Fig. 9.
Reusability of the catalyst in the synthesis of 1,2,4-triazoloquinazolinones (6b, 7a, 8b), 1,2,4-triazolo[4,3-a]pyrimidines (10b), pyrido[4,5-b]quinolone (12b) and pyrido[2,3-d]pyrimidines (13b).
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