title: Synthesis of some novel thiourea derivatives obtained from 5-[(4-aminophenoxy)methyl]-4-alkyl/aryl-2,4-dihydro-3H-1,2,4-triazole-3-thiones and evaluation as antiviral/anti-HIV and anti-tuberculosis agents.
abstract: As a continuation of our previous efforts on N-alkyl/aryl-N'-[4-(4-alkyl/aryl-2,4-dihydro-3H-1,2,4-triazole-3-thione-5-yl)phenyl]thioureas 1-19 and N-alkyl/aryl-N'-[4-(3-aralkylthio-4-alkyl/aryl-4H-1,2,4-triazole-5-yl)phenyl]thioureas 20-22, a series of novel 5-[(4-aminophenoxy)methyl]-4-alkyl/aryl-2,4-dihydro-3H-1,2,4-triazole-3-thiones 23-26 and several related thioureas, N-alkyl/aryl-N'-{4-[(4-alkyl/aryl-5-thioxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)methoxy]phenyl}thioureas 27-42 were synthesized for evaluation of their antiviral potency. Structures of the synthesized compounds were confirmed by the use of (1)H NMR, (13)C NMR and HR-MS data. All compounds 1-42 were evaluated in vitro against HIV-1 (IIIB) and HIV-2 (ROD) strains in MT-4 cells, as well as other selected viruses such as HSV-1, HSV-2, Coxsackie virus B4, Sindbis virus and Varicella-zoster virus using HeLa, Vero, HEL and E6SM cell cultures, and anti-tuberculosis activity against Mycobacterium tuberculosis H37Rv. Compounds 4 and 5 showed weak activity against HSV-1, HSV-2 and TK(-) HSV, whereas eight compounds showed marginal activity against Coxsackie virus B4. The most active derivative in this series was compound 38 which showed moderate protection against Coxsackie virus B4 with an MIC value of 16 microg/ml and a selectivity index of 5. This compound was also active against thymidine kinase positive Varicella-zoster virus (TK(+) VZV, OKA strain) with an EC(50) value of 9.9 microg/ml. Compound 38 was the most active compound with 79% inhibition against M. tuberculosis H37Rv.
authors.affiliation: Marmara University, Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Tibbiye cad. No. 49, Haydarpaşa 34668 Istanbul, Turkey. ikucukguzel@marmara.edu.tr
authors.forename: Ilkay
authors.initials: I
authors.lastname: Küçükgüzel
authors.forename: Esra
authors.initials: E
authors.lastname: Tatar
authors.forename: S Güniz
authors.initials: SG
authors.lastname: Küçükgüzel
authors.forename: Sevim
authors.initials: S
authors.lastname: Rollas
authors.forename: Erik
authors.initials: E
authors.lastname: De Clercq
mesh_terms: D000818:Animals; D000995:Antitubercular Agents / Q000138:chemical synthesis* / Q000494:pharmacology*; D000998:Antiviral Agents / Q000138:chemical synthesis* / Q000494:pharmacology*; D002460:Cell Line; D004353:Drug Evaluation, Preclinical; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008826:Microbial Sensitivity Tests; D013890:Thiourea / Q000737:chemistry*; D014230:Triazoles / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000995:Antitubercular Agents; D000998:Antiviral Agents; D014230:Triazoles; D013890:Thiourea