Rotenone (2), but neither of the 6′-epimers of amorphigenol (3), is an excellent precursor for amorphigenin (1) in Amorpha fruticosa; using [7′-14C]rotenone and three different work-up techniques, the 14C-label was found to be equivalently distributed between the 7′-methylene and 8′-hydroxymethylene of amorphigenin.
L. Crombie, I. Holden, G. W. Kilbee and D. A. Whiting, J. Chem. Soc., Chem. Commun., 1979, 1144 DOI: 10.1039/C39790001144
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