A practical synthesis of long-chain iso-fatty acids (iso-C12–C19) and related natural products

Summary A gram-scale synthesis of terminally-branched iso-fatty acids (iso-C12–C19) was developed commencing with methyl undec-10-enoate (methyl undecylenate) (for iso-C12–C14) or the C15 and C16 lactones pentadecanolide (for iso-C15–C17) and hexadecanolide (for iso-C18–C19). Central to the approaches outlined is the two-step construction of the terminal isopropyl group through addition of methylmagnesium bromide to the ester/lactones and selective reduction of the resulting tertiary alcohols. Thus, the C12, C17 and C18 iso-fatty acids were obtained in three steps from commercially-available starting materials, and the remaining C13–C16 and C19 iso-fatty acids were prepared by homologation or recursive dehomologations of these fatty acids or through intercepting appropriate intermediates. Highlighting the synthetic potential of the iso-fatty acids and various intermediates prepared herein, we describe the synthesis of the natural products (S)-2,15-dimethylpalmitic acid, (S)-2-hydroxy-15-methylpalmitic acid, and 2-oxo-14-methylpentadecane.

• Publication year

  2013

• Venue

  Beilstein Journal of Organic Chemistry

• Publication date

  2013-09-04

• Fields of study

  Medicine, Chemistry

• Identifiers
  DOI 10.3762/bjoc.9.210PMID 24062846PMCID 3778388
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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