Toward the Asymmetric Synthesis of Cardenolides and Related Steroidal Systems: <i>syn</i>-S<sub>N</sub>2' of Organometallics with C14-C17 Vinylepoxides.
Adam B MillhamGlenn C MicalizioPublished in: Organic letters (2022)
In a program aimed at establishing a common sequence of C-C bond-forming reactions for asymmetric construction of tetracyclic triterpenoid natural products and related synthetic systems, effort has been directed toward introducing C17β-substitution by late-stage functionalization of stereodefined "steroidal" D-ring vinylepoxides (spanning C14-C17). It has been found that cyanocuprates participate in <i>syn</i>-S<sub>N</sub>2' reactions that result in products bearing various C17β-substituents and containing a β-OH at C14.