Fig. 2.
Synthetic route to compounds 5a-b. Reagents and conditions: a) thiosemicarbazide, EtOH, HCl, reflux, b) NH4Fe(SO4)2.12H2O, H2O, reflux; c) NaNO2, HCl, Cu, d) piperidin-4-ol, EtOH, reflux
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