueous layer was extracted with ethyl acetate and a mixed solution of ethyl acetate and tetrahydrofuran. The organic layers were combined and washed with brine and then dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography to obtain the title compound (3.45 g).

1. customThe insoluble matter was removed by filtration through celite
2. customthe solvent was evaporated under reduced pressure
3. temperatureAn ice-cooled 0.5 N sodium hydroxide solution
4. additionwas added to the residue
5. extractionThe aqueous layer was extracted with ethyl acetate
6. washwashed with brine
7. dry with materialdried over anhydrous magnesium sulfate
8. customThe solvent was evaporated under reduced pressure
9. customthe residue was purified by silica gel column chromatography