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Acetoxy-5a-pregnan-12,20-dione

The preparation of 12-oxygenated conanine derivatives and a partial synthesis of dihydroholarrhenine (4) have been reported. 3/3-Acetoxy-5a-pregnan-12,20-dione ethylene acetal (5 a), prepared from hecogenine acetate by published procedures, was transformed to the oxime (5b) which was reduced by sodium in propanol to the epimeric 20-amino-derivatives, with hydrolysis of the 3-acetoxy-group. Separation of the 20o -epimer (6a) was effected by crystallization and column chromatography. Reduction of the cathylate (6b) gave (6c) which was oxidized to the... [Pg.269]

See other pages where Acetoxy-5a-pregnan-12,20-dione is mentioned: [Pg.86]    [Pg.52]    [Pg.397]    [Pg.354]    [Pg.86]    [Pg.52]    [Pg.397]    [Pg.354]    [Pg.82]    [Pg.50]    [Pg.456]   
See also in sourсe #XX -- [ Pg.397 ]



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