Stereoselective synthesis of fluoroalkenes via (Z)-2-fluoroalkenyliodonium salts
摘要:
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.
Selective Mono- and Dialkynylation of 1-Fluoro-2,2-diiodovinylarenes Using Pd-Catalyzed Decarboxylative Coupling Reactions
作者:Aravindan Jayaraman、Sunwoo Lee
DOI:10.1021/acs.orglett.9b02907
日期:2019.10.4
Palladium-catalyzed decarboxylative coupling reactions using alkynoic acids and 1-fluoro-2,2-diiodovinylarenes provide mono- and dialkynylfluoroalkenes with high selectivity. When the reaction was conducted using DBU/DMSO, the hydrodeiodinated monoalkynylfluoroalkene product was formed, whereas performing the reaction using Et3N/THF gave the dialkynylfluoroalkene product. Both reaction conditions gave high yields of
使用炔酸和1-氟-2,2-二碘乙烯基芳烃的钯催化的脱羧偶联反应可提供高选择性的单-和二-炔基氟烯烃。当使用DBU / DMSO进行反应时,形成了加氢碘化的单炔基氟代烯烃产物,而使用Et 3 N / THF进行反应则得到了二炔基氟代烯烃产物。两种反应条件均产生了高产率的带有氟原子的所需烯炔和乙炔产物。
Polymers as Reagents and Catalysts. XI. Stereospecific Iodofluorination of Alkenes in the Presence of Polymer Supported Hydrogen Fluoride
作者:Ana Gregorcic、Marko Zupan
DOI:10.1246/bcsj.60.3083
日期:1987.8
N-Iodosuccinimide reacted with phenyl substituted alkenes in the presence of insoluble polymer supported hydrogenfluoride, which was prepared by reaction of hydrogenfluoride with crosslinked poly(styrene-co-4-vinylpyridine) containing 40–45 mol% of 4-vinylpyridine, thus forming vicinal iodofluorides in high yields. Reactions proceeded with Markovnikov type regioselectivity, and in the case of (Z)-
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.