Amphiphilic Polymer Supports for the Asymmetric Hydrogenation of Amino Acid Precursors in Water
作者:M. Tobias Zarka、Oskar Nuyken、Ralf Weberskirch
DOI:10.1002/chem.200304729
日期:2003.7.21
Subsequently, these polymers were successfully utilized as a polymeric support for the asymmetric hydrogenation of 1) (Z)-alpha-acetamido cinnamic acid and 2) methyl (Z)-alpha-acetamido cinnamate in water, showing 90 % substrate conversion at 25 degrees C within 20 minutes at atmospheric H(2) pressure (1 bar) for methyl (Z)-alpha-acetamido cinnamate.
本文介绍了一种新型的基于两恶唑啉衍生物的两亲水溶性二嵌段共聚物的合成和表征,该共聚物在疏水嵌段中带有悬垂的(2S,4S)-4-二苯基膦基-2-(二苯基膦基甲基)吡咯烷(PPM)单元。合成策略包括制备在侧链具有酯官能度的二嵌段共聚物前体。在类似于聚合物的步骤中将其转化为羧酸,最后与PPM配体反应。通过(1)H和(31)P NMR光谱和GPC测量来表征共聚物的结构。随后,这些聚合物已成功地用作聚合物载体,用于在水中对1)(Z)-α-乙酰氨基肉桂酸和2)(Z)-α-乙酰氨基肉桂酸甲酯进行不对称氢化,