15986-31-9Relevant articles and documents
Synthesis and biological evaluation of new imidazole, pyrimidine, and purine derivatives and analogs as inhibitors of xanthine oxidase
Biagi, Giuliana,Costantini, Alberto,Costantino, Luca,Giorgi, Irene,Livi, Oreste,Pecorari, Piergiorgio,Rinaldi, Marcella,Scartoni, Valerio
, p. 2529 - 2535 (2007/10/03)
Several derivatives of 4,5-disubstituted imidazole, 2,4,5-trisubstituted pyrimidine, 2-substituted purine, thiazolo[3,2-a]purine, [1,3]thiazino[3,2- a]purine, thiazolo[2,3-i]purine, [1,3]thiazino-[2,3-i]purine, and 6- substituted pyrazolo[3,4-d]pyrimidine were synthesized and tested as inhibitors of the xanthine oxidase enzyme. Of those, some 4-(acylamino)-5- carbamoylimidazoles and 2-thioalkyl-substituted purines exhibited very good inhibitory activity, being at least 500 times more effective than allopurinol. The ineffectiveness of 6-n-alkylpyrazolo[3,4-d]pyrimidines is imputable to the alkyl chain which could hinder the coordination with molybdenum according to the known mechanism for the binding of the inhibitor allopurinol; the effectiveness of imidazole derivatives, by contrast with the ineffectiveness of 4,5-diamino-2-(thioalkyl)-6-hydroxypyrimidines, indicates the relative importance of the five-membered ring in the interaction with the enzyme. Moreover, the marked effectiveness of the angularly-cyclized [1,3]thiazino[2,3-i]purinones, which constitute an interesting new class of inhibitors, together with the weak activity of linearly-cyclized derivatives, allowed us to characterize more precisely the lipophilic region of the enzyme facing the N(1)-C(2) positions of the substrate hypoxanthine.
