Tetrabutylammonium Fluoride → 1alpha,3beta-dihydroxy-20(S)-(3-hydroxy-3-methylbutylthio)pregna-5,7,16-triene

To a solution of 1α-(tert-butyldimethylsilyloxy)-3β-hydroxy-20(S)-(3-hydroxy-3-methylbutylthio)pregna-5,7,16-triene (58.5 mg, 0.107 mmol) in tetrahydrofuran (3 ml) was added 1M tetra-n-butylammonium fluoride solution in tetrahydrofuran (2 ml), and the mixed solution was heated under reflux for 4 hours. After completion of the reaction, the reaction solution was diluted with ethyl acetate, and washed with ice-cooled 0.5 N hydrochloric acid, saturated aqueous sodium bicarbonate solution and brine successively, and the organic layer was dried over magnesium sulfate. The solvent was removed under reduced pressure, and the resulting residue was purified by preparative thin layer chromatography (0.5 mm×2, dichloromethane:ethanol=7:1, developed once) to give the title compound as a pale yellow oil (41.8 mg, 90%).

1. temperaturethe mixed solution was heated
2. temperatureunder reflux for 4 hours
3. customAfter completion of the reaction
4. washwashed with ice-
5. temperaturecooled 0.5 N hydrochloric acid, saturated aqueous sodium bicarbonate solution and brine successively
6. dry with materialthe organic layer was dried over magnesium sulfate
7. customThe solvent was removed under reduced pressure
8. customthe resulting residue was purified by preparative thin layer chromatography (0.5 mm×2, dichloromethane

ORD-Eintrag

ord-e80388e786ae41d888bd3d9759b1d421

Quelldatensatz

uspto-grants-2001_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06184398B2