An indium(III)-catalyzed intramolecular Friedel–Crafts annulation for the efficient synthesis of pyrrolo[3,2,1-ij]quinolin-4-ones is described. The products are formed in good to excellent yields (51–97%) with diastereoselectivities up to >99 : 1 dr.
![Graphical abstract: A general intramolecular Friedel–Crafts approach to functionalized pyrrolo[3,2,1-ij]quinolin-4-ones](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C2CC34650H&imageInfo.ImageIdentifier.Year=2012)
D. V. Patil, M. A. Cavitt, P. Grzybowski and S. France, Chem. Commun., 2012, 48, 10337 DOI: 10.1039/C2CC34650H
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