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Stereoselective synthesis of perhydrobenzo[4.5.6]cholestanes
1992An intramolecular Michael-aldol reaction sequence has been developed for the stereocontrolled synthesis of pentacyclic steroids! with the new six-membered ring attached to the C(4) and C(6) positions. Cholesterol was converted into 3β-hydroxycholest-4-en-6-one by standard methods, and the corresponding 3α-isomer was obtained through Mitsunobu inversion.
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A-Substituted 5β-Steroids. V. Syntheses and Some Reactions of 1-Oxygenated 5β-Cholestanes
Bulletin of the Chemical Society of Japan, 1973Akira Hagitani
exaly
Acetolyses of the epimeric 4-methanesulphonyloxy-5,7β-cyclo-B-homo-5β-cholestanes
Collection of Czechoslovak Chemical Communications, 1974L Kohout, J Fajkoš, Kohout L
exaly
Sapogenins and dimethyldioxirane: A new entry to cholestanes functionalized at the side chain
Tetrahedron Letters, 1994, Paolo Bovicelli, Enrico Mincione
exaly
Cholestanes containing an oxygenated 14α-methyl group
Chemical Communications / Chemical Society, London, 1966exaly