The first nickel-catalyzed C–H arylations and alkenylations of imidazoles with phenol and enol derivatives are described.
第一个镍催化的咪唑与酚和烯醇衍生物的C-H芳基化和烯基化反应被描述了。
Ni-Catalyzed Aryl Sulfide Synthesis through an Aryl Exchange Reaction
作者:Ryota Isshiki、Miki B. Kurosawa、Kei Muto、Junichiro Yamaguchi
DOI:10.1021/jacs.1c04215
日期:2021.7.14
Ni-catalyzed aryl sulfide synthesis through an aryl exchange reaction between aryl sulfides and a variety of aryl electrophiles was developed. By using 2-pyridyl sulfide as a sulfide donor, this reaction achieved the synthesis of aryl sulfides without using odorous and toxic thiols. The use of a Ni/dcypt catalyst capable of cleaving and forming aryl–S bonds was important for the aryl exchange reaction
C–O/C–H Coupling of Polyfluoroarenes with Aryl Carbamates by Cooperative Ni/Cu Catalysis
作者:Yang Wang、Song-Bai Wu、Wen-Juan Shi、Zhang-Jie Shi
DOI:10.1021/acs.orglett.6b00819
日期:2016.6.3
C–O and C–H bonds is reported. The reaction conditions are simple, and only transition-metal catalysts and ligands are essential. Mechanistic studies indicated that Ni catalyst played an important role in activating C–O bond, while the Cu one in activating C–H Bond. The developed system proved to be effective for cross-coupling of terminal alkynes with aryl carbamates.
A practical, convenient, and general method for the difluoromethylation of tertiary amines, using diethyl bromodifluoromethylphosphonate and fluoride, is described. This commercially available phosphonate smoothly reacts with a fluoride ion to liberate a difluorocarbene intermediate that in the presence of a proton source and a tertiary amine generates the corresponding α-difluoromethylammonium compound
Certain 3-pyridiniumesters of mono- or di-lower alkyl carbamates having
申请人:Otsuka Pharmaceutical Co. Ltd.
公开号:US04661502A1
公开(公告)日:1987-04-28
Anticholinesterase and antihypercholesterolemic pyridine derivatives of the formula (I) ##STR1## are provided as well as processes for preparing same, and composition and methods of treatment employing such pyridine derivatives as the active drug components thereof.