Sodium hydride → 1alpha,3beta-bis(tert-butyldimethylsilyloxy)-20(S)-(4-ethyl-4-triethylsilyloxy-2-hexynyloxy)pregna-5,7,16-triene

Participants

Reaction Steps

Under the same conditions as in Example 83, 1α,3β-bis(tert-butyldimethylsilyloxy)-20(S)-hydroxypregna-5,7,16-triene (60.0 mg, 0.107 mmol), sodium hydride (60%, 21.0 mg, 0.525 mmol), 15-crown-5 (10 μl) and 1-bromo-4-ethyl-4-triethylsilyloxy-2-hexyne (134 mg, 0.420 mmol) were reacted in tetrahydrofuran (1 ml) and worked up, and then the residue was purified by preparative thin layer chromatography (0.5 mm×2, hexane:ethyl acetate=40:1, developed once) to give the title compound as a colorless oil (79.0 mg, 92%).

Provenance & Evidence