Efficient and convenient synthesis of 1,8-dioxodecahydroacridine derivatives using Cu-doped ZnO nanocrystalline powder as a catalyst under solvent-free conditions

One-pot cascade synthesis and in vitro evaluation of anti-inflammatory and antidiabetic activities of S-methylphenyl substituted acridine-1,8-diones

Various S-methylphenyl substituted acridine-1,8-dione series (4a-i) were synthesized through a one-pot cascade synthetic approach involving the reaction of 4-(methylthio)benzaldehyde and dimedone with a variety of amines as nitrogen source under reflux in ethanol. All the synthesized derivatives were characterized by using spectroscopic methods. In vitro evaluations of anti-inflammatory and antidiabetic efficacies of all the synthesized compounds were investigated. The anti-inflammatory results infer that the compounds 4c and 4d are showing excellent activity with an inhibition percentage of 80.58 ± 0.42, 81.72 ± 1.72 by membrane stabilization and 77.72 ± 0.76, 78.76 ± 0.81 by albumin denaturation methods, which is comparable with the standard diclofenac at a concentration of 100 μg/ml. Further, the antidiabetic assay revealed the moderate activity for the synthesized compounds at a concentration of 100 μg/ml with respect to their standard drug, acarbose.

Nano-ZnO catalyzed multicomponent one-pot synthesis of novel spiro(indoline-pyranodioxine) derivatives

A simple catalytic protocol for the synthesis of novel spiro[indoline-pyranodioxine] derivatives has been developed using ZnO nanoparticle as an efficient, green, and reusable catalyst. The derivatives are obtained in moderate to excellent yield by one-pot three-component reaction of an isatin, malononitrile/ethylcyanoacetate, and 2,2-dimethyl-1,3-dioxane-4,6-dione in absolute ethanol under conventional heating and microwave irradiation. The catalyst was recovered by filtration from the reaction mixture and reused during five consecutive runs without any apparent loss of activity for the same reaction. The mild reaction conditions and recyclability of the catalyst make it environmentally benign synthetic procedure.