Asmarines G and H and Barekol, Three New Compounds from the Marine Sponge Raspailia sp.

Amira Rudi, Hagit Shalom, Michael Schleyer, Yehuda Benayahu, Yoel Kashman

Research output: Contribution to journalArticlepeer-review

Abstract

Four asmarines, the known A and F and two new ones G and H, four diterpenes, the known chelodane, barekoxide, and zaatirin and a new one, barekol, and methyl 3-oxo-cholan-24-oate were isolated from the Kenyan sponge Raspailia sp. The structures of all these compounds were established on the basis of MS and NMR data, and the absolute configuration of barekol was determined from the CD measurements of its keto-derivative. The 15N chemical shifts of the N atoms of the heterocycles of the asmarines were measured from 15N HMBC experiments, and the influence of various structural features on the δN values studied.

Original languageEnglish
Pages (from-to)106-109
Number of pages4
JournalJournal of Natural Products
Volume67
Issue number1
DOIs
StatePublished - Jan 2004

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