Synthesis and evaluation of N-(phenylacetyl)trifluoromethanesulfonamides as anticonvulsant agents

An Efficient Strategy for the Synthesis of 1-(Trifluoromethylsulfonamido)propan-2-yl Esters and the Evaluation of Their Cytotoxic Activity

An efficient method for the synthesis of 1-(trifluoromethylsulfonamido)propan-2-yl benzoates is described, the products of the reaction were characterized by heteronuclear single quantum coherence spectroscopy (HSQC), heteronuclear multiple bond correlation (HMBC) and NMR experiments. The overall process began with the activation of the oxazoline ring by triflic anhydride, followed by the opening of the five-membered ring in the 5-methyl-2-phenyl-4,5-dihydrooxazole system. The cytotoxic activity of the new trifluoromethyl sulfonamides was evaluated with six cancer cell lines and human gingival fibroblasts, posteriorly analyzing the influence on cytotoxicity exerted by the withdrawing and donor substituents at the para-position of the phenyl ring. Compounds 3b-e showed cytotoxic activity, with IC₅₀ values ranging from 17-17.44 µM for the cell lines tested, finding the highest effect for compound 3e.

Synthesis, characterization, and anti-amoebic activity of N-(pyrimidin-2-yl)benzenesulfonamide derivatives

A new series of N-(pyrimidin-2-yl)benzenesulfonamide derivatives, 3a-3i and 4a-4i, was synthesized from pyrimidin-2-amines, 2a-2i, with the aim to explore their effects on in vitro growth of Entamoeba histolytica. The chemical structures of the compounds were elucidated by elemental analysis, FT-IR, (1) H- and (13) C-NMR, and ESI mass-spectral data. In vitro anti-amoebic activity was evaluated against HM1 : IMSS strain of Entamoeba histolytica. The IC50 values were calculated by using the double dilution method. The results were compared with the IC50 value of the standard drug 'metronidazole'. The selected compounds were tested for their cytotoxic activities by cell-viability assay using H9C2 cardiac myoblasts cell line, and the results indicated that all the compounds displayed remarkable >80% viabilities to a concentration of 100 μg/ml.

Novel furanylarylene arylsulfonylindolesulfonamides: synthesis and their antibacterial evaluation

An array of furanylarylene arylsulfonylindolesulfonamides was synthesized through multi-step synthetic protocols involving bromination, stannylation, Stille cross coupling, reduction, arylsulfonylation, chlorosulfonylation, and condensation reactions. As a preliminary evaluation, these analogs were tested for antibacterial activity against a series of bacterial strains such as Bacillus subtilis, Enterococcus faecalis, Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, and Klebsiella pneumoniae using a two-fold serial dilution assay. Whereas analogs possessing unsubstitution, bromosubstitution, or methyl substitution on the benzene ring of benzenesulfonyl group were less active/inactive, the methoxy and chloro substituted counterparts were demonstrated to be comparatively more active. A few of them were found to exhibit better activity than the standard, streptomycin against selective organisms.

Synthesis and CNS depressant activity of some novel 3-[5-substituted 1,3,4-thiadiazole-2-yl]-2-styryl quinazoline-4(3H)-ones

A series of novel 3-[5-substituted phenyl-1,3,4-thiadiazole-2-yl]-2-styryl quinazoline-4(3H)-ones were synthesized and evaluated for anticonvulsant, sedative-hypnotic and CNS depressant activities. After i.p. injection to mice at doses of 30, 100, and 300mg/kg body weight 2-styrylquinazolin-4(3H)-one derivatives were examined in the maximal electroshock induced seizures (MES) and subcutaneous pentylenetetrazole (scPTZ) induced seizure models in mice. The neurotoxicity was assessed using the rotorod method. Out of eighteen compounds only 4a, 4d, 4e, 4j and 4k showed anticonvulsant activity in one or more test models. All except 4e and 4f exhibited significant sedative-hypnotic activity via actophotometer screen. CNS depressant activity screened with the help of the forced swim pool method resulted into some potent compounds. From the experimental observation it can be concluded that synthesized compounds exhibited relatively better sedative-hypnotic and CNS depressant activities.

