Reactions of 1-Substituted-polyfluoro-1-propenylp-Toluenesulfonates with Bifunctional Nitrogen Nucleophiles. A New Expedient Access to Monofluorinated Nitrogen Heterocycles
Ruthenium-Catalyzed<i>meta</i>-Selective C−H Mono- and Difluoromethylation of Arenes through<i>ortho</i>-Metalation Strategy
作者:Zhong-Yuan Li、Liang Li、Qi-Li Li、Kun Jing、Hui Xu、Guan-Wu Wang
DOI:10.1002/chem.201700354
日期:2017.3.8
Mechanistic studies indicate that a reaction pathway involving palladium‐initiated radical species is involved in the catalytic cycle. The new dual catalytic system consisting of compatible ruthenium(II) and palladium(0) complexes enables the key processes of C−H activation and mono‐/difluoromethyl‐radical formation to occur and achieves the meta‐selective functionalization efficiently. In addition, the present
Copper-mediated C–H cyanation of (hetero)arenes with ethyl (ethoxymethylene)cyanoacetate as a cyanating agent
作者:Chaorong Qi、Xiaohan Hu、Huanfeng Jiang
DOI:10.1039/c7cc03384b
日期:——
A copper-mediated direct C–H cyanation reaction of (hetero)arenes with ethyl (ethoxymethylene)cyanoacetate as a safe cyanating agent has been developed.
Provided is an acrylamide compound, which is useful for the promotion of platelet production from platelet progenitor cells such as megakaryocytes in vitro and represented by general formula [I]:wherein each symbol is as defined in the description.
Reactions of β-fluorovinamidinium salt with bifunctional hetero nucleophiles. A new synthetic route to fluorinated heterocycles
作者:Xifeng Shi、Takashi Ishihara、Hiroki Yamanaka、John T. Gupton
DOI:10.1016/0040-4039(95)00076-o
日期:1995.2
beta-Fluorovinamidinium salt (2), readily prepared from N-(2,3,3-trifluoro-1-propenyl)trimethylammonium iodide (1) and diethylamine, reacted with bifunctional hetero nucleophiles such as amidine and guanidine hydrochlorides in the presence of a base to afford regiospecifically monofluorinated pyrimidines 4 in good yields. The one-pot procedure starting from 1 was applicable for synthesizing heterocyclic compounds 4 in almost comparable yields.