Title of article :
On reactions of spirostane sapogenins with benzeneseleninic anhydride
Author/Authors :
Izabella Jastrz?bska، نويسنده , , Aneta Dobrogowska، نويسنده , , Ewa Lutosta?ska، نويسنده , , Jacek W. Morzycki، نويسنده ,
Issue Information :
هفته نامه با شماره پیاپی سال 2010
Abstract :
Direct dehydrogenation of spirostane sapogenins with benzeneseleninic anhydride/iodoxybenzene afforded the Δ22 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.
Keywords :
Benzeneseleninic anhydride , Spirostane , Sapogenin , Oxidation , rearrangement
Journal title :
Tetrahedron
Journal title :
Tetrahedron
