An efficient new synthesis has been elaborated for non-natural (−)-dactylolide ((−)-2) and its 13-desmethylene analogue 4, employing a HWE-based macrocyclization approach with β-keto-phosphonate/aldehyde 19 and the respective 13-desmethylene derivative as the key intermediates. Both (−)-2 and 4 as well as the corresponding C20 alcohols inhibit human cancer cell proliferation with IC50 values in the
Total Synthesis of Potent Antitumor Macrolide (-)-Zampanolide: An Oxidative Intramolecular Cyclization-Based Strategy
作者:Arun K. Ghosh、Xu Cheng、Ruoli Bai、Ernest Hamel
DOI:10.1002/ejoc.201200286
日期:2012.8
enantioselective totalsynthesis of (-)-zampanolide, a macrolide marine natural product with high anti-cancer activity is described. For synthesis of the 4-methylene tetrahydropyran unit of (-)-zampanolide, initially, we relied upon an oxidative C-H activation of an alkenyl ether and intramolecular cyclization to provide the substituted tetrahydropyran ring. However, this strategy was unsuccessful