Transition Metal‐Mediated Aromatic Ring Construction

Recent significant advance in the area of the transition metal-mediated aromatic ring construction reactions enables the construction of substituted benzenoid aromatic rings with efficient and convenient manners. These aromatic ring construction reactions provide promising new routes to the complex benzenoid aromatic compounds. In this chapter, I summarize the intermolecular multicomponent reactions and the intramolecular single-component reactions, which are able to construct benzenoid aromatic rings. As the intermolecular multicomponent reactions, three-component cycloaddition reactions (21.2 [2+2+2] cycloaddition and 21.3 [3+2+1] cycloaddition) and two-component cycloaddition reactions (21.4 [4+2] cycloaddition) are described. As the intramolecular single-component reactions, cycloaromatization reactions (21.5 intramolecular hydroarylation of alkynes and cyclization via transition metal vinylidenes) are described.