Synthesis of a New Ligand for Metal Assembly to a Selective Receptor
摘要:
Diarylphosphinic acid 2, bearing two ethylenediamine groups, was designed with the aim of assembly to form a hydrophobic cavity upon binding to metals. The new ligand was prepared in optically active form from phenylalanine by an efficient sequence which required chromatography only for the P-C bond forming steps. Versatile intermediates in the synthesis are described. Complexes of this ligand with Zn2+ were shown to bind closely related aromatic guests bearing anionic tethered groups with 1000-fold discrimination.