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Lactonization, from amides Chemistry

Two novel complex hydrides are likely to find applications in steroid chemistry lithium perhydro-9b-boraphen yl hydride affords unusually high proportions of axial alcohols in model compounds sodium bis(methoxyethoxy)aluminium dihydride, Na (MeOCH2CH20)JAlH2, a very safe and convenient substitute for lithium aluminium hydride, readily reduces not only ketones but also acids, nitro-compounds, oximes, amides, lactones, etc. An improved procedure for Clemmensen reduction of steroid ketones involves saturating an ethereal solution with hydrogen chloride while stirring with zinc. 5a-Cholestane was obtained from the 3-one in 89% yield. ... [Pg.319]

See other pages where Lactonization, from amides Chemistry is mentioned: [Pg.308]    [Pg.257]    [Pg.517]    [Pg.105]    [Pg.53]    [Pg.263]    [Pg.263]    [Pg.281]    [Pg.8]    [Pg.175]    [Pg.89]    [Pg.357]    [Pg.16]    [Pg.157]    [Pg.439]   
See also in sourсe #XX -- [ Pg.1887 ]



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