A novel Cu(I)/Ag(I)-mediated decarboxylative trifluoromethylation of arylpropiolic acids with Me3SiCF3 has been developed for the construction of Csp-CF3 bond under mild conditions. This method proceeds smoothly at room temperature and shows a widely functional compatibility, providing a series of corresponding trifluoromethylated acetylenyl-containing aromatics in good yields.
The carbometallation reactions of fluoroalkylated internal alkynes with various organocopper reagents derived from organolithium, Grignard, and organozinc reagents were examined. All carbocupration reactions proceeded smoothly in a highly regio- and stereo-selective manner to give the corresponding vinylcopper intermediates. The intermediates reacted with H+ smoothly, leading to the trisubstituted
General and selective <i>syn</i>-carboxylation-trifluoromethylation of terminal alkynes: application to the late-stage modification of dehydrocholic acid
alkynes by a Cu(III)–CF3 complex and a carboxylic acid regioselectively and with unusual syn-stereochemistry. This method is broadly applicable to various carboxylic acids and terminal alkynes, producing a range of biologically active trifluoromethyl enol carboxylic esters. The synthetic potential of this method is further demonstrated by the late-stage functionalization of a complex pharmaceutical compound
Cu(III)–CF<sub>3</sub> Complex Enabled Unusual (<i>Z</i>)-Selective Hydro-trifluoromethylation of Terminal Alkynes
作者:Song-Lin Zhang、Chang Xiao
DOI:10.1021/acs.joc.8b01586
日期:2018.9.21
syn-difunctionalization of alkynes using Cu(III)–CF3 complexes/a nucleophilicreagent we developed recently that are also in contrast to the previous anti-difunctionalization chemistry, Cu(III)–CF3 complexes are demonstrated to show distinct reactivity properties compared to conventional CF3 reagents (Togni’s reagents and Umemoto-type reagents) and may thus enable the development of other interesting reactions
Hydrogen-Bonding-Assisted α-F Elimination from Cu–CF<sub>3</sub> for in Situ Generation of R<sub>3</sub>N·HF Reagents: Reaction Design and Applications
作者:Song-Lin Zhang、Jia-Jia Dong
DOI:10.1021/acs.orglett.9b02516
日期:2019.9.6
isted α-F elimination from Cu-CF3 compounds that generates R3N·HF reagents in situ. Combining this strategy and Cu(III)-CF3 chemistry with alkynes, dual fluorination and trifluoromethylation of terminal alkynes is enabled by a single Cu(III)-CF3 compound assisted by a tertiary amine with excellent regio- and stereoselectivity. This strategy also enables the development of other reaction types involving