Journal
ORGANIC LETTERS
Volume 20, Issue 23, Pages 7442-7446Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.8b03169
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Funding
- JSPS KAKENHI [JP25110002, JP17K17863]
- Kyoto Technoscience Center
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A palladium-catalyzed double carbonylative cyclization of benzoins has been developed, which realizes the synthesis of bis-ester-bridged stilbenes just in two steps from aldehydes. Thus, the obtained fully fused tetracyclic pi-systems have a pyrano[3,2-b]pyran-2,6-dione (PPD) core on their center, showing two reversible reductions at low potentials. In addition, their photoluminescence properties are strikingly affected by the aromatic rings fused to the PPD core; bis-thieno-fused PPDs are found to be excellent fluorophores with quantum yields up to 0.98.
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