title: Facile synthesis of some novel pyrido[3',2':4,5]thieno[2,3-b][1,4]thiazine-8-carboxylic acids.
abstract: Model tetrahydropyrido[3',2':4,5]thieno[2,3-b][1,4]thiazines 9a-c were synthesized via reductive lactamization, using sodium dithionite, of the respective 2-[(carboxyalkyl)thio]-3-nitro-4,7-dihydrothieno[2,3-b]pyridine-5-carboxylic acids 7a-c. The latter derivatives were made via interaction of 2-chloro-7-cyclopropyl-3-nitro-4,7-dihydrothieno[2,3-b]pyridine-5-carboxylic acid (6) with each of alpha-mercaptoacetic, alpha-mercaptopropionic, and alpha-mercaptosuccinic acids and triethylamine in aqueous acetone at room temperature. The structures of 7a-7c and 9a-9c are supported by microanalytical and spectral (IR, MS, NMR) data. Compounds 9a and 9c showed potent inhibitory activity against the IGROV1 (Ovarian Cancer) cell line.
authors.affiliation: Chemistry Department, Faculty of Science, The University of Jordan, Amman 11942, Jordan. mmharb@ju.edu.jo
authors.forename: Mohammed H
authors.initials: MH
authors.lastname: Al-Huniti
authors.forename: Mustafa M
authors.initials: MM
authors.lastname: El-Abadelah
authors.forename: Jalal A
authors.initials: JA
authors.lastname: Zahra
authors.forename: Salim S
authors.initials: SS
authors.lastname: Sabri
authors.forename: Arnd
authors.initials: A
authors.lastname: Ingendoh
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry; D002264:Carboxylic Acids / Q000138:chemical synthesis* / Q000737:chemistry; D045744:Cell Line, Tumor; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D013843:Thiazines / Q000138:chemical synthesis* / Q000737:chemistry; D013876:Thiophenes / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000970:Antineoplastic Agents; D002264:Carboxylic Acids; D013843:Thiazines; D013876:Thiophenes