Tetrahydrofuran → 1alpha-(tert-butyldimethylsilyloxy)-3beta-hydroxy-20(S)-(4-ethyl-4-hydroxyhexylthio)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 (84.3 mg, 0.145 mmol), 6-bromo-3-ethyl-3-hexanol (152 mg, 0.725 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, hexane:ethyl acetate=2:1, developed twice) to give 76.4 mg of a product, which was directly used in the subsequent reaction because it was difficult to separate from 6-bromo-3-ethyl-3-hexanol.

Provenance & Evidence