Scheme 1.
Synthesis of 5-(3-naphthalen-2-yl-5-aryl-4,5-dihydropyrazol-1-yl)-thiazolidine-2,4-diones. Reagents, conditions and yields: (a) EtOH, reflux 1 h, 78–83%; (b) KOH, EtOH, reflux 5 h, 68–79%; (b) CH2O, EtOH, r.t. 1 h, 69–85%.
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