title: 1-Acylthiosemicarbazides, 1,2,4-triazole-5(4H)-thiones, 1,3,4-thiadiazoles and hydrazones containing 5-methyl-2-benzoxazolinones: synthesis, analgesic-anti-inflammatory and antimicrobial activities.
abstract: Acetic acid hydrazide containing 5-methyl-2-benzoxazolinone (4) was synthesized by the condensation of 2-(5-methyl-2-benzoxazolinone-3-yl)acetate with hydrazine hydrate. Thiosemicarbazide derivatives (5a-5d) were afforded by the reaction of corresponding compound 4 with substituted isothiocyanates. The cyclization of compounds 5a-5d in the presence of triethylamine resulted in the formation of compounds 6a-6d containing 1,2,4-triazole ring. On the other hand, the treatment of compounds 5a-5d with orthophosphoric acid caused the conversion of side chain of compounds 5a-5d into 1,3,4-thiadiazole ring: thus, compounds 7a-7c were obtained. The treatment of compound 4 with aromatic aldehydes resulted in the formation of arylidene hydrazides as cis-trans conformers (8a-8e). The structures of the compounds were elucidated by spectral and elemental analysis. While most compounds were exhibiting high activity in the analgesic-anti-inflammatory field, most of them were found to be inactive against bacteria and fungi.
authors.affiliation: Hacettepe University, Faculty of Pharmacy, Department of Pharmaceutical Chemistry, 06100 Sihhiye, Ankara, Turkey.
authors.forename: Umut
authors.initials: U
authors.lastname: Salgin-Gökşen
authors.forename: Nesrin
authors.initials: N
authors.lastname: Gökhan-Kelekçi
authors.forename: Ozgür
authors.initials: O
authors.lastname: Göktaş
authors.forename: Yavuz
authors.initials: Y
authors.lastname: Köysal
authors.forename: Ekrem
authors.initials: E
authors.lastname: Kiliç
authors.forename: Samil
authors.initials: S
authors.lastname: Işik
authors.forename: Göknur
authors.initials: G
authors.lastname: Aktay
authors.forename: Meral
authors.initials: M
authors.lastname: Ozalp
mesh_terms: D000700:Analgesics / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000818:Animals; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D000893:Anti-Inflammatory Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use; D001583:Benzoxazoles / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004487:Edema / Q000188:drug therapy / Q000473:pathology; D006614:Hindlimb / Q000187:drug effects; D006835:Hydrazones / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D008745:Methylation; D051379:Mice; D050296:Microbial Viability / Q000187:drug effects; D008958:Models, Molecular; D015394:Molecular Structure; D012663:Semicarbazides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use; D013329:Structure-Activity Relationship; D013830:Thiadiazoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use; D014230:Triazoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use
chemical_list: D000700:Analgesics; D000900:Anti-Bacterial Agents; D000893:Anti-Inflammatory Agents; D001583:Benzoxazoles; D006835:Hydrazones; D012663:Semicarbazides; D013830:Thiadiazoles; D014230:Triazoles; C058949:1,3,4-thiadiazole; C013595:mercaptotriazole; C017057:benzoxazolone; C005151:thiosemicarbazide