A three-component Mannich-type condensation leading to phosphinic dipeptides—extended transition state analogue inhibitors of aminopeptidases
作者:Anna Dziełak、Małgorzata Pawełczak、Artur Mucha
DOI:10.1016/j.tetlet.2011.04.037
日期:2011.6
N-Protected α-aminoalkylphosphinic acids bearing a P–H function were found to be novel practical building blocks in three-component condensations with formaldehyde and secondary amines (amino acids). Such Mannich-type N-phosphonomethylation is a common approach for phosphorus acid derived substrates and leads to multifunctional (phosphonic/amino/carboxylic) compounds of diverse relevance. The utility
characterized. Solution studies on the coordination abilities of the ligands have shown that these compounds form various protonated mono- and bis-complexes, where copper(II) coordination is realized through the nitrogen atom(s) of the amino group(s), supported by oxygen(s) from the phosphinate unit(s). Potentiometric titrations and a full spectroscopic analysis clarified the species distribution profiles