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An efficient method for carbon–carbon bond formation is described. The process employs the palladium-catalyzed and copper-mediated cross-coupling of quinoline-2-(1 H)-thiones with arylboronic acids or alkynes through C–S bond cleavage without an inert atmosphere. The method provides rapid and general access to a diverse range of 2-substituted quinolines in a single step from a wide range of quinoline-2-(1 H)-thiones and arylboronic acids or alkynes. [ABSTRACT FROM AUTHOR]

Graphical abstract Highlights • Methylation of quinoline-2-thione under mild and environmentally friendly conditions. • DMSO as readily available source of methyl group. • Using UV light without metal- and dye-photocatalyst. Abstract An UV-light-induced S- methylation of quinoline-2-thione was completed by using dimethyl sulfoxide as methyl reagent. A series of quinoline methyl sulfides were prepared in moderate to good yields under environmentally friendly and mild conditions. [ABSTRACT FROM AUTHOR]