Catalytic Alkyne Arylation Using Traceless Directing Groups
作者:Jung‐Woo Park、Bubwoong Kang、Vy M. Dong
DOI:10.1002/anie.201804955
日期:2018.10.8
to generate enamines, which are then hydrolyzed to either α‐arylphenones or α,α‐diarylketones. This Pd‐catalyzed method overcomes established known pathways to enable the use of amines as tracelessdirectinggroups for C−C bond formation.
Ylide-Functionalized Phosphine (YPhos)–Palladium Catalysts: Selective Monoarylation of Alkyl Ketones with Aryl Chlorides
作者:Xiao-Qiang Hu、Dominik Lichte、Ilja Rodstein、Philip Weber、Ann-Katrin Seitz、Thorsten Scherpf、Viktoria H. Gessner、Lukas J. Gooßen
DOI:10.1021/acs.orglett.9b02830
日期:2019.9.20
phosphine (YPhos) ligands allow the palladium-catalyzed α-arylation of alkylketones with aryl chlorides with record setting activity. Using a cyclohexyl-substituted YPhos ligand, a wide range of challenging ketone substrates was efficiently and selectively monoarylated under mild conditions. A newly designed YPhos ligand bearing tert-butyl groups on the coordinating phosphorus atom is already active
Nickel-Catalyzed Transformation of Aryl 2-Pyridyl Ethers via Cleavage of the Carbon–Oxygen Bond: Synthesis of Mono-α-arylated Ketones
作者:Zhong-Xia Wang、Jing Li
DOI:10.1055/s-0037-1609963
日期:2018.8
aryl 2-pyridyl ethers with propiophenone and acetophenone derivatives via C–OPy bond cleavage is performed in the presence of t-BuOLi to give mono-α-arylated ketones in moderate yields. The method is suitable for electron-rich and electron-poor ethers as well as heteroaryl ethers and tolerates a range of active functional groups. The nickel/IPr-catalyzed reaction of aryl 2-pyridyl ethers with propiophenone
Formation of exceptional monomeric YPhos–PdCl<sub>2</sub> complexes with high activities in coupling reactions
作者:Ilja Rodstein、Leif Kelling、Julian Löffler、Thorsten Scherpf、Abir Sarbajna、Diego M. Andrada、Viktoria H. Gessner
DOI:10.1039/d2sc04523k
日期:——
showed that these bonds are both dative interactions with the stronger interaction originating from the electron-rich phosphine donor. This bonding mode leads to a remarkable stability even towards air and moisture. Nonetheless, the complexes readily form monoligated LPd(0) complexes and thus the active palladium(0) species in coupling reactions. Accordingly, the YPhos–PdCl2 complexes serve as highly
Process for the stereoselective synthesis of the E isomer of aryl alkyl oximes
申请人:RHONE-POULENC INC.
公开号:EP0009865A1
公开(公告)日:1980-04-16
Mixtures of the E and Z isomers of aryl alkyl oximes are converted to 98% or greater E isomer by a process comprising treating a solution of a mixture of E and Z isomers in an organic solvent with a protic or Lewis acid, under anhydrous conditions, to precipitate >98% pure E isomer of an immonium complex and neutralizing the precipitate with an excess of dilute organic/inorganic base, such as Na2CO3 or NaHCO3. The E isomer of the ketoxime is precursor for highly insecticidal ketoximinoethers.
芳基烷基肟的 E 异构体和 Z 异构体混合物可通过以下工艺转化为 98% 或更高的 E 异构体:在无水条件下,用质酸或路易斯酸处理 E 异构体和 Z 异构体混合物在有机溶剂中的溶液,沉淀出大于 98% 的纯 E 异构体铵络合物,并用过量的稀有机/无机碱(如 Na2CO3 或 NaHCO3)中和沉淀物。酮肟的 E 异构体是高杀虫性酮肟醚的前体。