Synthesis of Oligopyridinic Scaffolds from Amido Substituted Phenyl Rings for Extended Hydrogen Bonding

Abstract

A series of phenanthroline, terpyridine and pyridino-oxazoline ligands combining a 4-methyl-3,5-diacylaminophenyl platform and two dialkoxyphenyl groups has been prepared by a linear multistep protocol. The synthetic potential of 4-methyl-3,5-(diacyl­aminodialkoxyphenyl)benzoic acids was assessed by the construction, in a single step, of the chelating fragments. The grafting of these nitrogen-based groups is realized by the use of EDC·HCl and DMAP reagents under mild conditions. The synthetic methods reported herein provide a practical approach to the rational design of ligands bearing various kinds of functionalities such as the ester and amido linkages as well as the paraffin chains. A significant merit of this method is that it allows the introduction of the 4-methyl-3,5-diacylaminophenyl platform onto the oligopyridinic framework at the end of the synthetic protocol.

Keywords

phenanthroline - terpyridine - pyridino-oxazoline - amides - hydrogen bonds

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