The vinylcoumaranone (V) formed when isoderritol isoflavone (I) reacts with dimethylsulphoxonium methylide (1 mol) is isomerised by pyridine to isorotenone (X): the new rotenoid synthesis has similarities to the biosynthetic route.
L. Crombie, P. W. Freeman and D. A. Whiting, J. Chem. Soc. D, 1970, 563a DOI: 10.1039/C2970000563A
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