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  • Title: Chondropsin D, a new 37-membered-ring macrolide lactam from the marine sponge Chondropsis species.
    Author: Rashid MA, Cantrell CL, Gustafson KR, Boyd MR.
    Journal: J Nat Prod; 2001 Oct; 64(10):1341-4. PubMed ID: 11678663.
    Abstract:
    Chondropsin D (2), a new 37-membered-ring macrolide lactam, was isolated as a minor constituent of an aqueous extract of the marine sponge Chondropsis sp. This sponge sample had previously been the source of chondropsins A (1) and B, two novel polyketide-derived macrolides with potent cytotoxic activity. The structure of 2 was initially deduced from analysis of spectral data. This assignment was supported by the observation that chondropsin A (1), which contains a 35-membered macrocyclic ring, could be converted to chondropsin D (2) by a base-catalyzed intramolecular transesterification reaction. Rearrangement of the methylated derivative of chondropsin A (3) to the corresponding methylated analogue of chondropsin D (4) confirmed the structure of 2.
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