Abstract
An efficient synthesis of 2H-pyrans is achieved by indium (III) chloride-catalyzed reactions of 1,3-dicarbonyl compounds with a variety of α,β-unsaturated aldehydes in moderate yields. This method has been applied to the synthesis of pyranocoumarins, pyranophenalenones, and pyranoquinolinone alkaloids.
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Lee, Y. R., Kim, D. H., Shim, J. J., Kim, S. K., Park, J. H., Cha, J. S., & Lee, C. S. (2002). One-pot synthesis of 2H-pyrans by indium(III) chloride-catalyzed reactions. Efficient synthesis of pyranocoumarins, pyranophenalenones, and pyranoquinolinones. Bulletin of the Korean Chemical Society, 23(7), 998–1002. https://doi.org/10.5012/bkcs.2002.23.7.998
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