Tunable Synthesis of Monofluoroalkenes and <i>Gem‐</i>Difluoroalkenes via Solvent‐Controlled Rhodium‐Catalyzed Arylation of 1‐Bromo‐2,2‐difluoroethylene
作者:Wen‐Yan Xu、Zhe‐Yuan Xu、Ze‐Kuan Zhang、Tian‐Jun Gong、Yao Fu
DOI:10.1002/anie.202310125
日期:2023.10.2
We report a solvent-controlled rhodium-catalyzed tunable arylation of 1-bromo-2,2-difluoroethylene, which allows the synthesis of monofluoroalkenes and gem-difluoroalkenes from readily available feedstocks. This study provides a useful strategy for the divergent synthesis of fluorine-containing scaffolds and sheds light on the importance of solvent selection in catalytic reactions.
Regioselective Fluorination of 1-(2,2-Dibromovinyl)benzene Derivatives with Wet Tetra-<i>n</i>-butylammonium Fluoride: One-Pot Synthesis of (<i>Z</i>)-1-(2-Bromo-1-fluorovinyl)benzenes
A direct fluorination of 1-(2,2-dibromovinyl)benzene derivatives using wet tetra-n-butylammonium fluoride (TBAF·3H2O) as either a base or a fluorine source in toluene was accomplished, which provided (Z)-1-(2-bromo-1-fluorovinyl)benzene compounds in up to 81% yields with high regioselectivities. This reaction results strongly depend upon the reaction conditions. The mechanism of this reaction was investigated
The difunctionalization of terminal alkynes was achieved with silver fluoride (AgF) and N-bromosuccinimide (NBS) as halogen sources. The presence of the halide moiety greatly enhances the reactivity of the vinyl fluoride compounds that can probably can be transformed into various products that are difficult or even impossible to obtain via direct fluorination. Meanwhile, the monofluoro<.>alkenes were