Enantioselective synthesis of α-fluorinated β2-amino acids

A methodology for the enantioselective synthesis of a-fluorinated beta(2)-amino acids has been developed from readily available carboxylic acids 3. Conversion to the Evan's oxazolidinone followed by enantioselective-fluorination and alkylation gave 7 in high diastereomeric excess (> 95%). Subsequent removal of the oxazolidinone and amination at the Bn-protected hydroxyl center gave optically active alpha-fluorinated beta(2)-amino acids.