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JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1
Volume -, Issue 15, Pages 2415-2428Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b000750l
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A range of methods for the synthesis of mono-, bis- and tris-2,4-disubstituted oxazoles were evaluated, which led ultimately to a concise synthesis of the three contiguous oxazole ring system 26 in the ulapualide family of 25-membered macrolides, e.g. 1, found in marine organisms. The tris-oxazole macrolide core 30 in ulapualide A (1) was also synthesised based on a macrolactamisation strategy from the two functionalised mono-oxazole precursors 28 and 29, followed by oxazoline 45 and oxazole ring formation, exploiting the methodologies established in the synthesis of linear bis- and tris-oxazoles in the formation of 18 and 26. The tris-oxazole 26 was converted into the corresponding phosphonium salt 5 in readiness for elaboration to ulapualide A (1).
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