The first palladium-catalyzed decarbonylative
coupling of phenyl
2-azinecarboxylates and arylboronic acids is presented. The key for
the development of this decarbonylative coupling is the use of Pd/dcype
as a catalyst. A wide range of 2-azinecarboxylates can undergo the
present coupling reaction to afford 2-arylazines. By combination with
previously reported nickel-catalyzed decarbonylative coupling, we
achieved a chemoselective sequential decarbonylative coupling of pyridine
dicarboxylate to synthesize 2,4-diarylpyridine.