Scheme 1.
Synthesis of triazolo pyrazole derivatives. Reagents and conditions: (i) 2-(chloromethyl)oxirane, K2CO3, 120 °C, 4 h; (ii) triazole, K2CO3, EtOH, reflux, 2 h; (iii) 3% NaOH, 100 °C, 3 h.
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