complex represents a conceptuallynew type of supramolecular organometallic catalyst, possessing a chiral reaction cavity. A clear relationship between catalyst structures and the stereoselectivity outcome in the catalytic cyclopropanations has been established and it is demonstrated that both the enantioselectivity and the diastereoselectivity can be independently modified by variation of the ligand structural
Supramolecular Cu(I) catalyst 1 exhibited 77% cumulative (dia- and enantio-) stereoselectivity and one of the highest diastereoselectivities (86% de) obtained to date in the cyclopropanation of styrene with ethyl diazoacetate.