Abstractmagnified imageUsing desyl chloride (2‐chloro‐1,2‐diphenylethanone) as the oxidant, the palladium‐catalyzed reaction of arylzinc with alkylindium reagents occurred smoothly in a highly selective manner to afford the products in 57–90% yields. Preliminary kinetic data indicated that alkylindium reagents were highly favored for transmetallation with the alkoxy‐palladium moiety.
Rh-Catalyzed Conjugate Addition of Arylzinc Chlorides to Thiochromones: A Highly Enantioselective Pathway for Accessing Chiral Thioflavanones
作者:Ling Meng、Ming Yu Jin、Jun Wang
DOI:10.1021/acs.orglett.6b02453
日期:2016.10.7
A highly efficient asymmetric synthesis of chiral thioflavanones is developed via conjugateaddition of arylzinc reagents to thiochromones using Rh(COD)Cl2/(R)-3,4,5-MeO-MeOBIPHEP catalyst. This method overcomes catalyst poisoning and substrate inertness and affords a series of chiral thioflavanones (2-arylthiochroman-4-ones) in good yields (up to 91% yield) with excellent ee values (up to 97% ee)
Electrophilic amination of organozinc reagents with acetone O-(2,4,6-trimethylphenylsulfonyl)oxime and O-methylhydroxylamine
作者:Ender Erdik、Tahir Daşkapan
DOI:10.1039/a906093f
日期:——
Reaction of diorganozincs and triorganozincates with acetone O-(2,4,6-trimethylphenylsulfonyl)oxime or O-methylhydroxylamine in the presence of CuCN provides a new one-flask method for electrophilic amination of organozinc reagents. Considering the lithium- or magnesium-to-zinc transmetallation, this method also extends the scope of electrophilic amination of organolithiums and Grignard reagents.
Synthesis of some ketones via nano-nickel oxide catalyzed acylation of arylzinc reagents; strategy involving the use of mixed (methyl)(aryl)zincs
作者:Pekel, Özgen ÖMÜR、Erdik, Ender、Kalkan, Melike
DOI:10.3906/kim-1712-28
日期:——
Nano-NiO catalyzed acylation of mixed (methyl)(aryl)zincs with aromatic acyl halides in THF at room temperature provides a new facile route for aryl-aroyl coupling. Among NiCl$_2}$.L$_2}$ and NiCl$_2}$.L (L = monodentate and bidentate phosphine ligand) catalysts, the lower catalyst loading of NiCl$_2}$ (dppf) may seem attractive; however, nano-NiO, being the lowest cost catalyst, is more favorable for aroylation of (methyl)(aryl)zincs. This procedure also provides a supplement to Cu and Pd catalyzed acylation of diorganozincs.
method and could easily be purified after isolation. The intermediate formation of the organozinc species is essential, as it prevents the formation of multiple substitution products. Important are also the reaction conditions: the usage of the proper solvent for the respective aromatic precursors and removal of the remaining salts by addition of a dioxane/pentane mixture. Depending on the solvent and
method from commercially available aromatic halides has been used for the synthesis of a series of donor/acceptor para-substituted biphenyls, DC6H4C6H4A, where D is an electron donor group and A an electron acceptor group, which are of interest as liquid crystal precursors and as having potential in non-linear optics. Biaryls in which the donor-phenyl moiety is replaced by a 2-furyl or 2-thienyl can