Unusual C25 Steroids Produced by a Sponge-Derived Penicillium citrinum

著者: Taro Amagata, Akiko Amagata, Karen Tenney, Frederick A. Valeriote, Emil B. Lobkovsky, Jon Clardy, Phillip Crews - Organic Letters 2003 被引用: 106

[structure: see text] Structurally unique steroids, isocyclocitrinol A (1) and 22-acetylisocyclocitrinol A (2), were isolated from the extract of a saltwater culture of sponge-derived Penicilliun citrinum. The structures were established by analysis of 1D and 2D NMR data. The absolute structures were determined on the basis of X-ray structure analysis and application of modified Mosher's method. Furthermore, the structure of cyclocitrinol (3a) previously isolated from a terrestrial P. citrinum was revised as 3b. Compounds 1 and 2 showed weak antibacterial activity against Staphylococcus epidermidis and Enterococcus durans.