期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 7, 页码 3493-3497出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202012842
关键词
annulations; C-H activation; dearomatization; fluorescence; spiro-compounds
资金
- National NSF of China [22031007, 22005204]
- Sichuan Science and Technology Program [2020YJ0245, 2020YJ0302]
This paper presents a palladium-catalyzed direct [4+1] spiroannulation reaction to construct spirofluorenyl naphthalenones under mild conditions, providing a potential synthetic strategy for the innovation of optoelectronic materials. The study also demonstrates the tolerance of reactive functional groups and the potential for rapidly assembling structurally new TADF materials.
Disclosed here is a palladium-catalyzed direct [4+1] spiroannulation of ortho-C-H bonds of naphthols with cyclic diaryliodonium salts to construct spirofluorenyl naphthalenones (SFNP) under mild reaction conditions. This spiroannulation directly transforms the hydroxy group into a carbonyl group, and also tolerates reactive functional groups such as the halo groups, which provide an opportunity to rapidly assemble structurally new thermally activated delayed fluorescent (TADF) materials that feature a carbonyl group with an adjacent spirofluorenyl unit as the acceptor. As an illustrated example, the OLED device utilizing the assembled DMAC-SFNP as the host material exhibits a low turn-on voltage of 2.5 V and an ultra-high external quantum efficiency of 32.2 %. This work provides inspiration for structurally new TADF materials, and also displays the potential of C-H activation as a synthetic strategy for the innovation of optoelectronic materials.
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