2024
DOI: 10.1002/adsc.202400712
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Lewis Base Controlled (4+3) and (4+2) Annulations of MBH Carbonates with Benzofuran‐Derived Azadienes: Access to Highly Substituted Benzofuro[3,2‐b]Azepines and Spirotetrahydroquinolines

Kai‐Kai Wang,
Ya‐Fei Li,
Lan‐Xin Li
et al.

Abstract: Catalyst‐controlled switchable (4 + 3) and (4 + 2) annulation reactions of Morita–Baylis–Hillman carbonates with benzofuran‐derived azadienes have been established. Employing PCy3 as the catalyst, the reaction could provide a variety of synthetically useful benzofuro[3,2‐b]azepines in good yields (80‐92%) with excellent chemo‐ and regioselectivities via (4 + 3) cycloaddition reactions. Whereas changing the catalyst from PCy3 to DMAP, the chemo‐ and regioselectivities were switched to construct highly substitut… Show more

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