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Maria Letizia Ciavatta M. Pilar Lopez-Gresa Rosario Nicoletti Ernesto Mollo Guido Cimino 《Tetrahedron》2008,64(22):5365-5369
Chemical investigation of the culture broth of the fungus Eutypella scoparia ICB-OBX, isolated from the marine pulmonate mollusc Onchidium sp., led to the finding of novel compounds 1 and 2, structurally related to angiotensin II binding inhibitors cytosporins, along with unrelated known nitrogen metabolites (compounds 3-5). The structure and the relative stereochemistry of the novel metabolites were assigned mainly by a detailed analysis of two-dimensional NMR techniques whereas the absolute stereochemistry was proposed by modified Mosher's method. Compound 2 contains an unusual cyclic carbonate functionality that is rare among natural products. 相似文献
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Marianna Carbone Carlo A. Mattia Francesco Castelluccio Ernesto Mollo Guido Cimino 《Tetrahedron》2009,65(22):4404-2405
The chemical investigation of the marine pulmonate Onchidium sp. and of its defensive mucous secretion led us to the isolation of a novel polypropionate, onchidione (4), containing two γ-pyrone rings. The structure of 4 was elucidated by spectroscopic methods, mainly NMR techniques, and secured by X-ray analysis on a single crystal. 相似文献
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