Rh(III)-catalyzed cascade C–H activation/annulation/lactonization of quinoline-4-ols and alkynes has been reported. A broad range of tetracyclic pyrano[2,3,4-de]quinolines have been prepared in one-step with good functional group tolerance, excellent site selectivity, and high efficiency.
![Graphical abstract: Expeditious synthesis of pyrano[2,3,4-de]quinolines via Rh(iii)-catalyzed cascade C–H activation/annulation/lactonization of quinolin-4-ol with alkynes](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C7CC04113F&imageInfo.ImageIdentifier.Year=2017)
G. Liao, H. Song, X. Yin and B. Shi, Chem. Commun., 2017, 53, 7824 DOI: 10.1039/C7CC04113F
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