Scheme 2.
Synthesis of 3-aminochromeno[4,3-c]pyrazol-4(1H)one (8). Reagents and conditions. (a) POCl3, DMF, CHCl3; (b) NH2OH. HCl, AcONa, EtOH; (c) POCl3; (d) N2H4. H2O, EtOH, 80% yield.
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