A cobalt-catalyzed aminofluorination
reaction of styrenes with N-fluorosulfonamides serving
as both the amination and fluorination
agents has been developed. The switch of selectivity in this catalytic
reaction from aminofluorination to diamination could be easily achieved
by the addition of 1.0 equiv of PPh3. Both transformations
tolerated a wide array of substrates under mild reaction conditions.
A cobalt-catalyzed modular [3+2] assembling of unsaturated hydrocarbons and β-dicarbonyls is reported. This protocol features mild reaction conditions and a broad substrate scope, providing facile entries toward diverse multi-functionalized dihydrofuran...
Fused polycyclic furans are privileged structural scaffolds in materials chemistry, including organic semiconductors. Specifically, indeno[1,2-c]furans are an interesting type of polycyclic furans featuring a fused furan and indenone framework. Unfortunately, limited studies on their photophysical properties have been performed, probably owing to the lack of efficient and straightforward approaches to those compounds. Herein, we have developed a cobalt-catalyzed radical−polar crossover cyclization of the readily available o-alkynylaryl β-carbonyls to afford diverse indeno[1,2-c]furans. Photophysical and DFT calculations were also carried out, suggesting that the obtained indeno[1,2-c]furans exhibit promising electronic and optical properties.
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