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
Iron-Catalyzed Reductive Vinylation of Tertiary Alkyl Oxalates with Activated Vinyl Halides
作者:Yang Ye、Haifeng Chen、Ken Yao、Hegui Gong
DOI:10.1021/acs.orglett.0c00561
日期:2020.3.6
of vinylated allcarbonquaternary centers via Fe-catalyzed cross-electrophile coupling of vinyl halides with tertiary alkyl methyl oxalates. The reaction displays excellent functional group tolerance and broad substrate scope, which allows cascade radical cyclization and vinylation to afford complex bicyclic and spiral structural motifs. The reaction proceeds via tertiary alkyl radicals, and the putative
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