| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5224035 | Tetrahedron | 2010 | 6 Pages |
Abstract
Direct dehydrogenation of spirostane sapogenins with benzeneseleninic anhydride/iodoxybenzene afforded the Î22 derivatives in low yields. The reactions catalyzed by BF3/Et2O produced the 23-oxo-sapogenins in addition to their 22-oxo-23-spiro-isomers. The reactions of sapogenins with benzeneseleninic anhydride carried out in the presence of TiCl4 afforded products chlorinated at C23.
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Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Izabella JastrzÄbska, Aneta Dobrogowska, Ewa LutostaÅska, Jacek W. Morzycki,