New method swaps nitrogen atoms to reshape pyridine molecules

A team of chemists has developed a versatile strategy for rearranging the nitrogen atom in pyridine rings, enabling the direct interconversion of positional isomers. By sequentially inserting and then deleting a nitrogen atom, the method shifts pre-installed substituents to new locations while preserving their chemical nature. The protocol is effective across a broad range of substrates, including mono-, di- and multisubstituted pyridines, and functions in structurally intricate environments.

This breakthrough provides a reliable synthetic transformation that treats pyridine substitution patterns as mutable variables in retrosynthetic planning. The work, published in Nature, includes extensive mechanistic studies and computational modeling to support the proposed pathway. It promises to streamline the synthesis of biologically active pyridine derivatives that often exhibit distinct activities depending on substitution position.