Synthesis of Alkylated Monofluoroalkenes via Fe-Catalyzed Defluorinative Cross-Coupling of Donor Alkenes with <i>gem</i>-Difluoroalkenes
作者:Ling Yang、Wei-Wei Ji、E Lin、Ji-Lin Li、Wen-Xin Fan、Qingjiang Li、Honggen Wang
DOI:10.1021/acs.orglett.8b00471
日期:2018.4.6
A reductive cross-coupling of gem-difluoroalkenes with diverse unactivated and heteroatom substituted olefins through a Fe-catalyzed hydrogen atom transfer (HAT) strategy is reported. Different from the previous HAT-type olefin cross-coupling reactions, the presence of a fluorineatom in the molecule results in a stereoselective β-F cleavage, leading to a C(sp2)–C(sp3) bond formation. A wide variety
Palladium-Catalyzed Suzuki-Miyaura Cross-Coupling of Secondary α-(Trifluoromethyl)benzyl Tosylates
作者:Marta Brambilla、Matthew Tredwell
DOI:10.1002/anie.201706631
日期:2017.9.18
palladium‐catalyzed C(sp3)−C(sp2) Suzuki–Miyaura cross‐coupling of aryl boronic acids and α‐(trifluoromethyl)benzyl tosylates is reported. A readily available, air‐stable palladium catalyst was employed to access a wide range of functionalized 1,1‐diaryl‐2,2,2‐trifluoroethanes. Enantioenriched α‐(trifluoromethyl)benzyl tosylates were found to undergo cross‐coupling to give the corresponding enantioenriched
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
Stereodivergent hydrodefluorination of gem-difluoroalkenes: selective synthesis of (Z)- and (E)-monofluoroalkenes
作者:Ryoto Kojima、Koji Kubota、Hajime Ito
DOI:10.1039/c7cc05225a
日期:——
We have developed a novel approach for the stereodivergent hydrodefluorination of gem-difluoroalkenes using copper(I) catalysts to obtain stereodefined monofluoroalkenes. Both (Z)- and (E)-terminal monofluoroalkenes were obtained by hydrodefluorination of gem-difluoroalkenes in the presence of copper(I) catalysts and diboron or hydrosilane, respectively, with high stereoselectivity. DFT calculations
A catalytic C(sp2)–F bond carboxylation with CO2 is reported; the reaction is enabled by dual photoredox/palladium catalysis and involves a crucial fluoroalkenyl radical intermediate.