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Keywords:

  • cross-coupling;
  • heterogeneous catalysis;
  • imines;
  • metal–organic frameworks;
  • transition-metal-free coupling

Abstract

A highly efficient, simple, and versatile transition-metal-free metal–organic framework catalytic system is proposed for the oxidative coupling of amines to imines. The catalytic protocol features high activities and selectivities to target products; compatibility with a variety of substrates, including aliphatic amines and secondary amines; and the possibility to efficiently and selectively promote amine cross-coupling reactions. A high stability and recyclability of the catalyst is also observed under the investigated conditions. Insights into the reaction mechanism indicate the formation of a superoxide species able to efficiently promote oxidative couplings.