(±)-Estrone is synthesised via Torgov's compound by an AB→ABC→ABCD route. The C-ring is constructed by a new Diels–Alder methodology and the D-ring by a novel cyclopentane annulation reaction from a cyclopropanol precursor.
N. M. Sunder, P. A. Patil and N. S. Narasimhan, J. Chem. Soc., Perkin Trans. 1, 1990, 1331 DOI: 10.1039/P19900001331
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