5-(4H)-Oxazolones and Their Benzamides as Potential Bioactive Small Molecules.

The five membered heterocyclic oxazole group plays an important role in drug discovery. Oxazolones present a wide range of biological activities. In this article the synthesis of 4-substituted-2-phenyloxazol-5(4H)-ones from the appropriate substituted aldehydes via an Erlenmeyer-Plochl reaction is reported. Subsequently, the corresponding benzamides were produced via a nucleophilic attack of a secondary amine on the oxazolone ring applying microwave irradiation. The compounds are obtained in good yields up to 94% and their structures were confirmed using IR, 1H-NMR, 13C-NMR and LC/MS data. The in vitro anti-lipid peroxidation activity and inhibitory activity against lipoxygenase and trypsin induced proteolysis of the novel derivatives were studied. Inhibition of carrageenin-induced paw edema (CPE) and nociception was also determined for compounds 4a and 4c. Oxazolones 2a and 2c strongly inhibit lipid peroxidation, followed by oxazolones 2b and 2d with an average inhibition of 86.5%. The most potent lipoxygenase inhibitor was the bisbenzamide derivative 4c, with IC50 41 µΜ. The benzamides 3c, 4a-4e and 5c were strong inhibitors of proteolysis. The replacement of the thienyl moiety by a phenyl group does not favor the protection. Compound 4c inhibited nociception higher than 4a. The replacement of thienyl groups by phenyl ring led to reduced biological activity. Docking studies of the most potent LOX inhibitor highlight interactions through allosteric mechanism. All the potent derivatives present good oral bioavailability.

Considering autotaxin inhibitors in terms of 2D-QSAR and 3D-mapping- review and evaluation.

The potential role of Autotaxin (ATX) in physiological and pathological processes turned it in an attractive drug target for pharmacological therapeutic development. However, potent and selective non-lipid as well lipid inhibitors of ATX are currently not available as drugs. In this paper we tried to review all the known progress on ATX inhibition using two dimensional (2D)-Quantitative Structure Activity Relationship (QSAR) and three dimensional (3D) mapping techniques. Furthermore, we tried to compare and extract conclusions analyzing with 3D mapping techniques vastly diverse structures of non-lipid ATX inhibitors which have been reported in patents. McGowan's Volume (MgVol) molar volume and Molar Refractivity (MR) of substituents seems to govern the ATX inhibition. 3D-mapping results point to the role of steric properties (Volume and Polar Surface Area-PSA). Steric factors are obviously important. The role of hydrophilicity was also highlighted. Electronic parameters are not found to be present.