Sterols with unusual nuclear unsaturation from three cultured marine dinoflagellates |
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| Authors: | WCMC Kokke William Fenical Carl Djerassi |
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| Institution: | 1. Institute of Marine Resources, Scripps Institution of Oceanography, La Jolla, CA 92093 U.S.A.;2. Department of Chemistry, Stanford University, Stanford, CA 94305, U.S.A. |
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| Abstract: | Several new 4α-methyl sterols with unusual unsaturation in the Δ8(14)-or Δ14-positions, 4α,24S-dimethyl-5α-cholest-8 (14)-en-3β-ol, 4α-methyl-24ξ-ethyl-5α-cholest-8(14)-en-3β-ol, 4α-methyl-24(Z)-ethylidene-5α-cholest-8(14)- en-3β-ol, 4α,23 (or 22),24ξ-trimethyl-5α-cholesta-8(14),22-dien-3β-ol, 4α,24S(or 23ξ)-dimethyl-5α-cholest-14-en-3β-ol and 14-dehydrodinosterol, have been isolated from extracts of the cultured marine dinoflagellates Amphidinium carterae, A. corpulentum and Glenodinium sp. 4α-Methyl-24ξ-ethyl-5α-cholestan-3β-ol was isolated from the steryl ester fraction of Glenodinium sp. The structures of these new sterols are based upon extensive 360 MHz 1H NMR and MS analyses. |
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| Keywords: | A corpulentum Dinophyceae marine sterols phytoplankton |
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