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Synthesis of novel tri- and tetrasubstituted C18 furan fatty esters

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Lipids

Abstract

A methylene-interrupted C18 keto-acetylenic fatty ester (methyl 12-oxo-9-octadecynoate) was obtained from methyl ricinoleate by bromination-dehydrobromination followed by oxidation. Reaction of methyl 12-oxo-9-octadecynoate with bis(benzonitrile) palladium(II) chloride, allyl bromide, or methyl-allyl bromide furnished methyl 8-[5-hexyl-3-allyl-furan-2-yl]-octanoate (1, 56%) or methyl 8-[5-hexyl-3-(2-methyl-allyl)-furan-2-yl]-octanoate (2, 55%). Reaction of methyl 12-oxo-11-chloro-or 11-fluoro-9-octadeyynoate (prepared from methyl santalbate-methyl 11-E-9-octadecynoate, found in sandalwood, Santalum album, seed oil) with bis(benzonitrile) palladium(II) chloride gave methyl 8-(4-fluoro-5-hexyl-furan-2-yl)-octanoate (3, 50%) or methyl 8-(4-fluoro-5-hexyl-furan-2-yl)-octanoate (4, 50%), respectively. And when methyl 12-oxo-11-chloro- or 11-fluoro-9-octadecynoate was treated with a mixture of bis(benzonitrile) palladium(II) chloride, allyl bromide, or methyl-allyl bromide, the reaction yielded tetrasubstituted C18 furan derivatives, viz, methyl 8-(3-allyl-4-chloro-5-hexyl-furan-2-yl)-octanoate (5, 54%), methyl 8-[4-chloro-5-hexyl-3-(2-methyl-allyl)-furan-2-yl)-octanoate (6, 54%), methyl 8-(3-allyl-4-fluoro-5-hexyl-furan-2-yl]-octanoate (7, 10%), and methyl 8-[4-fluoro-5-hexyl-3-(2-methyl-allyl)-furan-2-yl]-octanoate (8, 10%). The presence of a fluorine atom in the furan derivatives 4, 7, and 8 was readily characterized by the appearance of doublets for carbon nuclei, which were coupled to the fluorine atom in the 13C NMR spectra. All furan fatty derivatives from this work were characterized by NMR spectroscopic and mass spectrometric analyses. The yields of compounds 7 and 8 were very low (10%) despite attempts to improve the procedure by increasing the amounts of the reactants and catalyst.

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Abbreviations

HMBC:

heteronuclear multiple bond correlation

r.t.:

room temperature

TMS:

tetramethylsilane

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Authors and Affiliations

  1. Department of Chemistry, The University of Hong Kong, Pokfulam Rd., Hong Kong, SAR, China

    Marcel S. F. Lie Ken Jie, Maureen M. L. Lau & Corey N. W. Lam

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  1. Marcel S. F. Lie Ken Jie
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  2. Maureen M. L. Lau
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  3. Corey N. W. Lam
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Correspondence to Marcel S. F. Lie Ken Jie.

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Lie Ken Jie, M.S.F., Lau, M.M.L. & Lam, C.N.W. Synthesis of novel tri- and tetrasubstituted C18 furan fatty esters. Lipids 38, 1293–1297 (2003). https://doi.org/10.1007/s11745-003-1192-8

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  • DOI: https://doi.org/10.1007/s11745-003-1192-8

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