The spirostanic side chain of pennogenin can be quantitatively transformed under mild acidic conditions in a 22-oxocholestanic framework through a one step procedure. This methodology is the shortest way to afford the 3,16,26- trihydroxy-22-oxocholestanic derivative, analogue of the protected aglycon of the potent antitumor agent OSW-1. The primary hydroxyl group at C-26 could be selectively transformed.
Keywords: Acetolysis, extraction, OSW-1, pennogenin, sapogenin side chain, spirostan, saponins, cardiovascular, gastrointestinal, hydroxysapogenin
Rights & PermissionsPrintExport