One‐pot regioselective synthesis of new imidazo[4,5‐e]thiazolo[3,2‐b][1,2,4]triazines by reaction of imidazotriazines with propargyl bromide

Abstract

AbstractA regioselective one‐pot method for the synthesis of imidazo[4,5‐e]thiazolo[3,2‐b][1,2,4]triazine derivatives has been developed by the reaction of imidazotriazinethiones with propargyl bromides upon treatment with potassium carbonate in methanol. The synthesis was accomplished by converting the imidazotriazinethiones into S‐propargyl derivatives followed by subsequent 5‐exo‐dig cyclization. The mechanism of the cyclization was studied using deuterium labels.