Abstract
Chlorophenylselenenylation methodology is shown to cause cyclization of naturally occurring β- and γ-hydroxyolefinic acids. The phenylseleno-substituted 1,4-epoxides (tetrahydrofurans) thus obtained are oxidized by m-chloroperbenzoic acid (m-CPBA). Reaction of phenylselenenyl chloride with methyl 12-hydroxyoctadec-cis-9-enoate (methyl ricinoleate) gave methyl 9,12-epoxy-10-phenylselenenyloctadecanoate in useful yields. A similar reaction of phenylselenenyl chloride with methyl 9-hydroxyoctadec-cis-12-enoate afforded a quantitative yield of methyl 9,12-epoxy-13-phenylselenenyloctadecanoate. Oxidation of selenium-containing 1,4-epoxy esters by m-chloroperbenzoic acid (1 equivalent) yielded the respective olefinic 1,4-epoxy esters, while 5 equivalent m-CPBA afforded the corresponding oxirane esters of epoxytetrahydrofurans in high yields. The structure of the individual reaction products have been established from analytical and spectral data and corroborated by a study of their mass spectra.
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Agarwal, R., Rauf, A., Khan, M. et al. Organoselenium-mediated cyclization of hydroxyolefinic fatty acids and m-CPBA oxidation of selenium-containing 1,4-epoxy acids. J Am Oil Chem Soc 67, 932–936 (1990). https://doi.org/10.1007/BF02541851
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DOI: https://doi.org/10.1007/BF02541851