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Preparative enantioseparation of synephrine by conventional and pH-zone-refining counter-current chromatography A
- Zhang, Yang, Wang, Shanshan, Luo, Jianguang, Lin, Yaolan, Xu, Xiao, Han, Chao, Kong, Lingyi
- Journal of chromatography 2018 v.1575 pp. 122-127
- adrenergic agonists, alkalinity, amino alcohols, countercurrent chromatography, high performance liquid chromatography
- Synephrine, a chiral adrenergic agonist, exists as R- (more active) and S-enantiomers (less active) that are difficult to separate because of their alkalinity and high polarity. Herein, we show that although this enantioseparation can hardly be achieved by high-performance liquid chromatography, acceptable preparative separation can be realized using high-speed counter-current chromatography (HSCCC) and pH-zone-refining counter-current chromatography (CCC) under optimal conditions. Specifically, 23.0 mg of S-synephrine and 25.0 mg of R-synephrine were isolated from 60.0 mg of racemic synephrine by conventional HSCCC, while 70.0 mg of S-synephrine and 69.0 mg of R-synephrine were obtained from 200.0 mg of racemic synephrine by pH-zone-refining CCC. The pH-zone-refining CCC was identified as the most efficient enantioseparation technique for synephrine and can be applied for the preparative enantioseparation of other β-amino alcohols.