Inverse electron demand Diels-Alder reactions of 3,6-dichloro-[1,2,4,5]tetrazine

Abstract 3,6-Dichloro-[1,2,4,5]tetrazine has been found to act as an efficient azadiene equivalent in inverse electron demand [4+2] cyclisations with a range of alkenes and alkynes, allowing rapid access to a range of highly functionalised pyridazines.