M. Falorni et al., GENERAL AND VERSATILE APPROACH TO THE SYNTHESIS OF OPTICALLY-ACTIVE 5-ALKYLPIPERAZINE-2-CARBOXYLIC ACIDS, Synthesis, (4), 1994, pp. 391-395
General and convenient syntheses of optically active 5-alkylpiperazine
-2-carboxylic acids are described. The methods are based on cyclizatio
n of L- or D-serine with alpha-amino acids and occur without loss of o
ptical purity. The presented procedures are based on readily available
starting materials and can be arranged for multigram quantities.