Imprinted Polymers as Protecting Groups for Regioselective Modification of Polyfunctional Substrates
作者:Cameron Alexander、Craig R. Smith、Michael J. Whitcombe、Evgeny N. Vulfson
DOI:10.1021/ja982238h
日期:1999.7.1
selective solvent extractions, and chemical modification experiments. The feasibility of using imprinted polymers as reusable protecting groups was established by the regioselective acylation of trihydroxysteroids bound to polymers imprinted with structurally related diols. In polymers prepared with tert-butyl ester templates “matched” to the substrate, regioselectivities as high as 23.1:1 (24-acetate:3-acetate)
印迹聚合物是使用衍生自硼苯酞的功能单体和许多带有空间分离羟基的类固醇模板制备的。结合相互作用的协同性质在印有雄激素-5-烯-3β,17β-二醇及其结构类似物的聚合物中得到证实。使用红外光谱、选择性溶剂萃取和化学改性实验来探测结合的化学计量和动力学。使用印迹聚合物作为可重复使用的保护基团的可行性是通过与印有结构相关二醇的聚合物结合的三羟基类固醇的区域选择性酰化来确定的。在用与底物“匹配”的叔丁酯模板制备的聚合物中,区域选择性高达 23.1:1(24-乙酸酯:观察到单酯产物(回收材料的 65%)中的 3-乙酸酯)。在“不匹配”的情况下,比例下降到 5.4:1;然而,在功能相同的控制聚合物中,印有乙二醇,区域...