Visible-light induced copper(i)-catalysed denitrogenative oxidative coupling of hydrazinylpyridines with terminal alkynes

An effective and green approach to oxidative C_sp2–C_sp coupling of 2-hydrazinylpyridine with terminal alkynes to form 2-(alkyl/arylethynyl) pyridine via N₂ elimination through the cleavage of a non-activated C–N bond under low energy visible light at room temperature (42 examples).