Asymmetric Addition of Diethylzinc to Diphenylphosphinoyl‐Imines Catalyzed by Copper(II) Trifluoromethanesulfonate‐Chiral (2′‐Ethylamino‐[1,1′]binaphthalenyl‐2‐yl)‐thiophosphoramidic Acid O,O′‐Diaryl Ester Ligands

Abstract The chiral binaphthylthiophosphoramide L1 prepared from the reaction of O,O ‐diphenyl chlorothiophosphate with ( R )‐(+)‐ N ‐ethyl‐1,1′‐binaphthyl‐2,2′‐diamine was used as a catalytic chiral ligand in the copper( II ) trifluoromethanesulfonate‐promoted asymmetric addition of diethylzinc to diphenylphosphinoyl‐imines to give the corresponding adducts in 90–98 % ee and good yields under mild conditions.