LAUSR

Abstract A series of non-annulated products: trifluoromethylpyrazolone-tethered trisubstituted methane derivatives were synthesized in high yields in acetonitrile solvent catalyzed by NH4OAc via one-pot, three-component reactions of 2-hydroxy-1,4-naphthoquinone, aromatic aldehydes and 1-aryl-3-trifluoromethyl-5-pyrazolone. Treatment of trifluoromethylpyrazolone-tethered trisubstituted methane derivatives with the dehydrating agent SOCl2/Pyridine in acetonitrile afforded the corresponding annulated fused polyheterocyclic products trifluoromethylated benzo[6,7]chromeno[2,3-c]pyrazole-5,10-dione derivatives. Furthermore, an efficient, straightforward protocol has been developed for the synthesis of trifluoromethylated benzo[6,7]chromeno[2,3-c]pyrazole-5,10-dione derivatives at medium yields via one-pot, two-step, three-component reactions. Meanwhile, the structures of typical products were further confirmed by XRD-analysis.