Regioselective Carbonylation of <i>trans</i>-Disubstituted Epoxides to β‑Lactones: A Viable Entry into <i>syn</i>-Aldol-Type Products

Abstract

Two new catalysts are reported for the regioselective carbonylation of <i>trans</i>-disubstituted epoxides to <i>cis</i>-β-lactones. The two catalysts display high and opposing selectivities, which generally are difficult to achieve for this class of epoxides. The resulting β-lactones are well-defined precursors for a wide variety of aldol-type compounds. Altogether, carbonylation of disubstituted epoxides is established as a viable and economical entry into <i>syn</i>- and <i>anti</i>-aldol products