Synthesis of vinca alkaloids and related compounds. Part XCIII. Skeletal rearrangement of cyclovinblastine derivatives: Formation of a novel bisindole system
Bisindole alkaloids of the vinblastine (VLB) type can be oxidized to give a Ψ-aspidosperma-aspidosperma type skeleton via 3'-7'-transannular cyclization. Acid catalysis triggers an aspidospermane→eburnane skeletal rearrangement of these cyclic derivatives, thus giving a novel bisindole system with a Ψ-eburnea-aspidosperma type skeleton. A previously unexplored aspect of this transformation is the observed retention or inversion at C(16') depending on the starting C(16') configuration. The present paper gives a detailed account of the synthetic aspect of this work together with preliminary NMR and CD results concerning the epimerization at C(16').
TREATMENT OF HYPERPROLIFERATIVE DISEASES WITH VINCA ALKALOID N-OXIDE AND ANALOGS
The present invention relates to vinca alkaloid and analog N-oxides having activity for treating hyperproliferative disorders. Further, the invention relates to pharmaceutical compositions and methods of using vinca alkaloid and analog N-oxides, alone or in combination with one or more other active agents or treatments, to treat hyperproliferative disorders.
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(2008/06/13)
Biosynthesis of the indole alkaloids. Cell-free systems from Catharanthus roseus plants