名称:
Direct C H/C Li coupling of 1,2,4-triazines with C6F5Li followed by aza-Diels-Alder reaction as a pot, atom, and step economy (PASE) approach towards novel fluorinated 2,2′-bipyridine fluorophores
摘要:
An original pot, atom, and step economy (PASE) approach towards novel pentafluorophenyl-substltuted 2,2'-bipyridine fluorophores, as well as their triazine precursors via oxidative transition metal-free C-H/C-Li coupling reactions between 1,2,4-triazines and pentafluorophenyl lithium followed by aza-Diels-Alder reaction has first been reported. This reaction sequence has been found to afford a number of novel pentafiuorophenyl-modified heterocyclic ensembles of various architectures, such as perfluorophenyl-substituted 1,2,4-triazines, their dihydro derivatives, as well as 2,2'-bipyridines in good to excellent yields. The photophysical properties of the synthesized bipyridine fluorophores have been studied, and non-linear optics behavior of the most representative fluorophore has been disclosed on the basis of a positive solvatochromism effect observed. The novel fluorinated 2,2'-bipyridines synthesized are of particular interest in the design of advanced materials for molecular electronics and medicinal chemistry.