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Synthetic route for symmetrical and asymmetrical 3,6-diarylazo-pyrazolo[1,5-a] pyrimidine derivatives 8a,b and 9a,b. Reagents and Conditions: (a) 2-arylazomalononitrile 2a,b: N2H4·H2O (2:1)/EtOH-pyridine/reflux 5 h; (b) 2-arylazomalononitrile 2a,b: 5-diaminopyrazoles 4a,b (1:1)/EtOH-pyridine/reflux 4–7 h or heated under MW at 140 °C 2 min or sonicated at room temperature 1 h.
