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A Practical Synthesis of Long-Chain Iso-Fatty Acids (iso-C12-C19) and Related Natural Products

A Practical Synthesis of Long-Chain Iso-Fatty Acids (iso-C12-C19) and Related Natural Products

Mark B Richardson, Spencer J Williams

Beilstein J Org Chem. 2013 Sep 4;9:1807-12.

PMID: 24062846

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP106025	Pentadecanolide		106-02-5	Price

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