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A new series of biscoumarin derivatives 3a–n were synthesized and evaluated for their α-glucosidase inhibitory activities. The reaction of the 4-aminocoumarin with benzaldehyde derivatives led to the formation of the title compounds in good yields. All the synthesized compounds showed potent α-glucosidase inhibitory activity with IC50 ranging from 20.0 ± 0.7 to180.1 ± 0.8 µM, in comparison with acarbose as the standard drug (IC50 = 750.0 1.5 µM). Among the synthesized compounds, 3,3'-(p-tolylmethylene)bis(4-amino-2H-chromen-2-one) 3c was found to be the most active compound with an IC50 value of 20.0 ± 0.7 µM. Kinetic study exhibited that compound 3c was a competitive inhibitor against α-glucosidase (Ki = 22.4 µM). In silico docking study for the most potent compound 3c was also performed. [ABSTRACT FROM AUTHOR]

Benzoylquinazolinone derivatives 3a–n were synthesized via a simple one‐step reaction, and evaluated for in vitro α‐glucosidase inhibitory activity. Compounds 3d, 3f–g, 3i, and 3m–n showed more inhibitory activity than standard drug acarbose (IC50 = 750.0 ± 1.5 μM), and among them, compound 3d displayed the highest α‐glucosidase inhibitory activity (IC50 = 261.6 ± 0.1 μM). The kinetic analysis of the compound 3d revealed that this compound inhibited α‐glucosidase in a competitive manner (Ki = 255 μM). The docking studies were applied to predict binding modes of the synthesized compounds in active site of α‐glucosidase. [ABSTRACT FROM AUTHOR]

Phosphonic acid functionalized KIT-6 confined ionic liquid (IL, 1-butyl-3-methylimidazolium tetrafluoroborate [BMIm][BF4]) catalyzed the one-pot condensation reaction of iminochromenes and salicylaldehydes with different primary alcohols to achieve the corresponding 4-alkoxy-5H-chromen[2,3-d]pyrimidines under solvent-free conditions and in good yields. This efficient nanocatalyst can be recovered for at least five reaction runs without significant loss of either activity or confined IL. [ABSTRACT FROM AUTHOR]

Background and the Purpose of the Study: Modified androsterone derivatives are class of steroidal compounds with potential anticancer properties. Various steroidal derivatives containing substitution at position 16 have shown diversified pharmacological activities. In the present study, a new series of cytotoxic 16-(substituted benzylidene) derivatives of dehydroepiandrosterone (DHEA) were synthesized and evaluated against three different cancer cell lines., Methods: The cytotoxic 16-(substituted benzylidene) derivatives of DHEA were synthesized via aldol condensation of DHEA with corresponding benzaldehyde derivatives. The cytotoxic activity of synthesized derivatives was evaluated against three different cancer cells including KB, T47D and SK-N-MC cell lines by MTT reduction colorimetric assay., Results: The results indicated that 16-(substituted benzylidene) derivatives of DHEA could be served as a potent anti-cancer agent. The 3-cholro benzylidene derivatives of DHEA was the most potent synthesized derivative especially against KB and T47D cell lines (IC50 values were 0.6 and 1.7 μM; respectively)., Conclusion: The cytotoxic potential of novel benzylidene derivatives of DHEA is mainly attributed to the position and nature of the substituted group on the benzylidene pendant.

The aim of this study was to investigate the effect of black pepper fruit hot water extract (BPE) on rat ileum contractility and the mechanism(s) of its action. The extract was prepared by adding black pepper powder to boiling distilled water followed by evaporated the solvent. Ileum was dissected from male adult rat (Wistar) and in Tyrode solution the tissue contractions were recorded by an isotonic transducer under 1 g tension. The cumulative concentrations of the BPE (0.0625-1 mg mL(-1)) reduced the ileum contractions induced by KCl (60 mM) or carbachol (10 microM) concentration dependently (p<0.001). In Ca2+-free Tyrode solution with high potassium (60 mM), BPE, (0.0625-1 mg mL(-1)) attenuated the contractions induced by cumulative concentrations of CaCl2 (0.225-2.7 mM) concentration dependently (ANOVA, p<0.05). The incubation of the tissue preparation (20 or 30 min) with L-NAME (100 microM), naloxone (1 microM) or propranolol (1 microM) did not reduce the extract antispasmodic effect on KCl-induced ileum contraction. The extract spasmolytic effect was attenuated neither by glibenclamide (10 microM) nor by tetraethylammonium (1 mM). Present results suggest that the spasmolytic effect of the extract on rat ileum was possibly mediated via Ca2+ influx.