Bronsted-Acid-Promoted Selective C2-N1 Ring-Expansion Reaction of Indoles toward Cyclopenta[b]quinolines

A novel Bronsted-acid-promoted selective C2-N1 ring-expansion reaction of indoles has been developed that provides a rapid and efficient protocol for the preparation of fused quinolines. A variety of corresponding quinolines were obtained in high yields. Controlled experiments revealed that C2-spiroindolenines might be intermediates of this C2-N1 ring-expansion reaction. The notable advantages of this process include excellent yields, good functional group tolerance, and operational simplicity.

Automated summary

A novel Bronsted-acid-promoted selective C2-N1 ring-expansion reaction of indoles has been developed for the efficient preparation of fused quinolines. The process offers advantages such as high yields, good functional group tolerance, and simplicity.