Regioselective iminophosphorane-mediated annelation of a 1,3,4-thiadiazole ring into a 1,2,4-triazine ring: Preparation of novel mesoionic compounds derived from [1,3,4]thiadiazolo[2,3-c]- and [1,3,4]thiadiazolo[3,2-d][1,2,4]triazines. | Publicación