An Ammonia-Triggered Stereocontrolled Conversion of a γ-Lactone to the Central Tetrahydropyran of Pederin, Psymberin, and Onnamides D-F
作者:William J. Buffham、Nigel A. Swain、Sarah L. Kostiuk、Théo P. Gonçalves、David C. Harrowven
DOI:10.1002/ejoc.201101543
日期:2012.2
The onnamides, pederin, and psymberin have each attracted attention because of their potent biological activity and interesting structural features. A short (eight steps) and efficient stereocontrolled route to the centraltetrahydropyran ring in these natural products has been developed from (S)-malic acid. The key sequence involves the conversion of a ?-lactone to a tetrahydropyran structure triggered