期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 68, 期 23, 页码 8767-8773出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo030191z
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资金
- NCI NIH HHS [CA 44848, CA 67775] Funding Source: Medline
Two new cyclic heptapeptides have been isolated from the culture broth of a marine fungus, Scytalidium sp., collected from the Bahamas. The planar structures of scytalidamides A (1) and B (2) were assigned on the basis of 1D and 2D NMR spectroscopic techniques, while the absolute configuration of the amino acid residues in both molecules was determined by application of the advanced Mar-fey's method. The absolute stereochemistry of the uncommon 3-methylproline moiety in scytalidamide B (2) was confirmed by isolation and CD measurements, as well as application of the advanced Marfey's method. Scytalidamides A (1) and B (2) showed moderate in vitro cytotoxicity toward HCT-116 human colon adenocarcinoma with IC50 values of 2.7 and 11.0 muM, respectively.
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