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- W1990914375 abstract "A variety of Δ5-steroids were converted into α, β-unsaturated 7-ketones using a modification of the already known method of t-butyl hydroperoxide in the presence of copper iodide in acetonitrile. The same alteration was applied to another oxidative procedure, which had never been used before on steroidal substrates. The same oxidative agent was used in the presence of copper iodide, and tetra-n-butylammonium bromide was used as a phase-transfer catalyst in a two-phase system of water/methylene chloride. It was found that the allylic oxidation proceeded more efficiently when t-butyl hydroperoxide was added to the reaction mixture in portions. The initial addition of the total amount of oxidant or its dropwise addition afforded low yields. This observation contributes to the investigation of the reaction mechanism, and high-yield conversions of steroidal 5,6-enes into the corresponding conjugated 7-ones in short reaction times are reported." @default.
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- W1990914375 date "2003-05-01" @default.
- W1990914375 modified "2023-10-15" @default.
- W1990914375 title "Optimization of the allylic oxidation in the synthesis of 7-keto-Δ5-steroidal substrates" @default.
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- W1990914375 doi "https://doi.org/10.1016/s0039-128x(03)00042-4" @default.
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