The highly stereoselective acid-catalysed cyclization of an epoxystannane, together with the stereoselective alkylation by cinnamyl bromide of the enolate derived by conjugate addition of the anion of allyl phenyl sulphide to 2-methylcyclopent-2-enone, are the key steps in a simple synthesis of an aromatic steroid.
D. N. Jones and M. R. Peel, J. Chem. Soc., Chem. Commun., 1986, 216 DOI: 10.1039/C39860000216
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