Enantioseparation using alkoxyphenylcarbamates of cellulose and amylose as chiral stationary phase for high-performance liquid chromatography.
Cellulose and amylose phenylcarbamates having one or two alkoxy groups on a phenyl ring were synthesized, and their chiral recognition abilities as chiral stationary phases for HPLC were evaluated. Compared to the 4-methoxyphenylcarbamates of cellulose and amylose, which are known to show a poor chiral recognition, the 3-methoxyphenylcarbamates exhibited much higher chiral recognitions. For cellulose derivatives, as the bulkiness of the 3-alkoxy group increased, the chiral recognition ability increased. On the other hand, for the amylose derivatives, a clear relation between the chiral recognition and the bulkiness of the alkoxy group was not observed, and the 3-methoxy, ethoxy, and isopropoxyphenylcarbamates showed relatively high chiral recognitions. The introduction of two methoxy groups to the meta-positions decreased the chiral recognition ability. In order to discuss the relationship between the structure and chiral recognition ability of the alkoxyphenylcarbamates, their molecular models were constructed.
Yamamoto
Chiyo
C
Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, Japan.
Inagaki
Shinji
S
Okamoto
Yoshio
Y