Sodium hydride → 1alpha,3beta-bis(tert-butyldimethylsilyloxy)-20(R)-{(E)-(4-methyl-4-triethylsilyloxy-2-pentenyloxy)}pregna-5,7,16-triene

Participants

Reaction Steps

Under the same conditions as in Example 83, 1α,3β-bis(tert-butyldimethylsilyloxy)-20(R)-hydroxypregna-5,7,16-triene (60.0 mg, 0.107 mmol), sodium hydride (60%, 17.1 mg, 0.428 mmol), 15-crown-5(10 μl) and (E)-1-bromo-4-methyl-4-triethylsilyloxy-2-pentene (116 mg, 0.375 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=30:1, developed once) to give the title compound as a colorless oil (73.4 mg, 89%).

Provenance & Evidence