Porous size monodisperse methacrylate beads containing amino and hydroxyl groups, which can be used as a platform for the production of chiral separation media, have been prepared using the staged templated suspension polymerization process. The monomers 2-hydroxyethyl methacrylate and several tert-butoxycarbonyl-protected aminoalkyl methacrylates were used for the preparation of both hydroxyl- and amino-functionalized beads. Attachment of a chiral selector based on l-valine-3,5-dimethylanilide through a carbamate and a urea linkage, respectively, provides chiral stationary phases with excellent enantioselectivities in the separation of the enantiomers of 3,5-dinitrobenzamido derivatives of α-amino acids. For comparison purposes, a separation medium was also prepared by the direct polymerization of a chiral monomer analogous to the hydroxyethyl methacrylate-based stationary phase. The chiral stationary phases prepared with the N-methyl-2-aminoethyl methacrylate platform exhibit the best selectivity, and separation factors as high as 15 were achieved under normal-phase HPLC conditions.
采用分阶段模板悬浮聚合工艺制备了含有
氨基和羟基的多孔尺寸单分散
甲基丙烯酸酯珠,可用作生产手性分离介质的平台。单体
甲基丙烯酸2-羟
乙酯和几种叔丁氧基羰基保护的
甲基丙烯酸氨基烷基酯用于制备羟基和
氨基官能化的珠子。分别通过
氨基甲酸酯和
脲键连接基于
L-缬氨酸-
3,5-二甲基苯胺的手性选择剂,为分离 α-
氨基 3,5-
二硝基苯甲酰
氨基衍
生物的对映体提供了具有优异对映选择性的手性固定相酸。为了比较的目的,还通过类似于基于
甲基丙烯酸羟乙酯的固定相的手性单体的直接聚合来制备分离介质。采用
甲基丙烯酸N-甲基-2-
氨基
乙酯平台制备的手性固定相表现出最佳的选择性,在正相HPLC条件下分离因子高达15。