Synthesis of tetrazine-tetracyanobutadienes and their transformation into pyridazines via inverse-electron demand Diels–Alder cycloaddition (IEDDA)

Abstract

We report the synthesis of novel triphenylamine-tetrazine-tetracyanobutadiene based asymmetric and symmetric push-pull chromophores (1T and 1DT) by [2+2] cycloaddition-retroelectrocyclization of tetrazine connected electron-rich ethynyl triphenylamine with tetracyanoethene (TCNE). The electron-deficient...