Efficient synthesis of 3,6,13,16-tetrasubstituted-tetrabenzo[,,,]coronenes by selective C-H/C-O arylations of anthraquinone derivatives.

An efficient synthesis of tetrabenzo[,,,]coronene derivatives having alkyl and alkoxy substituents at the 3, 6, 13, and 16-positions was achieved based on the ruthenium-catalyzed coupling reactions of anthraquinone derivatives with arylboronates via C-H and C-O bond cleavage. The reaction sequence involving the arylation, carbonyl methylenation, and oxidative cyclization effectively provided various tetrabenzo[,,,]coronenes in short steps from readily available starting materials. Tetrabenzo[,,,]coronenes possessing two different types of substituents were obtained selectively by sequential chemoselective C-O arylation and C-H arylation. The H NMR spectra of the tetrabenzo[,,,]coronene product indicated its self-assembling behavior in CDCl.