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Issue 19, 1996
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Biosynthesis of ML-236C and the hypocholesterolemic agents compactin by Penicillium aurantiogriseum and lovastatin by Aspergillus terreus: determination of the origin of carbon, hydrogen and oxygen atoms by 13C NMR spectrometry and observation of unusual labelling of acetate-derived oxygens by 18O2

Abstract

Sodium [1-13C, 2-2H3]-, [2-13C, 2-2H3]- and [1-13C, 18O2]-acetate are incorporated in separate experiments into ML-236C 2 and the hypocholesterolemic agent compactin 3 by cultures of Penicillium aurantiogriseum, and the regiochemical distribution of 2H, 13C and 18O is determined by 13C NMR spectrometry. In addition, sodium [1-13C, 18O2]acetate and 18O2 are incorporated into lovastatin (mevinolin) 4 by cultures of Aspergillus terreus to re-examine the origin of oxygen atoms. The results show that the main-chain oxygen atoms of 2–4 originate from acetate, and the C-8 oxygen atom of 3 and 4 is derived from molecular oxygen. However, detailed mass spectral analysis shows that significant amounts of aerobic oxygen can be incorporated at sites normally labelled by acetate oxygen, presumably through generation of [18O]acetate by ω-oxidation of fats. On the basis of labelling results, a mechanism is proposed to account for the formation of the bicyclic ring system in these compounds.

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Article type: Paper
DOI: 10.1039/P19960002357
J. Chem. Soc., Perkin Trans. 1, 1996, 2357-2363

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    Biosynthesis of ML-236C and the hypocholesterolemic agents compactin by Penicillium aurantiogriseum and lovastatin by Aspergillus terreus: determination of the origin of carbon, hydrogen and oxygen atoms by 13C NMR spectrometry and observation of unusual labelling of acetate-derived oxygens by 18O2

    K. Wagschal, Y. Yoshizawa, D. J. Witter, Y. Liu and J. C. Vederas, J. Chem. Soc., Perkin Trans. 1, 1996, 2357
    DOI: 10.1039/P19960002357

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