[EN] SYNTHESIS OF POLYHYDROXYLATED ALKALOIDS<br/>[FR] SYNTHÈSE DES ALCALOÏDES POLYHYDROXYLÉS
申请人:MNL PHARMA LTD
公开号:WO2006008493A1
公开(公告)日:2006-01-26
A process for the production of a polyhydroxylated bicyclic (e.g. pyrrolizidine such as casuarine (10), indolizidine or quinolizidine) alkaloid comprises the cyclisation of a pyrrolidine or piperidine intermediate having three or more free hydroxyl groups.
Immunotherapy comprises administration of an alkaloid at a dose sufficient to induce IL-2 production in dendritic cells in a patient. The alkaloid induces the production of IL-2 in dendritic cells. The alkaloids need not be naturally occurring, and may be synthetic analogues or derivatives of naturally occurring counterparts. Such analogues or derivatives are preferably pharmaceutically acceptable analogues, salts, isomers or derivatives as herein defined. However, preferred alkaloids are phytochemicals. Such phytochemicals may be isolated from natural sources or synthesised in vitro. Particularly preferred are alkaloids is selected from piperidine alkaloids; pyrroline alkaloids; pyrrolidine alkaloids; pyrrolizidine alkaloids; indolizidine alkaloids and nortropane alkaloids.
Synthesis of casuarines [pentahydroxylated pyrrolizidines] by sodium hydrogen telluride-induced cyclisations of azidodimesylates
作者:Andrew A. Bell、Lea Pickering、Alison A. Watson、Robert J. Nash、Yuan T. Pan、Alan D. Elbein、George W.J. Fleet
DOI:10.1016/s0040-4039(97)01306-3
日期:1997.8
The key step in the synthesis of four diastereomers of casuarine from eight carbon sugar lactones is the efficient reduction of open chain azidodimesylates by sodium hydrogen telluride [Suzuki-Takaoka reduction] to allow the formation of the pyrrolizidine nucleus by bicyclisation. This is the first report of the synthesis of such highly oxygenated pyrrolizidines. (C) 1997 Elsevier Science Ltd.