Synthesis and dimerisation of [1,2,4]triazolo[4,3-a]pyrimidinium-3-aminides
Abstract
A new method for the synthesis of [1,2,4]triazolo[4,3-a]pyridinium-3-aminides (1a and b) and an analogous [1,2,4]triazolo[4,3-a]pyrimidinium-3-aminide (1c) is described; an attempt to extend the procedure to the synthesis of related compounds (1d–g) resulted in dimerisation and rearrangement to yield the enamines (5a–d).