Tetrahydrofuran → 1alpha-(tert-butyldimethylsilyloxy)-3beta-hydroxy-20(S)-(3-ethyl-3-hydroxypentylthio)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 (82.8 mg, 0.143 mmol), 5-bromo-3-ethyl-3-pentanol (139 mg, 0.715 mmol), tetrahydrofuran. (1 ml) and 1M KOH solution in methanol (1 ml) were reacted and worked up, and then the residue was purified by preparative thin layer chromatography (0.5 mm×2, dichloromethane : ethyl acetate=8:1, developed once) to give 99.6 mg of a product, which was directly used in the subsequent reaction because it was difficult to separate from 5-bromo-3-ethyl-3-pentanol.

Provenance & Evidence