Mass spectral and 13C n.m.r. analyses of tajixanthone (1) and shamixanthone (2) formed during growth of Aspergillus variecolor under atmospheres containing [18O2] oxygen gas showed incorporation of four and three 18O labels per molecule of (1) and (2), respectively, and provided information about the mode of xanthone ring formation.
E. Bardshiri, C. R. McIntyre, T. J. Simpson, R. N. Moore, L. A. Trimble and J. C. Vederas, J. Chem. Soc., Chem. Commun., 1984, 1404 DOI: 10.1039/C39840001404
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