Novel sulfonated mesoporous organic–inorganic SBA@Pr-3AP-SO3H for the synthesis of phenyl-[1,2,4]-triazolidines

Novel SBA@Pr-3AP-SO3H is designed as a sulfonated mesoporous hybrid organic–inorganic catalyst, which is anchored to the pore walls of SBA-15. SBA@Pr-3AP-SO3H was fabricated through modification of SBA-15 with (3-chloropropyl)triethoxysilane to yield SBA-Pr-Cl, reacted with 2,4,6-triaminopyrimidine (3AP) to provide SBA-Pr-3AP, followed by the reaction with 1,4-,4-butane sultone (SO3H) to obtain SBA@Pr-3AP-SO3H as an efficient catalyst. It was used in the synthesis of various heterocyclic phenyl-[1,2,4]-triazolidines through the reaction of aldehydes, urazole, and dimedone.