A convenient route to novel fluorinated 1,2,4,3-triazaphospholo[1,5-a]pyridines and pyrido[1,2-b][1,2,4,5]triazaphosphinines

Abstract

A simple synthetic approach to the construction of novel fluorinated 5-oxo(thioxo)-2-oxido(sulfido)-1, 2, 4, 3-triazaphospholo[1, 5-a]pyridines 2-14 and pyrido[1, 2-b][1, 2, 4, 5]triazaphosphinines 16, 19 and 22, was achieved. The method depends on the treatment of 1, 6-diamino-4-(4-fluorophenyl)-2-oxo-1, 2-dihydropyridine-3, 5-dicarbonitrile (1) with some different types of phosphorus reagents such as phosphorus acid, and their esters, phosphorus halides as well as phosphorus sulfides. Structures of all the synthesized products were established by elemental analysis and spectral tools.