Carbonylation of cis-Disubstituted Epoxides to trans-β-Lactones: Catalysts Displaying Steric and Contrasteric Regioselectivity
摘要:
trans-beta-Lactones are a versatile and useful class of compounds, but reliable methods for their direct synthesis are still limited. Addressing this problem, we present herein two catalysts for the regioselective carbonylation of cis-disubstituted epoxides. The two catalysts show high activities and opposing regioselectivities so that either one of the two possible beta-lactone regioisomers can be obtained selectively.