Generation of Dynamic Combinatorial Libraries Using Hydrazone-Functionalized Surface Mimetics

Dynamic combinatorial chemistry (DCC) represents an approach whereby traditional supramolecular scaffolds used for protein surface recognition might be exploited to achieve selective high affinity target recognition. Synthesis, in situ screening and amplification under selection pressure, allows the generation of ligands, that bear different moieties capable of making multivalent non-covalent interactions with target proteins. Generic tetracarboxyphenyl porphyrin scaffolds bearing four hydrazide moieties have been used to form dynamic combinatorial libraries (DCLs) using, aniline catalyzed, reversible hydrazone exchange reactions, in 10 % DMSO, 5 mM NH₄OAc, pH 6.75. High resolution mass spectrometry (HRMS) was used to monitor library composition and establish conditions under which equilibria were established.