Asymmetric Copper-Catalyzed Carbomagnesiation of Cyclopropenes.

The highly diastereo- and enantioselective formation of polysubstituted cyclopropanes was easily achieved through the asymmetric copper-catalyzed carbomagnesiation reaction of nonfunctionalized cyclopropene derivatives. The carbometalated species generated in situ readily undergo C-C and C-X bond-forming reactions with various electrophiles with complete retention of configuration.