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Vincamajine 77 -oxide

Oxidation of vincamajine (43) with CrOj in pyridine leads to voachalotinal (148) I3I, 170) (Scheme 15). [Pg.44]

Following a similar route. Wearing and Yu et al. also synthesized (—)-ll-methoxy-17-epi-vincamajine (298) from (- -)-Na-methyl-16-ep -gardneral (280) in eight steps (Scheme 24). " In this synthesis all the steps were similar to those used for the synthesis of (—)-vincamajinine (291), except the Dess—Martin periodinane oxidation of the diol intermediate could be achieved in one pot to afford the P-oxoaldehyde in 65% yield. Overall (—)-ll-methoxy-17-ep/-vincamajine (298) was obtained in 8.4% yield in 14 reaction steps (from Na-methyl-6-methoxy-D-tryptophan). [Pg.163]

MAURI LOUNASMAA AND PIRJO HANHINEN D. OXIDATION OF VINCAMAJINE TO VOACHALOTINAL... [Pg.44]

See other pages where Vincamajine 77 -oxide is mentioned: [Pg.133]    [Pg.800]    [Pg.343]    [Pg.44]    [Pg.44]    [Pg.146]    [Pg.74]    [Pg.76]    [Pg.106]    [Pg.106]    [Pg.129]    [Pg.136]    [Pg.44]   
See also in sourсe #XX -- [ Pg.106 ]



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Vincamajine

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Voachalotinal, from vincamajine oxidation plant origin

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