Abstract
Re-collections of the cyanobacterium Lyngbya sp. have yielded two more members of the lyngbyapeptin and lyngbyabellin families. The gross structures of 15-norlyngbyapeptin A (1) and lyngbyabellin D (3) were deduced through standard 2D NMR techniques, with the absolute configuration of both elucidated through degradation and comparison with commercially available and synthetic standards. Degradation to the alpha-amino acid and NOE correlations determined the absolute and relative configuration of the 4-amino-3-hydroxy-5-methylhexanoic acid unit in 3. Lyngbyabellin D (3) displayed an IC(50) value of 0.1 microM against the KB cell line.
Published Version
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