A new synthesis of 5-hydroxy-benzo[a]carbazoles has been achieved by employing the photoinduced intramolecular C–H insertion of 2-aryl-3-(α-diazocarbonyl)indoles as the key step. This method is applicable to the synthesis of natural products 6-cyano-5-methoxy-indolo[2,3-a]carbazoles 8 and 11 and their derivatives.
![Graphical abstract: Synthesis of benzo[a]carbazoles and indolo[2,3-a]carbazoles via photoinduced carbene-mediated C–H insertion reaction](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C4RA00442F&imageInfo.ImageIdentifier.Year=2014)
J. Yang, Q. Zhang, W. Zhang and W. Yu, RSC Adv., 2014, 4, 13704 DOI: 10.1039/C4RA00442F
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