The synthesis of new chiral auxiliaries (S)-N-(2-benzoylphenyl)-1-(3,4-dichlorobenzyl)pyrrolidine-2-carboxamide (1a), (,S)-N-(2-benzoylphenyl)-1-(pentafluorobenzyl)pyrrolidine2-carboxamide (1b), and (S)-N-(2-benzoylphenyl)-1-(4-isopropoxytetrafluorobenzyl)pyrrolidine-2-carboxamide (1c) and their application in the asymmetric synthesis of amino acids using Ni-II complexes of their Schiff's bases with alanine and glycine are described. Compound la is particularly appropriate for highly stereoselective synthesis of a-methyl-a-amino acids with high enatiomeric purity (ee >95%).
The synthesis of new chiral auxiliaries (S)-N-(2-benzoylphenyl)-1-(3,4-dichlorobenzyl)pyrrolidine-2-carboxamide (1a), (,S)-N-(2-benzoylphenyl)-1-(pentafluorobenzyl)pyrrolidine2-carboxamide (1b), and (S)-N-(2-benzoylphenyl)-1-(4-isopropoxytetrafluorobenzyl)pyrrolidine-2-carboxamide (1c) and their application in the asymmetric synthesis of amino acids using Ni-II complexes of their Schiff's bases with alanine and glycine are described. Compound la is particularly appropriate for highly stereoselective synthesis of a-methyl-a-amino acids with high enatiomeric purity (ee >95%).