Cacalolides from Senecio barba-johannis

• Published in: Magnetic resonance in chemistry Vol. 41; no. 5; pp. 386 - 390
• Main Authors: Burgueño-Tapia, Eleuterio, Joseph-Nathan, Pedro
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.05.2003
• Subjects: 13-acetoxy-14-oxocacalohastin; 13-acetoxycacalohastin; 13-hydroxy-14-oxocacalohastin; 13C NMR; 1H NMR; 2D NMR; NMR; Senecio barba-johannis; T_{2}^{}
• ISSN: 0749-1581; 1097-458X
• DOI: 10.1002/mrc.1179

From the roots of Senecio barba‐johannis DC, the two new cacalolides 13‐acetoxycacalohastin (2) and 13‐hydroxy‐14‐oxocacalohastin (3), together with the known cacalolide 13‐acetoxy‐14‐oxocacalohastin (4) were isolated. Their structures were determined on the basis of chemical and spectroscopic evidence. Complete 1H and 13C NMR chemical shift assignments of these compounds were achieved using one‐ and two‐dimensional NMR methods, including gHMQC and gHMBC experiments. Copyright © 2003 John Wiley & Sons, Ltd.