Construction of Benzo-Fused Polycyclic Heteroaromatic Compounds through Palladium-Catalyzed Intramolecular C-H/C-H Biaryl Coupling

Dibenzo-fused five-membered heteroaromatic compounds, including dibenzofuran, carbazole, and dibenzothiophene, are fundamental structural units in various important polycyclic heteroaromatic compounds. The intramolecular C-H/C-H biaryl coupling of diaryl (thio)ethers and amines based on palladium(II) catalysis under oxidative conditions is known to be one of the most effective, step-economic methods for their construction. Representative examples for the construction of structurally intriguing pi-extended polycyclic heteroaromatics through catalytic coupling reactions are briefly summarized in this mini-review.

Automated summary

Dibenzo-fused five-membered heteroaromatic compounds, such as dibenzofuran, carbazole, and dibenzothiophene, are important structural units in various polycyclic heteroaromatic compounds. The intramolecular C-H/C-H biaryl coupling of diaryl (thio)ethers and amines based on palladium(II) catalysis under oxidative conditions is an effective method for their construction. This mini-review briefly summarizes representative examples of constructing structurally intriguing pi-extended polycyclic heteroaromatics through catalytic coupling reactions.