Stereoselective formation of Z-monofluoroalkenes by nickel-catalyzed defluorinative coupling of gem‑difluoroalkenes with lithium organoborates
作者:Yisa Xiao、Weichen Huang、Qilong Shen
DOI:10.1016/j.cclet.2022.01.020
日期:2022.9
method for stereoselective construction of Z-monofluoroalkenes by nickel-catalyzed defluorinative coupling of gem‑difluoroalkenes in mild conditions was described. The combination of lithiumorganoborate and ZnBr2 generated in situ lithiumaryl zincates, which facilitates the transmetalation step of the nickel-catalyzed cross couplingreaction.
Synthesis of fluorinated enynes and dienes via 1-bromo 2-fluoro alkenes
作者:Said Eddarir、Hélène Mestdagh、Christian Rolando
DOI:10.1016/s0040-4039(00)71220-2
日期:1991.1
A stereospecific synthesis of fluorinated enynes and dienes was performed through palladium-catalyzed condensation of 1-bromo-2-fluoroalkenes, synthesized either through “BrF” addition to the corresponding alkynes or through bromineaddition and HBr elimination on fluoroesters, with monosubstitued alkynes or alkenes.
Stereoselective Rhodium(I)-Catalyzed C–F Bond Arylation of Tri- and Tetrasubstituted <i>gem</i>-Difluoroalkenes with Boronic Acids
作者:Hao Tan、Yuwei Zong、Yihan Tang、Gavin Chit Tsui
DOI:10.1021/acs.orglett.3c00108
日期:2023.2.10
We herein describe a highly diastereoselective rhodium(I)-catalyzed C–F bond functionalization of gem-difluoroalkenes with arylboronic acids. In contrast to previously developed Pd(II)- and Pd(0)-catalyzed methods, the Rh(I)/BINAP catalytic system enabled the C–F bond arylation of both trisubstituted β,β-difluorostyrenes and tetrasubstituted β,β-difluoroacrylates in >99:1 dr toward the synthesis of
Stereoselective synthesis of fluoroalkenes via (Z)-2-fluoroalkenyliodonium salts
作者:Masanori Yoshida、Ayumu Komata、Shoji Hara
DOI:10.1016/j.tet.2006.05.085
日期:2006.9
Stereoselective synthesis of fluoroalkenes is described. (Z)-2-Fluoro-1-alkenyl(phenyl)iodonium tetrafluoroborates (1) were synthesized stereoselectively in good yields by Michael-type addition of HF to 1-alkynyl(phenyl)iodonium tetrafluoroborates (2) with a commercially available HF reagent, hydrofluoric acid or Et3N-3HF. Pd-catalyzed cross-coupling reactions using 1 gave (Z)-2-fluoro-l-alkene derivatives in moderate yields. The treatment of 1 with KI in the presence of a catalytic amount of CuI gave (Z)-2-fluoro-1-iodo-1-alkenes (3). Pd-catalyzed cross-coupling reactions of 3 gave better results than that of 1, and a variety of (Z)-2-fluoro-l-alkene derivatives were synthesized in good yields. (c) 2006 Elsevier Ltd. All rights reserved.