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A series of novel chiral ligands L1–L4 with an imidazoline–oxazoline framework have been developed as new type of non-symmetric N,N-bidentate ligands. All the chiral ligands were prepared from 2,2-diethylmalonic acid and enantiomerically pure (S)-2-amino-3-methyl-1-butanol in four steps with excellent optical purity. These newly developed ligands efficiently affect the copper-catalyzed enantioselective...
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