Incubation of 17-norkauran-16-one (1b) and ent-17-norkauran-16-one (2b) with Rhizopus nigricans gave mixtures of mono-and di-hydroxy-derivatives [(8a–d) and (5a–d), respectively]. A modification of an earlier representation of the relevant enzymic sites is used to explain the patterns of hydroxylation observed.
R. McCrindle, J. K. Turnbull and A. B. Anderson, J. Chem. Soc., Perkin Trans. 1, 1975, 1202 DOI: 10.1039/P19750001202
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