Organic Letters
Letter
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Scheme 6. Proposed Mechanism
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In summary, we developed a novel method to synthesize
dibenzopyranones via direct oxidative annulation of benzoic
acids and phenols. This process avoids prefunctionalization of
both starting materials and significantly shortens synthetic
procedures. The broad substrate scope and good functional
group compatibility provides the potential for applications.
Mechanistic studies indicate that C−H activation occurs before
lactonization and Cu(OAc)2 plays dual important roles. Further
developments are underway.
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ASSOCIATED CONTENT
* Supporting Information
The Supporting Information is available free of charge on the
■
S
Experimental procedures, characterization data, and NMR
AUTHOR INFORMATION
■
Corresponding Author
ORCID
(9) O’Hagan, D. Chem. Soc. Rev. 2008, 37, 308.
(10) (a) Amii, H.; Uneyama, K. Chem. Rev. 2009, 109, 2119. (b) Wang,
Z.-X.; Guo, W.-J.; Shi, Z.-J., Catalysis In C−Cl Activation. In
Homogeneous Catalysis for Unreactive Bond Activation; John Wiley &
Sons2014; p 1.
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(12) Zhu, F.; Li, Y.; Wang, Z.; Wu, X.-F. Angew. Chem., Int. Ed. 2016,
55, 14151.
Notes
The authors declare no competing financial interest.
ACKNOWLEDGMENTS
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We gratefully acknowledge financial support from the “973”
Project from the MOST of China (2013CB228102,
2015CB856600) and NSFC (No. 21431008).
(13) Simmons, E. M.; Hartwig, J. F. Angew. Chem., Int. Ed. 2012, 51,
3066.
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