Mechanistic evaluation of the resolution of α-amino acids on dynamic chiral stationary phases derived from amino alcohols by ligand-exchange chromatography

• Published in: Journal of Chromatography A Vol. 684; no. 2; pp. 189 - 200
• Main Authors: Hyun, Myung Ho, Yang, Duk Ho, Kim, Hyeon Ju, Ryoo, Jae-Jeong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 04.11.1994
• ISSN: 0021-9673
• DOI: 10.1016/0021-9673(94)00595-8

Two dynamic chiral stationary phases CSP 7 and 12) were prepared starting from R-2-amino-1-propanol and ( R)-α-phenylethylamine. The resolution of racemic α-amino acids on the two dynamic CSPs thus prepared were compared with previously reported resolution data on a dynamic CSP ( 2) derived from (1 S,2 R)-norephedrine. The enantioselectivity for the two enantiomers of α-amino acids on CSP 7 was found to be comparable to or better than that on CSP 2 while the enantioselectivity for the two enantiomers of α-amino acids on CSP 12 was much worse than that on CSPs 2 or 7. From these results, we concluded that the phenyl functionality at the first chiral center of CSP 2 is not essential in the chiral recognition. However, the hydroxy functionality of CSPs 2 or 7 does play a very important role in the chiral recognition.