Ir-Porphyrin-Based Metal–Organic Framework as a Dual Metallo- and Photocatalyst for Inert Alkyl C(sp3)−H Bond Activation and Direct Functionalization
The activation and transformation of inert alkyl C(sp3)−H bonds to obtain high-value fine chemicals by sustainable solar energy are of great significance. Herein, by incorporating IrIII–porphyrin into metal–organic frameworks (MOFs) to stabilize the highly active carbene, we reported a new approach to combining metallo- and photocatalysis to efficiently accelerate carbene migratory insertion and C–H bond activation via the radical coupling pathway for inert alkane functionalization. The in situ-formed carbene was restricted into the pores of MOFs to produce IrIII–carbene, allowing the first-time isolation and structural characterization of the IrIII–carbene intermediate which are not stabilized by a heteroatom. The product of the reaction, especially the cyclic ethers as substrates, suggested that the functionalization of the α position of the alkoxy group was favored. Additionally, the new approach could be extended to stabilize the metal carbene intermediates to realize C(sp3)−H bond alkylation and arylation.
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