“…To date, an array of approaches have emerged for the synthesis of the dibenzofuran motifs, which can be divided into two main categories (Scheme ). First, cyclization of unsubstituted (X = H) or 2-substituted phenoxybenzenes (X = halogen, CO 2 H, BF 3 K, OTs, N 2 + ) − was used to assemble the dibenzofuran framework through the formation of a C–C bond in the presence of a Cu, Ag, Pd, or Rh catalyst (eq 1). Second, Pd- or Cu-catalyzed intramolecular O-arylation of 2-arylphenols or 2-(2′-haloaryl)phenols opened up a new path to dibenzofurans (eq 2).…”