Copper-catalyzed fluoroalkylation of alkynes, and alkynyl & vinyl carboxylic acids with fluoroalkyl halides
作者:Jing-Jing Ma、Wen-Bin Yi
DOI:10.1039/c7ob00641a
日期:——
Copper-catalyzed fluoroalkylation of alkynes and alkynyl carboxylic acids has been achieved with high functional-group tolerance and excellent regio- and stereoselectivities. A variety of fluoroalkyl halides including ethyl bromodifluoroacetate can be employed. Additionally, an unprecedented decarboxylative fluoroalkylation of α, β-unsaturated carboxylic acids has been achieved via a radical pathway.
Direct Synthesis of Pentafluoroethyl Copper from Pentafluoropropionate as an Economical C<sub>2</sub>F<sub>5</sub> Source: Application to Pentafluoroethylation of Arylboronic Acids and Aryl Bromides
作者:Hiroki Serizawa、Kohsuke Aikawa、Koichi Mikami
DOI:10.1021/ol501332g
日期:2014.7.3
synthesis of pentafluoroethyl copper (CuC2F5) from a cupratereagent and ethyl pentafluoropropionate as one of the most economical and useful pentafluoroethyl sources was accomplished. The advantages of this method are; all the reagents employed are low-cost and operationally simple, and the CuC2F5 reagent is prepared in virtually quantitative yield. Furthermore, the CuC2F5 reagent prepared was successfully
由铜酸盐试剂和作为最经济和最有用的五氟乙基源之一的五氟丙酸乙酯直接合成了五氟乙基铜(CuC 2 F 5)。这种方法的优点是:所有使用的试剂都是低成本且操作简单的,并且CuC 2 F 5试剂的制备实际上是定量的。此外,制得的CuC 2 F 5试剂已成功应用于芳基硼酸和芳基溴化物的五氟乙基化反应的两种类型,从而以良好至优异的产率提供了五氟乙基化的芳族产品,包括大规模操作。
Fluoride-Triggered Synthesis of 1-Aryl-2,2-difluoroalkenes via Desilylative Defluorination of (1-Aryl)-2,2,2-trifluoroethyl-silanes
作者:Virginie Carreras、Thierry Ollevier
DOI:10.1021/acs.joc.1c01724
日期:2021.9.17
easily prepared via the insertion reaction of trifluoroethyl diazo alkanes into the Si–H bond of tertiary organosilanes. (1-Aryl)-perfluoroalkyl-silanes cleanly afford the corresponding (Z)-1-benzylideneperfluoroalkanes, which upon hydrodefluorination furnish the (E)-β(perfluoroalkyl)styrene derivatives with excellent yield and complete stereoselectivity. A one-pot system involving sequential insertion and
Introduction of the trifluoromethyl (CF3) group into organic compounds has garnered substantial interest because of its significant role in pharmaceuticals and agrochemicals. Here, we report a hydroxylamine‐mediated radical process for C(sp2)−H trifluoromethylation of terminal alkenes. The reaction shows good reactivity, impressive E/Z selectivity (up to >20 : 1), and broad functional group compatibility. Expansion of this approach to perfluoroalkylation and late‐stage trifluoromethylation of bioactive molecules demonstrates its promising application potential. Mechanistic studies suggest that the reaction follows a radical addition and subsequent elimination pathway.