SCHEDULED MAINTENANCE
A variety of cycloheptapyrane derivatives were prepared via Ni-catalyzed formal [8+3] cycloaddition of tropones with 1,1-cyclopropanediesters. The asymmetric version of the process can be achieved using either an enantiomerically enriched cyclopropane as the starting material or a racemic cyclopropane and a chiral Lewis acid.
![Graphical abstract: Ni-Catalyzed [8+3] cycloaddition of tropones with 1,1-cyclopropanediesters](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C3CC45552A&imageInfo.ImageIdentifier.Year=2013)
R. Tejero, A. Ponce, J. Adrio and J. C. Carretero, Chem. Commun., 2013, 49, 10406 DOI: 10.1039/C3CC45552A
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