We have developed a concise synthesis of dielsiquinone 1, a potent cytotoxic agent related to anthraquinones. Electrochemical studies have shown that dielsiquinone is reduced to a semiquinone radical that does not react with O-2 to generate toxic reactive oxygen species. These results strongly suggest that I should be less cardiotoxic than anthracyclines used in clinic and may therefore provide the basis for the development of safer anticancer drugs. (c) 2005 Elsevier Ltd. All rights reserved.
Using the Pummerer Cyclization−Deprotonation−Cycloaddition Cascade of Imidosulfoxides for Alkaloid Synthesis
作者:Albert Padwa、Todd M. Heidelbaugh、Jeffrey T. Kuethe
DOI:10.1021/jo9915729
日期:2000.4.1
opening and formation of a 5-acetoxy-substituted 2(1H)-pyridone. This six-ring heterocyclic system constitutes a valuable building block for the synthesis of a variety of pyridine, quinolizidine, and clavine alkaloids. The cyclization-deprotonation-cycloaddition cascade has been successfully applied to the synthesis of the naturally occurring alkaloids onychnine, dielsiquinone, (+/-)-lupinine, (+/-)-anagyrine