Rhodium-catalyzed highly enantio- and diastereoselective cotrimerization of alkenes and dialkyl acetylenedicarboxylates leading to furylcyclopropanes.

A cationic rhodium(I)/Segphos or H(8)-BINAP complex catalyzes the unprecedented cotrimerization of commercially available monoenes and dialkyl acetylenedicarboxylates, leading to functionalized furylcyclopropanes with excellent enantioselectivity and perfect diastereoselectivity.