Coibacins A and B: Total Synthesis and Stereochemical Revision

TitleCoibacins A and B: Total Synthesis and Stereochemical Revision
Publication TypeJournal Article
Year of Publication2014
AuthorsCarneiro V.MT, Avila C.M, Balunas M.J, Gerwick WH, Pilli R.A
JournalJournal of Organic Chemistry
Date Published2014/01
Type of ArticleArticle
ISBN Number0022-3263
Accession NumberWOS:000330099000016
Keywordsallylic alcohols; callyspongia-truncata; cyanobacterium lyngbya-majuscula; human cancer-cells; in-vitro evaluation; marine; natural-products; pd 113,270; polyketide; potent cytotoxic; Sponge; tumor agents ci-920

The interface between synthetic organic chemistry and natural products was explored in order to unravel the structure of coibacin A, a metabolite isolated from the marine cyanobacterium cf. Oscillatoria sp. that exhibits selective antileishmanial activity and potent anti-inflammatory properties. Our synthetic plan focused on a convergent strategy that allows rapid access to the desired target by coupling of three key fragments involving E-selective Wittig and modified Julia olefinations. CD measurements and comparative HPLC analyses of the natural product and four synthetic stereoisomers led to determination of its absolute configuration, thus correcting the original assignment at C-5 and unambiguously establishing those at C-16 and C-18. Additionally, we synthesized coibacin B on the basis of the assignment of configuration for coibacin A.

Short TitleJ. Org. Chem.
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