The seven-membered B- and C-rings of tropone 19, a molecule which embodies the framework of the alkaloid colchicine 1, have both been constructed via cyclopropanemediated expansion of a six-membered ring precursor.
M. G. Banwell, M. Berak and D. C. R. Hockless, J. Chem. Soc., Perkin Trans. 1, 1996, 2217 DOI: 10.1039/P19960002217
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