Synthesis Of 2-Sulfenylindenones By Visible-Light-Mediated Addition Of Sulfur-Centered Radicals To 1,3-Diarylpropynones

A novel, visible-light-mediated method for the synthesis of 2-sulfenylindenones from easily available thiophenols (2.0 equiv.) and 1, 3-diarylpropynones (1.0 equiv.) in the presence of eosin Y (0.02 equiv.) under air atmosphere has been developed. The reaction proceeded smoothly, for a wide range of derivatives of thiophenols and 3-diarylpropynones, to give the expected products in moderate to good yields. Compared with traditional methods, this method is more convenient and avoids using stoichiometric amounts of I-2 and K2S2O8.[GRAPHICS].