An efficient Cu-catalyzed cascade reaction involving N–O bond cleavage and C–C/C–N/N–N bond formations is developed to afford various 1,3- and 1,3,4-substituted pyrazoles.
Three COming together: The first carbonylative Heck coupling reaction of arylbromides and vinyl ethers leading to 1‐aryl‐3‐alkoxy‐2‐propen‐1‐ones has been established (see scheme). Based on this coupling methodology, a novel one‐pot synthesis of aryl‐substituted pyrazoles was also realized.