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A2-Cholestene

Rh(PPh3)3CI] Phosphinated 2% cross-linked polystyrene Cyclohexene 1-Hexene A2-Cholestene Octadecene Cyclooctene Cyclododecene 37... [Pg.206]

Oxidation of steroidal alkenesf Mercuric acetate (2 eq.) reacts with A14-steroids (1) to give as the major product A8<14,-15-ones (2) rather than the expected allylic acetates, 16 -acetoxy-14-enes. The tetrasubstituted bond of A8<14,-cholestene is unreactive under the same conditions. A2-Cholestene (disubstituted) reacts only slowly to give A1-cholestene-3-one in 20 % yield with 70% recovery of the starting material. This unexpected reaction of steroidal trisubstituted double bonds may proceed through an allylic acetoxylation followed by an oxidation step. [Pg.164]

Disubstituted steroid olefins are converted by the reagent into a-azido ketones. Thus A2-cholestene (9) reacts with the reagent in dichloromethane at —20° to give 3a-azidocholestanone-2 (10) in 50-60 % yield. A possible mechanism is formulated. The... [Pg.476]

It reacts with a solution of A2-cholestene in acetonitrile to give 3 -iodo-2/3-hydroxy-cholestane nitrate ester (2). When dinitrogen tetroxide was treated in chloroform with iodine and A2-cholestene was added, the same 3 -iodo-2/3-hydroxycholestane... [Pg.116]

Reactions with steroidal monoolefins Photooxygenation of A2-3-methyl-5with methanolic sodium iodide, gives the two allylic alcohols (2) and (3). Similar oxidation of the isomeric A2-2-methyl-5a-cholestene yields the... [Pg.519]

See other pages where A2-Cholestene is mentioned: [Pg.59]    [Pg.210]    [Pg.173]    [Pg.319]    [Pg.269]    [Pg.426]    [Pg.59]    [Pg.210]    [Pg.173]    [Pg.319]    [Pg.269]    [Pg.426]    [Pg.395]    [Pg.511]    [Pg.517]    [Pg.441]   
See also in sourсe #XX -- [ Pg.173 ]

See also in sourсe #XX -- [ Pg.38 , Pg.224 , Pg.225 , Pg.298 , Pg.299 ]

See also in sourсe #XX -- [ Pg.179 , Pg.180 ]



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2-Cholestene

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