Reaction of amines with perfluoroazapropene: formation of the novel 4H-pyrido[1,2-a]-s-triazine system via unsymmetrical carbodi-imides
Abstract
Perfluoroazapropene (1) reacts with primary aromatic amines to give intermediate carbodi-imides (2) which dimerise or trimerise; intramolecular cyclisation occurs with 2-aminopyridines to give the novel hetero-cyclic system 4H-pyrido[1,2-a]-s-triazine and with aminopyrazine to give a derivative of 4H-pyrazino-[1,2-a]-s-triazine, respectively.