the CF2CO2Et moiety into electron-richarenes. The copper-catalyzed process uses commercially available and inexpensive BrCF2CO2Et as a fluorinated building block. This radical-free reaction proceeds smoothly to give the desired difluoromethylated arenes in modest to good yields with a Friedel–Crafts-type regioselectivity. The direct introduction of α,α-difluoromethylated amides was also investigated
作者:Jaehun Jung、Eunjin Kim、Youngmin You、Eun Jin Cho
DOI:10.1002/adsc.201400542
日期:2014.9.15
Difluoroalkylated aromatics are important structural motifs in pharmaceutical and agrochemical applications. Herein, we report their synthesis by a mild, efficient, and convenient method using visible light photoredox catalysis. A variety of unactivated aromatics were difluoroalkylated with ethyl 2‐bromo‐2,2‐difluoroacetate (BrCF2CO2Et) in the presence of the triscyclometalated Ir complex fac‐[Ir(ppy)3]
在医药和农业化学应用中,二氟烷基化的芳族化合物是重要的结构基序。在本文中,我们报告了使用可见光光氧化还原催化的温和,有效和方便的方法合成它们。在室温下可见光下,在三环金属化Ir络合物fac- [Ir(ppy)3 ]存在下,将各种未活化的芳族化合物用2-溴-2-2,2-二氟乙酸乙酯(BrCF 2 CO 2 Et)进行二氟烷基化。结果表明,含有CF 2 CO 2 Et部分的反应产物可以转化为多种其他含CF 2的芳烃,证明了本方法的合成效用。
Synthesis of α-Fluorinated Areneacetates through Photoredox/Copper Dual Catalysis
作者:Guillaume Levitre、Albert Granados、María Jesús Cabrera-Afonso、Gary A. Molander
DOI:10.1021/acs.orglett.2c00969
日期:2022.5.6
report a metallaphotoredox method for the preparation of fluoroalkyl arenes based on the synergistic combination of Ir/Cu dual catalysis from boronic acids. The mild conditions allow broad functional group tolerance, including substrates containing aldehydes, free phenols, and N-Boc-protected amines. Mechanistic investigations support a process proceeding via photoredox/copper dual catalysis.
Cobalt-catalyzed cross-coupling reaction of arylzinc reagents with ethyl bromodifluoroacetate
作者:Keisuke Araki、Munenori Inoue
DOI:10.1016/j.tet.2013.03.041
日期:2013.5
Transition metal-catalyzed cross-coupling reactions of arylmetal reagents with ethyl bromodifluoroacetate have been explored. After intensive investigations, we have successfully found that a cobalt-catalyzed cross-coupling reaction (catalytic alkoxycarbonyldifluoromethylation) of arylzincreagents with ethyl bromodifluoroacetate smoothly proceeded to afford the corresponding ethyl aryldifluoroacetates