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3.3- Dimethoxy-5a-pregnan

The full account has appeared " of the synthesis of the A °-marine steroid (284). In addition the isolation and synthesis of the related 3iS-hydroxy-A -compound (285) " and the lla-hydroxy-3-oxo-A -compound (286) were reported. In the synthesis of (286) the 17/3-ethenyl group was constructed through exhaustive methylation of the 20-amino-compound followed by Hofmann elimination. Epimerization of pregnenolone at C-17 led to the synthesis of a number of 20-methyl-17a-pregnanes. Syntheses have been reported for the four isomeric 3,ll-diamino-5a-pregnanes, and the 6,19-dimethoxy-3,5-cyclopregnan-20-one (287) was synthesized in model experiments aimed at a strophanthidin synthesis. ... [Pg.256]

Allopregnanedione refluxed 15 min. in methanol containing a trace of p-toluene-sulfonic acid 3,3-dimethoxy-20-oxo-5a-pregnane. Y 87%. F. 3-steroid ketals s. M.-M. Janot, X. Lusinchi, and R. Goutarel, Bl. 1961, 2109. [Pg.65]

See other pages where 3.3- Dimethoxy-5a-pregnan is mentioned: [Pg.96]    [Pg.96]    [Pg.406]    [Pg.57]    [Pg.57]    [Pg.212]    [Pg.96]    [Pg.96]    [Pg.406]    [Pg.57]    [Pg.57]    [Pg.212]    [Pg.407]    [Pg.12]    [Pg.473]   
See also in sourсe #XX -- [ Pg.3 , Pg.6 , Pg.9 , Pg.20 ]

See also in sourсe #XX -- [ Pg.6 , Pg.9 , Pg.9 , Pg.20 ]



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3.3- Dimethoxy-5a-pregnane

3.3- Dimethoxy-5a-pregnane

Pregnan

Pregnane

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