Enantioseparation, quantification, molecular docking and molecular dynamics study of five ß-adrenergic blockers on Lux-Cellulose-2 column.

Enantioseparation of five ß-adrenergic blockers was studied using two mobile phases on a cellulose tris(3-chloro-4-methylphenylcarbamate) (Lux-Cellulose-2) chiral column in normal phase mode. The first mobile phase composed of n-hexane: ethanol: diethylamine 60: 40: 0.1 by volume has successfully resolved the chromatographic peaks of three pairs of ß-adrenergic blockers namely, bisoprolol, carvedilol and atenolol. A mixture of n-hexane: ethanol: diethyl amine 75: 25: 0.1 by volume was used as the second mobile phase to separate the four pairs of enantiomers, metoprolol, carvedilol, nebivolol and atenolol with high resolution values. The mobile phases were pumped at a flow rate 1 mL/min with column temperature 25 °C using a UV detector at 230 nm. Molecular docking simulations of the five pairs of enantiomers was carried out in the cavities of the chiral stationary phase to gain a better understanding of the interaction between analyte enantiomers and chiral stationary phase and to better understand the mechanism of chiral recognition. According to the results, hydrogen bond interactions and π-π- interactions were the main types of interaction involved in the chiral recognition. Molecular dynamics simulation was performed to investigate the solvent effect on the interaction of the five pair of enantiomers in the chiral stationary phase cavity under dynamic conditions.

Synthesis and Anticonvulsant Activity of Substituted-1,3-diazaspiro[4.5]decan-4-ones.

A series of novel spiroimidazolidinone derivatives 6a-d and 8a-x were synthesized and biologically evaluated for their anticonvulsant activity in the maximal electroshock seizure (MES) assay and the subcutaneous pentylenetetrazole (scPTZ) screening test. Compound 8w was the most active derivative in the scPTZ screening test with an ED50 value by about 5- and 83.6-fold lower than those of phenobarbital and ethosuximide as reference drugs, respectively. Most of the tested compounds exhibited moderate to weak activity in the MES screen test, except for 8a which displayed 100% protection at 0.09 mmol/kg. Moreover, all the test compounds did not show any minimal motor impairment in the neurotoxicity test.

Synthesis and anti-candida potential of certain novel 1-[(3-Substituted-3-phenyl)propyl]-1H-imidazoles.

The synthesis and anti-Candida activity of 1-[(3-aroyloxy-3-phenyl)propyl]-1H-imidazoles 5a-f and 1-[(3-alkyl/aralkyl/phenyl-3-phenyl)propan-3-ol]-1H-imidazoles 5g-j are reported. The influence of the ester formation and different substitutions on the anti-Candida activity of the alcohol 4 was investigated. Among the newly developed bioactive chemical entities, compounds 5b and 5c displayed minimum inhibitory concentrations (MICs) against Candida albicans and Candida pseudotropicales comparable to that of tioconazole and more potent than miconazole.