Hapalosin, a Cyanobacterial Cyclic Depsipeptide with Multidrug-Resistance Reversing Activity

Klemens Stratmann, David L. Burgoyne, Richard E. Moore, Gregory M.L. Patterson, Charles D. Smith

Research output: Contribution to journalArticlepeer-review

148 Scopus citations


Hapalosin (2), a novel cyclic depsipeptide from the blue-green alga (cyanobacterium) Hapalosiphon welwitschii W. & G. S. West (Stigonemataceae), shows MDR-reversing activity. Its structure has been determined to be (3S,4S,8S,9S,12S)-9-benzyl-4-heptyl-8-hydroxy-12-isopropyl-3,10-dimethyl-1,5-dioxa-10-azacyclododecane-2,6,11 -trione by a combination of spectroscopic and chemical methods. The carbon skeleton of 2 was determined by two-dimensional 1H— and 1H—13C NMR correlation experiments and confirmed by mass spectral analysis. The relative and absolute stereochemistry was determined by coupling constant data and Mosher analysis of 2 and three degradation products obtained from acid hydrolysis of 2.

Original languageEnglish (US)
Pages (from-to)7219-7226
Number of pages8
JournalJournal of Organic Chemistry
Issue number24
StatePublished - Dec 1 1994

All Science Journal Classification (ASJC) codes

  • Organic Chemistry


Dive into the research topics of 'Hapalosin, a Cyanobacterial Cyclic Depsipeptide with Multidrug-Resistance Reversing Activity'. Together they form a unique fingerprint.

Cite this