A Cu-catalyzed tandem dehydrogenation/dehalogenation sequential reaction along with N-arylation has been developed for the synthesis of pyridazinone derivatives in an aerobic and aqueous environment. To achieve the transformation of three chemical bonds in a one-pot reaction, a multifunctional copper catalyst was used which afforded excellent activity, high selectivity, and recyclability. The catalytic system consists of a water-soluble Cusalen complex and Na2CO3 in neat water and an air atmosphere.
A Copper-Catalyzed Aerobic Cascade Dehydrogenative- Dehalogenative Reaction
A copper‐catalyzed cascade dehydrogenative and dehalogenativereaction of halogenated 6‐phenyl‐4,5‐dihydropyridazin‐3(2H)‐ones to 6‐phenylpyridazin‐3(2H)‐ones has been developed. Moreover, the catalytic system consisting of copper(II) acetate/sodium carbonate/pyridine exhibits high reactivity and selectivity with oxygen as the terminal oxidant.