Total Syntheses of the Phytotoxic Lactones Herbarumin I and II and a Synthesis-Based Solution of the Pinolidoxin Puzzle
作者:Alois Fürstner、Karin Radkowski、Conny Wirtz、Richard Goddard、Christian W. Lehmann、Richard Mynott
DOI:10.1021/ja020238i
日期:2002.6.1
approach to a family of potent herbicidal 10-membered lactones is described on the basis of ring-closingmetathesis (RCM) as the key step for the formation of the medium-sized ring. This includes the first total syntheses of herbarumin I (1) and II (2) as well as the synthesis of several possible macrolides of the pinolidoxin series. A comparison of their spectral and analytical data with those of
intramolecular transesterification with formation of a hydroxylated butanolide skeleton does not annihilate their microfilament disrupting capacity. This finding calls for a reinvestigation of the biological profile of other fungal metabolites that embody a similar motif. Microcarpalide (1) serving as the calibration point for this comparative study was prepared by total synthesis based on ring-closing metathesis
Stereoselective Total Synthesis and Absolute Configuration of the Natural Decanolides (−)-Microcarpalide and (+)-Lethaloxin. Identity of (+)-Lethaloxin and (+)-Pinolidoxin
作者:Jorge García-Fortanet、Juan Murga、Eva Falomir、Miguel Carda、J. Alberto Marco
DOI:10.1021/jo051353p
日期:2005.11.1
Convergent, stereoselective syntheses of the pharmacologically active, naturally occurring lactones (−)-microcarpalide and (+)-lethaloxin have been achieved from the commercially available, chiral reagents (R)-glycidol, (S,S)-tartaric acid, and d-ribose as the starting materials. These syntheses have further served to establish the hitherto unknown absoluteconfiguration of (+)-lethaloxin and to show