Asymmetric Induction during the Aminolysis of 5(4<i>H</i>)-Oxazolones from<i>N</i>-Benzoyl Amino Acids; Almost Specific Formation of One Epimer in the Reaction of the Oxazolone from<i>N</i>-Benzoyl-DL-<i>t</i>-leucine with Methyl L-Prolinate
Asymmetric induction during the aminolysis of 5(4H)-oxazolonesfrom N-benzoyl amino acids was investigated using a series of amino acid esters as amine nucleophiles. The reaction of the oxazolone from N-benzoyl-DL-t-Meucine with methyl L-prolinate was found to produce the diastereomeric DL isomer, almost specifically, under appropriate conditions.