2-Azidoacrylates undergo [4+3] annulation with phthalides under anionic conditions at low temperatures to furnish 5-hydroxy-2-benzazepinones, the formation of which represents a new concept for the construction of azepines as well as a new reactivity of 2-azidoacrylates.
![Graphical abstract: Anionic [4+3] heteroannulation of 2-azidoacrylates: a modular synthesis of 2-benzazepin-1-ones](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C2CC30279A&imageInfo.ImageIdentifier.Year=2012)
B. K. Dinda, A. K. Jana and D. Mal, Chem. Commun., 2012, 48, 3999 DOI: 10.1039/C2CC30279A
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