‘Bis(oxazolines)’ as Ligands for Self‐Assembling Chiral Coordination Polymers— Structure of a Copper(I) Catalyst for the Enantioselective Cyclopropanation of Olefins

An efficient CuI catalyst for the highly enantioselective cyclopropanation (>98% ee) of styrene with diazoacetic acid esters is obtained from the reaction of copper(I) trifluoromethanesulfonate with bis(dihydrooxazolyl)propane (1). The CuOTf-1 complex is a helical coordination polymer air-stable in the solid state, whose structure is not retained in solution.