Au(I)‐Catalyzed 6‐ endo ‐ dig Cyclizations of Aromatic 1, <scp>5‐Enynes</scp> to 2‐(Naphthalen‐2‐yl)anilines Leading to Divergent Syntheses of Benzo[ α ]carbazole, Benzo[ c , h ]cinnoline and Dibenzo[ i ]phenanthridine Derivatives

A gold(I)-catalyzed 6-endo-dig cyclization of aromatic 1,5-enyne was developed to synthesize 2-(naphthalen-2-yl)aniline. The functional group tolerance of this cyclization was examined systematically and a possible mechanism was proposed. The derivatization of 2-(naphthalen-2-yl)aniline was carried out to facile access to benzo[α]carbazole, benzo[c,h]cinnoline and dibenzo[i]phenanthridine derivatives in a divergent way.