Dual nickel- and photoredox-catalyzed reductive cross-coupling of aryl vinyl halides and unactivated tertiary alkyl bromides
作者:Weijie Yu、Long Chen、Jiasi Tao、Tao Wang、Junkai Fu
DOI:10.1039/c9cc00768g
日期:——
A novel reductive cross-coupling of arylvinylhalides and unactivated tertiary alkyl bromides has been realized via photoredox/nickel dual catalysis to produce vinyl arene derivatives bearing all-carbon quaternary centers with excellent E-selectivity. A stoichiometric metal reductant could be avoided by employing commercially available N,N,N′,N′-tetramethylethylenediamine (TMEDA) as the terminal reductant
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
Nickel‐Catalyzed, Regio‐ and Enantioselective Benzylic Alkenylation of Olefins with Alkenyl Bromide
作者:Jiandong Liu、Hegui Gong、Shaolin Zhu
DOI:10.1002/anie.202012614
日期:2021.2.19
A NiH‐catalyzed migratory hydroalkenylation reaction of olefins with alkenyl bromides has been developed, affording benzylic alkenylation products with high yields and excellent chemoselectivity. The mild conditions of the reaction preclude olefinic products from undergoing further isomerization or subsequent alkenylation. Catalytic enantioselective hydroalkenylation of styrenes was achieved by using
Lithium Binaphtholate-Catalyzed Enantioselective Enyne Addition to Ketones: Access to Enynylated Tertiary Alcohols
作者:Hua Cai、Jing Nie、Yan Zheng、Jun-An Ma
DOI:10.1021/jo5005839
日期:2014.6.20
A new catalyticenantioselective enyne addition to ketones has been developed. In the presence of chiral lithium binaphtholate, the addition reaction proceeded smoothly to produce a series of enynylated tertiary alcohols in up to 96% yield and 94% enantiomeric excess. Convenient transformation of the adduct via Pauson–Khand cycloaddition reaction afforded the bicyclic product without detectable loss
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.