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Note | Regular issue | Vol 71, No. 2, 2007, pp.411-418
Published online, 22nd December, 2006
DOI: 10.3987/COM-06-10930
Heterocycles [h]Fused on 4-Oxoquinoline-3-carboxylic Acid, II. A Facile Synthesis of Some 2,7-Dioxo[1,4]thiazino[2,3-h]quinoline-8-carboxylic Acids

Mohammed H. Al-Huniti, Jalal A. Zahra, and Mustafa M. El-Abadelah*

*Chemistry Department, Faculty of Science, University of Jordan, Amman 11942, Jordan


Model tetrahydro[1,4]thiazino[2,3-h]quinoline-8-carboxylic acids (7a-c) are synthesized via reductive lactamisation, using sodium dithionite, of the respective 7-[(carboxyalkyl)thio]-8-nitro-1,4-dihydroquinolines (5a-c). The latter compounds are made accessible via the reaction of 7-chloro-1-cyclopropyl-6-flouro-8-nitro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid (4) with each of α-mercaptoacetic, α-mercaptopropionic and α-mercaptosuccinic acids in aqueous ethanol and triethylamine. The suggested structures of 5a-c and 7a-c are supported by microanalytical and spectral (IR, MS, NMR) data.