反应详情

Compound 14a (860 mg) was dissolved in tetrahydrofuran (10.0 ml), and the reaction mixture was ice-cooled. Diisobutylaluminum hydride/toluene solution (0.98 mol/l, 5.0 ml) was added thereto, and the mixture was stirred under ice-cooling for 1 hour. After adding a 1N hydrochloric acid aqueous solution, the reaction mixture was returned to room temperature and extracted with ethyl acetate. The organic layer was washed with a 1N hydrochloric acid aqueous solution and saturated sodium-hydrogencarbonate aqueous solution, and then dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure. The obtained residue was recrystallized with a mixed solvent of tert-butylmethylether and n-heptane to obtain Compound 14b (554 mg, 86%) as a white solid.

1. temperaturecooled
2. temperaturecooling for 1 hour
3. customwas returned to room temperature
4. extractionextracted with ethyl acetate
5. washThe organic layer was washed with a 1N hydrochloric acid aqueous solution and saturated sodium-hydrogencarbonate aqueous solution
6. dry with materialdried over anhydrous sodium sulfate
7. distillationThe solvent was distilled off under reduced pressure
8. customThe obtained residue was recrystallized with a mixed solvent of tert-butylmethylether and n-heptane