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A cyclized didemnimide alkaloid from the caribbean ascidian didemnumconchyliatum
1Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California-San Diego, La Jolla, California 92093-0236, and Varian NMR Instruments, 3120 Hansen Way, Palo Alto, California 94304, USA.
Journal of Natural Products
|March 17, 1999
Abstract:
A novel, cyclized alkaloid of the didemnimide class, 5, has been isolated from extracts of the Caribbean ascidian Didemnum conchyliatum. The structure of 5 was assigned using combined spectral methods that emphasized one- and two-dimensional NMR methods. The new alkaloid is the cyclization product of didemnimide A (1) formed via a C-2 indole condensation with the imidazole nitrogen.