Formation of Quaternary Stereogenic Centers by Copper-Catalyzed Asymmetric Conjugate Addition Reactions of Alkenylaluminums to Trisubstituted Enones
作者:Daniel Müller、Alexandre Alexakis
DOI:10.1002/chem.201302856
日期:2013.11.4
undergo asymmetric copper‐catalyzedconjugateaddition (ACA) to β‐substituted enones allowing the formation of stereogenic all‐carbon quaternary centers. Phosphinamine–copper complexes proved to be particularly active and selective compared with phosphoramidite ligands. After extensive optimization, high enantioselectivities (up to 96 % ee) were obtained for the addition of alkenylalanes to β‐substituted
Preparation of Vinyl Arenes by Nickel-Catalyzed Reductive Coupling of Aryl Halides with Vinyl Bromides
作者:Jiandong Liu、Qinghua Ren、Xinghua Zhang、Hegui Gong
DOI:10.1002/anie.201607959
日期:2016.12.12
This work emphasizes the synthesis of substituted vinyl arenes by reductive coupling of arylhalides with vinyl bromides under mild and easy‐to‐operate nickel‐catalyzed reaction conditions. A broad range of arylhalides, including heteroaromatics, and vinyl bromides were employed to yielding products in moderate to excellent yields with high functional‐group tolerance. The nickel‐catalytic system displays
A simple and mild method for the conversion of varieties of alpha,beta-unsaturated carboxylic acids to the corresponding bromoalkenes using diacetoxyiodobenzene (IBD) in combination with tetraethyl-ammonium bromide (TEAB) at room temperature is discussed. Advantages of this system are short reaction time, easy work up and gave good to excellent yields.
Stereoselective Synthesis of Vinyl Iodides through Copper(I)-Catalyzed Finkelstein-Type Halide-Exchange Reaction
作者:Xiujuan Feng、Haixia Zhang、Wenbo Lu、Yoshinori Yamamoto、Abdulrahman Almansour、Natarajan Arumugam、Raju Kumar、Ming Bao
DOI:10.1055/s-0036-1588988
日期:2017.6
efficient method for the stereoselectivesynthesis of vinyl iodides is described. The reactions of vinyl bromides with potassium iodide proceed smoothly in the presence of a copper catalyst under mild reaction conditions to produce the corresponding vinyl iodides stereospecifically and in satisfactory to excellent yields. An efficient method for the stereoselectivesynthesis of vinyl iodides is described
Ni-catalyzed reductive coupling of α-halocarbonyl derivatives with vinyl bromides
作者:Canbin Qiu、Ken Yao、Xinghua Zhang、Hegui Gong
DOI:10.1039/c6ob02269c
日期:——
This work describes the vinylation of α-halo carbonyl compounds with vinylbromides under Ni-catalyzed reductive coupling conditions. While aryl-conjugated vinylbromides entail pyridine as the sole labile ligand, the alkyl-substituted vinylbromides require both bipyridine and pyridine as the co-ligands.