Gl. Rusinov et al., Synthesis of 2-substituted 6,8-dinitro[1,2,4]triazolo[1,5-a]pyridines and the formation of the related zwitterionic sigma-adducts, RUSS CHEM B, 48(7), 1999, pp. 1391-1393
A method for the synthesis of 2-substituted 6,8-dinitro[1,2,4]triazolo[1,5-
a]pyridines is proposed. The method includes the reaction of 2-chloro-3,5-d
initropyridine with the corresponding fi-substituted tetrazoles. The result
ing compounds react with anhydro bases of alpha- and gamma-methylazinium sa
lts to give zwitterionic sigma-adducts.