Cu/Pd cooperatively catalyzed tandem C-N and C-P bond formation: access to phosphorated 2H-indazoles.

A novel Cu/Pd cooperatively catalyzed tandem C-N and C-P bond formation reaction between 2-alkynyl azobenzenes and P(O)H compounds has been developed. This reaction provides a convenient approach for the synthesis of various phosphorated 2H-indazoles in moderate to good yields, exhibiting good functional group tolerance and high atom economy.