Preparation and Oxidative-Chlorination Splitting of Nitro Derivatives OF 1,4-Dithiino[2,3-C:5,6-C′]Diquinoline as a Source of 4-Substituted 5- and 8-Nitro-3-Quinolinesulfonic Acid Derivatives
作者:Elwira Chrobak、Andrzej Maślankiewicz、Magdalena Chyćko、Leszek Skrzypek、Małgorzata Szmielew、Maria J. Maślankiewicz、Joachim Kusz、Maciej Zubko
DOI:10.1080/10426507.2012.680085
日期:2012.10.1
Treatment of 1,4-dithiino[2,3-c:5,6-c']diquinoline (a thioquinanthrene) (1a) with an excess of nitrating mixture (0 degrees C, 14 days) led to a mixture of mono-and dinitrothioquinanthrene 7-oxides 2b-e and 2f-h. This mixture was: (i) reduced to a mixture of mono- and dinitrothioquinanthrenes 1b-e, or (ii) oxidatively chlorinated with a gaseous chlorine/80% acetic acid/hydrochloric acid system to a mixture of 4-chloro-3-chlorosulfonylquinoline 3a and its 5- and 8-nitroderivatives 3b and 3d. Sulfochlorides 3a-d were independently synthesized from 3,4'-diquinolinyl sulfides 4 and converted to the respective 4-dimethylamino-3-quinoline-N,N-dimethylsulfonamides 9a-d.