Light-mediated sulfonyl-iodination of ynamides and internal alkynes.

We synthesized tetrasubstituted olefins regioselectively and stereoselectively from ynamides and internal alkynes with sulfonyl iodides under blue LEDs in few minutes. The key features are being metal-free, easy to handle, simple, broad in scope, and environmentally friendly. Furthermore, a gram-scale experiment was conducted, and the synthesized corresponding sulfonyl-iodinated products were smoothly altered into various other products.