Wipf, P and Coish, PDG
(1999)
Total synthesis of (±)-nisamycin.
Journal of Organic Chemistry, 64 (14).
5053 - 5061.
ISSN 0022-3263
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Abstract
We have developed a highly convergent synthesis of the manumycin-type m- C7N-antibiotic nisamycin that is applicable to other members of this family of antibiotics. The synthesis features a three-step sequence to the epoxyquinol core that serves as a scaffold for the attachment of the polyene side chains. The eastern polyene side chain was constructed via a novel organozirconocene-mediated synthesis. Zirconocene methodology was also applied to the synthesis of the polyene side chains of asukamycin. The southern side chain of nisamycin was introduced via a Stille reaction that employed a vinyl bromo ketone, derived from an acid-sensitive bromo ketal. Pd-mediated coupling of the vinyl bromide with a stannyl TIPS ester gave TIPS-protected nisamycin that was readily converted to the natural product.
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