3'-METHYLSULFINYL-3,4'-DIQUINOLINYL SULFIDES

Reactions of 4-methoxy- or 1,4-dihydro-4-oxo-3'-methylthio-3,4'-diquin olinyl sulfides 1 and 7 with a nitrating mixture ran as the 3'-methylt hio group S-mono-oxidation followed by C-6- and C-8-nitration and led to the mixture composed of products 3, 4, 5 and 6 (in the case of subs trate 1) or compounds 5 and 6 (for substrate 7). In the reaction with hydrochloric acid 4-methoxy-3'-methylsulfinyl-3,4'-diquinolinyl sulfid es 3 and 4 could be hydrolysed to 3'-methylsulfinyl-4(1H)-quinolinones 5 or 6 respectively, the methylsulfinyl group remaining unaffected.