The synthesis of two versatile building blocks for supramolecular anion binding motifs, 5-(N-Boc-guanidinocarbonyl)-1H-pyrrole-2-carboxylicacid (1) and 5-(N-Cbz-guanidinocarbonyl)-1H-pyrrole-2-carboxylicacid (2) is reported. Using these building blocks, a guanidiniocarbonyl-pyrrole anion binding site can easily be introduced into more complex molecules by using standard amide coupling conditions
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.