2024
DOI: 10.1021/acs.joc.4c01854
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Intramolecular/Intermolecular Sequential Cyclization Accompanied by Double C–F Bond Cleavage: Access to Tricyclic Fluorine-Containing Pyrano[3,2-c]chromenes

Dong-Sheng Yang,
Xiang-Long Chen,
Chun-Yan Wu
et al.

Abstract: Defluorinative cyclization of CF 3 -alkenes has emerged as a reliable strategy for crafting intricate polycyclic frameworks. In this study, a facile defluorinative bicyclization approach was developed for the construction of 4H,5H-pyrano[3,2c]chromenes under mild conditions involving a sequence of intramolecular cyclization and intermolecular defluoroheterocyclization. A variety of polysubstituted 4H,5H-pyrano[3,2-c]chromenes featuring C2-fluorine could be synthesized in good yields with excellent tolerance to… Show more

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