Ring A and B keto-norsteroids have been obtained by applying the McMurray low valency titanium cyclization to steroidal seco ring A and ring B nor-keto-esters which were readily available by cleaving the corresponding unsaturated ketones.
J. R. Hanson and C. Uyanik, J. Chem. Res. (S), 1998, 221 DOI: 10.1039/A704747I
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