title: Synthesis, anti-inflammatory, analgesic and antioxidant activities of some tetrasubstituted thiophenes.
abstract: Sets of tetrasubstituted thiophene esters 4a-4g, 5a-5f and 6a-6e were synthesized by reaction of 1-(alpha-Carbomethoxy-beta-aminothiocrotonoyl)-aryl/aroyl amines (3) with 3-(bromoacetyl)coumarin, 1,4-dibromodiacetyl and chloroacetone respectively. The compound 3 were synthesized by nucleophilic addition of aryl/aroylisothiocyanate and enamine (2). The synthesized targeted compounds (4a-4g, 5a-5f and 6a-6e) were evaluated for their in vivo anti-inflammatory activity in carrageenin-induced rat hind paw oedema model at three graded doses employed at 10, 20 and 40 mg/kg body weight using mefanamic acid, ibuprofen and in vivo analgesic activity in acetic acid induced writhing response model at 10 mg/kg dose using ibuprofen as standard drug. The compounds 4a-4f, 5c, 5f, 6c and 6e were evaluated for their in vitro antioxidant nitric oxide radical scavenging assay at the concentrations of 5, 10, 15, 20, 25, 30 and 35 microg/mL using ascorbic acid as standard drug. Among all the targeted compounds 4c showed maximum anti-inflammatory activity of 71% protection at 10 mg/kg and 77% protection at 20 mg/kg to inflamed paw and analgesic activity of 56% inhibition and also maximum in vitro nitric oxide radical scavenging activity having IC(50) value 31.59 microg/mL.
authors.affiliation: School of Pharmacy, Faculty of Medical Sciences, Jimma University, Jimma, Ethiopia. khurshidmolvi@yahoo.co.in
authors.forename: Khurshid I
authors.initials: KI
authors.lastname: Molvi
authors.forename: Mustakim
authors.initials: M
authors.lastname: Mansuri
authors.forename: Vasudevan
authors.initials: V
authors.lastname: Sudarsanam
authors.forename: Madhubhai M
authors.initials: MM
authors.lastname: Patel
authors.forename: Syed Muzaffar A
authors.initials: SM
authors.lastname: Andrabi
authors.forename: Navedul
authors.initials: N
authors.lastname: Haque
mesh_terms: D000700:Analgesics / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D000818:Animals; D000893:Anti-Inflammatory Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D000975:Antioxidants / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D005260:Female; D007249:Inflammation / Q000139:chemically induced / Q000188:drug therapy; D008297:Male; D015394:Molecular Structure; D051381:Rats; D013329:Structure-Activity Relationship; D013876:Thiophenes / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use
chemical_list: D000700:Analgesics; D000893:Anti-Inflammatory Agents; D000975:Antioxidants; D013876:Thiophenes