Tetrahydrofuran → 1alpha-(tert-Butyldimethylsilyloxy)-3beta-hydroxy-20(S)-(2-hydroxy-2-methylpropylthio)pregna-5,7,16-triene

Participants

Reaction Steps

Under the same conditions as in Example 3, 1α-(tert-butyldimethylsilyloxy)-3β-hydroxy-20(S)-phenoxycarbonylthiopregna-5,7,16-triene (83.0 mg, 0.143 mmol), isobutylene oxide (113 mg, 1.56 mmol), tetrahydrofuran (0.5 ml) and 1M KOH solution in methanol (0.5 ml) were reacted and worked up, and then the residue was purified by preparative thin layer chromatography (0.5 mm×2, hexane:ethyl acetate=1:1, developed once) to give the title compound as a colorless oil (62.3 mg, 82%).

Provenance & Evidence