Natural biopolymers is an efficient catalyst for the synthesis of 1,3,5 – trisubstituted pyrazoles

Pyrazoles can be synthesized via condensation of 1,3 – diketones and hydrazines in the presence of inorganic support acidic catalyst such as silica supported sulfuric, and polystyrene sufuric acid. cellulose sulfuric acid (CSA) has emerged as a promising biopolymeric solid – support acid catalyst for acid – catalyzed reaction , such as the synthesis of a – amio nitriles, aryl – 14H-debanzo [a.j] xanthenes, 1,4 – dihydropyridines , pechmann condensation, thiadiazole benzimidazoles, imidazoazines , quinolines and 3,4 – dihydropyrimidine – 2(1H) – ones.

کلیدواژه ها:

sufuric acid ، Pyrazoles ، cellulose ، derivatives