Exploratory studies towards a total synthesis of the unusual bridged tetracyclic Lycopodium alkaloid lycopladine H

[摘要] A strategy for a total synthesis of the structurally novel Lyco podium alkaloid lycopladine H has been investigated. Key steps that have been tested include: 1. a regioselective Diels-Alder cycloaddition of nitroethylene with an o-quinone ketal to produce the bicyclo[2.2.2]octane moiety of the alkaloid; 2. a stereoselective Henry reaction to generate the requisite functionality and configuration at C-5; 3. a stereoselective catalytic hydrogenation of a trisubstituted alkene to set the C-15 methyl configuration. (C) 2011 Elsevier Ltd. All rights reserved.

[发布日期] 2011-12-30

[关键词] Natural product;Alkaloid;Diels-Alder;Henry reaction;Catalytic hydrogenation