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The rapid and convenient construction of benzo-fused cyclic compounds has attracted significant attention due to their wide applications in various fields. As important building blocks and organic synthons, aryltriazene compounds can be applied in the synthesis of a variety of heterocycles and carbocycles. With promotion by Lewis or Brønsted acids, aryltriazenes are readily transformed into reactive aryl cations which can undergo intramolecular cyclization to form diverse benzo-fused cyclic compounds. This account covers recent developments in the synthesis of benzo-fused cyclic compounds via intramolecular cyclization of aryltriazenes.1 Introduction2 Synthesis of Heterocycles via Intramolecular C–N Bond Formation2.1 Palladium-Catalyzed Regioselective Synthesis of N-Aryl Benzotriazoles2.2 Brønsted Acid Catalyzed Stereoselective Synthesis of trans-3-Alkenyl Indazoles2.3 Lewis Acid Promoted Synthesis of Unsymmetrical and Highly Functionalized Carbazoles3 Synthesis of Heterocycles via Intramolecular C–O Bond Formation3.1 Lewis Acid Promoted Synthesis of Dibenzofurans and Dihydrobenzofurans3.2 Lewis Acid Promoted Synthesis of Dibenzopyranones and Coumarins3.3 Lewis Acid Promoted Synthesis of 2-Hydroxyflavanones4 Synthesis of Carbocycles via Intramolecular C–C Bond Formation4.1 Lewis Acid Mediated Synthesis of Unsymmetrical and Functionalized Polycyclic Aromatic Hydrocarbons4.2 Brønsted Acid Mediated Synthesis of Fluorene Derivatives5 Conversion into Azides and then into Heterocyclic Compounds6 Conclusion