To obtain an insight into the interactions of potential anticonvulsant drugs with their surrounding, two series of 5-methyl-5-aryl- and 5-ethyl-5-arylhydantoins were synthesized and their absorption spectra were recorded in the region from 200 to 400 nm in a set of selected solvents. The effects of solvent dipolarity/polarizability and solvent-solute hydrogen bonding interactions on the absorption maxima shifts were analyzed by means of the linear solvation energy relationship (LSER) concept of Kamlet and Taft. The ratio of the contributions of specific and nonspecific solvent-solute interactions were correlated with the corresponding ADME properties of the studied compounds. The correlation equations were combined with different physicochemical parameters to generate new equations, which demonstrate the reasonable relationships between solvent-solute interactions and the structure-activity parameters.
According to the World Health Organization, the majority of people with epilepsy who live in developing countries do not have access to high-quality treatment. Modern anticonvulsants are in high demand since the unwanted effects of those compounds already in use make therapy difficult. The synthesis of derivatives of 5,5-disubstituted-N3-[(2-aryl thiazolidine-4-one-3-yl)amino]hydantoins has been reported. The position N3 of the hydantoin nucleus was substituted with 4-thiazolidinone moiety containing aryl substituent at 2nd position with the goal of achieving the enhanced anticonvulsant effect. Compounds 5c, 5d, 5l, 5r showed significant activity among the evaluated compounds compared to control at dose of 45 mg/kg. The analysis of structural features revealed that the substitution of p-hydroxy phenyl and cinnamyl substituted at 2nd position of thiazolidinone ring in 5,5-diphenyl-2,4- imidazolidinedione and p-chloro phenyl, p-methoxy phenyl substituted at 2nd position of thiazolidinone ring in (5,5-dialkyl)/(5-alkyl-5-substitutedphenyl)-2,4-imidazolidinedione skeleton enhanced the anticonvulsant potentiality of the synthesized compounds.