Synthesis of some 3-(arylalkylthio)-4-alkyl/aryl-5-(4-aminophenyl)-4H-1,2,4-triazole derivatives and their anticonvulsant activity

A series of novel 3-[[(substituted phenyl)methyl]thio]-4-alkyl/aryl-5-(4-aminophenyl)-4H-1,2,4-triazoles 11-20 and several related Schiff's bases, 3-[[(substituted phenyl)-methyl]thio]-4-alkyl/aryl-5-[[[(substituted phenyl/5-nitro-2-furyl)methylene]amino]-phenyl]-4H-1,2,4-triazoles 21-31 were synthesized for evaluation of their biological properties. Structures of the synthesized compounds were confirmed by the use of their spectral data besides elemental analysis. All compounds were evaluated for their anticonvulsant activity by maximal electroshock (MES), subcutaneous pentylenetetrazole (scPTZ) and neurotoxicity (NT) screens. A number of triazole derivatives, exhibited protection after intraperitoneal administration at the dose of 100 and 300 mg/kg in one or both models employed. Compounds 12, 13 and 14 were subjected to oral MES screening in rats at 30 mg/kg and were observed to protect 50% of the animals employed in the experiment. Antimicrobial and antituberculosis activity of these compounds 11-31 were also screened. Some of the tested compounds showed marginal activity against M. tuberculosis H37 Rv.

Synthesis and anticonvulsant and neurotoxicity evaluation of N4-phthalimido phenyl (thio) semicarbazides

The phenyl (thio) semicarbazide derivatives of phthalimido pharmacophore were synthesized and evaluated for their anticonvulsant and neurotoxic properties. Initial anticonvulsant screening was performed using intraperitoneal (i.p.), maximal electroshock-induced seizure (MES), subcutaneous pentylenetetrazole (scPTZ) and subcutaneous strychnine (sc STY)-induced seizure threshold tests in mice. Compound 2c afforded protection in all the three screens. Compounds except 1d, 2a and 2d showed no neurotoxicity up to 300 mg/kg. Compounds 1a, 1b, 2c, 2d, 2g and 2i were found to show oral MES activity. The compounds exhibited CNS depression and behavioral despair side effects, lesser than the conventional antiepileptic drugs.

Anticonvulsant and neurotoxicity evaluation of some 6-chlorobenzothiazolyl-2-thiosemicarbazones

Ten 6-chlorobenzothiazolyl-2-thiosemicarbazones were synthesised and screened for anticonvulsant and neurotoxic properties. Most of the compounds showed anticonvulsant activity against both maximal electroshock seizure (MES) and subcutaneous pentylenetetrazole screens. Eight compounds have shown good protection in the rat p.o. MES test at 30 mg kg(-1). Compound 1 [4-(6-chlorobenzothiazol-2-yl)-1-(3-isatinimino)thiosemicarbazone] emerged as the most promising one with an ED(50) of 17.86 and 6.07 mg kg(-1) in mice i.p. and rat p.o., respectively. Compound 1 showed a weak ability to block the expression of fully kindled seizures.

Synthesis and anticonvulsant activity of 4-bromophenyl substituted aryl semicarbazones

A number of 4-bromophenyl semicarbazones were synthesised and evaluated for anticonvulsant and sedative -hypnotic activities. After intraperitoneal injection to mice, the semicarbazone derivatives were examined in the maximal electroshock seizure (MES), subcutaneous pentylenetetrazole (scPTZ), subcutaneous strychnine (scSTY) and neurotoxicity (NT) screens. All the compounds showed anticonvulsant activity in one or more test models. Compound 12 showed greatest activity, being active in all the screens with very low neurotoxicity and no sedative-hypnotic activity. All the compounds except 7 had lower neurotoxicity compared to phenytoin. Three compounds (6, 11 and 14) showed greater protection than sodium valproate. The essential structural features responsible for interaction with receptor site are established within a suggested pharmacophore.