Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... An approach to the strained B,C-bicyclic nucleus of a heterocyclic class of steroids is described. The approach relies on a sigmatropic shift for installation of the strained bridge. ... Synthesis of the bicyclic core was completed by directed stereoselective introduction of the bridging oxygen using ...
