Synthesis and kinetic studies of a low-molecular weight organocatalyst for phosphate hydrolysis in water
作者:Michael Merschky、Carsten Schmuck
DOI:10.1039/b914974k
日期:——
Kinetic studies of a low-molecular weight organocatalyst 1 are presented. Compound 1 contains two histidines and one cationic side chain attached to a central aromatic core. In aqueous solution 1 accelerates the hydrolysis of a prototypal phosphodiester with rate enhancements of up to two orders of magnitude. A detailed HPLC analysis of hydrolysis experiments in Bis-Tris-buffer showed that the buffer itself can act as a nucleophile at least with the cyclic phosphate 16. Compound 1 is also an efficient host for the binding of bis-(para-nitrophenyl)-phosphate 14 with extraordinary high affinity of Kass = 24 400 M−1 in buffered water.
本文介绍了低分子量有机催化剂1的动力学研究。化合物1含有两个组氨酸和一个带电侧链,连接在一个中心芳香核心上。在水溶液中,1能够加速典型磷酸二酯的水解反应,速率提升高达两个数量级。通过在双三(羟甲基)甲烷缓冲液中对水解实验进行详细的HPLC分析,显示缓冲液本身至少在环状磷酸酯16的情况下可以作为亲核试剂。此外,化合物1也是一种高效的主体能与双(对硝基苯基)磷酸酯14结合,在缓冲水溶液中表现出极高的亲和力,结合常数Kass = 24,400 M−1。