The generation of an electrophilic centre on the 11β-(2-hydroxyethyl) estradiol 3,17β-bis(benzyl ether)(2) leads in two steps to the corresponding 1,11β-ethano-estradiol in a 61% overall yield.
E. Napolitano, R. Fiaschi and R. Hanson, J. Chem. Soc., Chem. Commun., 1989, 1330 DOI: 10.1039/C39890001330
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