Development of a general copper-catalyzed vinylic Finkelstein reaction—application to the synthesis of the C1–C9 fragment of laingolide B
作者:Antoine Nitelet、Kévin Jouvin、Gwilherm Evano
DOI:10.1016/j.tet.2016.07.018
日期:2016.10
conditions compatible with a range of highly functionalized substrates. The potential of this vinylic halogen exchange reaction in total synthesis and medicinal chemistry was demonstrated by its successful use for the synthesis of the C1–C9 fragment of laingolide B and for the late-stage modification of drug-like molecules. The extension of this halogen exchange to the acetylenic and allenic Finkelstein
A General Copper-Catalyzed Vinylic Halogen Exchange Reaction
作者:Antoine Nitelet、Gwilherm Evano
DOI:10.1021/acs.orglett.6b00678
日期:2016.4.15
An efficient and general system for the halogen exchange reaction in alkenyl halides has been developed. Upon reaction with catalytic amounts of copper iodide and trans-N,N′-dimethylcyclohexane-1,2-diamine in the presence of tetramethylammonium chloride or bromide, a wide range of easily accessible alkenyl iodides can be smoothly transformed to their far less available chlorinated and brominated derivatives
Chromium-catalyzed olefination of arylaldehydes with haloforms assisted by 2,3,5,6-tetramethyl-<i>N</i>,<i>N</i>′-bis(trimethylsilyl)-1,4-dihydropyrazine
作者:Kohei Nishi、Hayato Tsurugi、Kazushi Mashima
DOI:10.1039/d2cc06104j
日期:——
Chromium-catalyzed olefination of arylaldehydes with haloforms was achieved using 2,3,5,6-tetramethyl-N,N′-bis(trimethylsilyl)-1,4-dihydropyrazine (1a) as an organic reducing agent, giving β-halostyrene derivatives in a trans-selective manner. The reaction required no metal powders, such as zinc and manganese, as reductants, thereby minimizing metal-based reaction waste.
Stereoselective Synthesis of <i>Z</i> Alkenyl Halides via Julia Olefination
作者:Marie-Eve Lebrun、Paul Le Marquand、Carl Berthelette
DOI:10.1021/jo052370h
日期:2006.3.1
Julia olefination between alpha-halomethyl sulfones and a variety of aldehydes afforded alkenyl halides in good to excellent yields with high E/Z stereo selectivities. Sulfones were readily prepared in two or three steps from commercially available reagents in good yields. Optimization revealed that the nature of the Z solvent, the base, and the additive were crucial to obtain the desired alkenyl halides.
Rhodium-Catalyzed Cross-Coupling of Alkenyl Halides with Arylboron Compounds
作者:Takanori Matsuda、Kentaro Suzuki、Norio Miura
DOI:10.1002/adsc.201300482
日期:2013.11.25
AbstractThe rhodium(I)‐catalyzed reaction between arylboronic esters and excess 1,2‐dichloroethene selectively afforded (2‐chlorovinyl)arenes. Double arylation yielding 1,2‐diarylethenes was observed when 1,2‐dibromoethene was reacted with 2.5 equivalents of arylboronic acid.magnified image