Iridium complex immobilized on a high-nitrogen containing covalent triazine framework derived from 2,5-pyrazinedicarbonitrile as a recyclable catalyst for the selective N-alkylation of aminobenzenesulfonamides with alcohols

Abstract

A new-type of covalent triazine framework derived from 2,5-pyrazinedicarbonitrile as a monomer with a high N/C ratio was designed and synthesized by trimerization at 400 °C with ZnCl₂ as a catalyst and salt melt via the ionothermal technique. After the metalation, the resulting Cp*Ir@CTF was proven to be a general and efficient catalyst for the selective N-alkylation of aminobenzenesulfonamides with alcohols to amino-(N-alkyl)benzenesulfonamides. Furthermore, the synthesized catalyst could be recycled by simple filtration without obvious loss of activity during six cycles. Notably, this research exhibited the practical utilization of covalent triazine framework-supported transition metal catalysts for the hydrogen autotransfer process.