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 record

ord-5ee1a15ef2fd4af6bb83a5e932ac3f62

Source dataset

uspto-grants-2001_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06326503B1