cyclopentane/[PdCl(C3H5)]2 efficiently catalyses the Heck reaction of disubstituted alkenes such as methyl crotonate, ethyl cinnamate, methyl methacrylate or α-methylstyrene with a variety of aryl halides. In the presence of 1,2-disubstituted alkenes the stereoselectivities of the reactions strongly depend on the substituents of the alkenes. Selectivities up to 97% in favor of E-isomers can be obtained
顺式,顺式,顺式-1,2,3,4-四(二苯基膦甲基)环戊烷/ [PdCl(C 3 H 5)] 2有效催化巴豆酸甲酯,肉桂酸乙酯,甲基丙烯酸甲酯或α等二取代烯烃的Heck反应-甲基苯乙烯与各种芳基卤化物。在1,2-二取代的烯烃的存在下,反应的立体选择性强烈取决于烯烃的取代基。添加到巴豆酸甲酯中可以得到高达97%的选择性,有利于E-异构体。用1,1-二取代的烯烃获得甲基丙烯酸甲酯或α-甲基苯乙烯的产物混合物。
Pd-catalyzed ligand-free Suzuki reaction of β-substituted allylic halides with arylboronic acids in water
The metal- and photocatalyst-free synthesis of substituted allylarenes has been carried out under visiblelightdriven conditions. The process was based on the photogeneration of aryl radicals from arylazosulfones and their ensuing reaction with allyl sulfones. The developed procedure was very efficient when using substrates bearing electron-withdrawing groups, and allowed for the preparation of α-benzyl
Electroreductive Nickel-Catalyzed Allylation of Aryl Chlorides
作者:Xin Fu、Tingting Ran、Yu Zhou、Jie Liu
DOI:10.1021/acs.joc.2c02926
日期:2023.5.5
allylation viaelectrochemical promoted Ni-catalyzed reductive carbon–carbon bond formation. Readily available (hetero)aryl chlorides with a variety of allylic sulfones are used as electrophiles in this electroreductive coupling. This Ni-catalyzed modular approach displays generally good functional group tolerance and broad substrate scope. This reaction allows a series of allyliccompounds to be created
Selective arylation of 1,1-disubstituted olefins using a biphenyl-based phosphine in Heck coupling reactions
作者:Shirin Nadri、Mohammad Joshaghani、Ezzat Rafiee
DOI:10.1016/j.tetlet.2009.07.052
日期:2009.9
The biphenyl-based phosphine, 2-diphenylphosphino-2'-methylbiphenyl is an effective ligand for palladium-catalyzed terminal arylation of 1,1-disubstituted olefins with aryl bromides in DMF and K2CO3 as base. The yields of products are independent of the electronic properties of the aryl bromides, however, the nature of the olefin has a major effect. (C) 2009 Elsevier Ltd. All rights reserved.