Abstract
Copper (I) complexes prepared in situ from copper(I)-triflate and 8 optically active pyridine ligands, mainly 2,2′-bipyridines and 2,2′:6′,2′-terpyridines were used as chiral catalysts for the enantioselective cyclopropanation of styrene by ethyl diazoacetate. ee up to 32% was obtained.
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