A base-promoted [3 + 2] annulation reaction of ethyl α-chlorocyclopropaneformates with 1,3-dicarbonyl compounds is described. This method provides an efficient and straightforward route to acidic multi-substituted fulvenes with distinctive properties.
![Graphical abstract: Synthesis of functionalized fulvenes: [3 + 2] annulation of ethyl α-chlorocyclopropaneformates with 1,3-dicarbonyl compounds](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C4OB01973C&imageInfo.ImageIdentifier.Year=2014)
Y. Zhu, M. Zhang, H. Yuan and Y. Gong, Org. Biomol. Chem., 2014, 12, 8828 DOI: 10.1039/C4OB01973C
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