- An organocatalytic method for the synthesis of some novel xanthene derivatives by the intramolecular Friedel-Crafts reaction
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An efficient organocatalytic method for the synthesis of new substituted 9-arylxanthenes (2a-2u) starting from diarylcarbinol compounds with an arenoxy group (1a-1u) has been developed using the intramolecular Friedel-Crafts reaction. The substrates were
- Yildiz, Tülay,Kü?ük, Hatice Ba?pinar
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p. 16644 - 16649
(2017/03/24)
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- Metal-free oxidative coupling: Xanthone formation via direct annulation of 2-aryloxybenzaldehyde using tetrabutylammonium bromide as a promoter in aqueous medium
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A metal-free intramolecular annulation of 2-aryloxybenzaldehydes to xanthones is disclosed, which proceeds through the direct oxidative coupling of an aldehyde C-H bond and aromatic C-H bonds using tetrabutylammonium bromide (TBAB) as a promoter in aqueous medium. This strategy works smoothly in the presence of both electron-donating and electron-withdrawing groups, and displays good tolerance towards catalytically reactive substituents, thus promising further functionalizations of xanthone products.
- Rao, Honghua,Ma, Xinyi,Liu, Qianzi,Li, Zhongfeng,Cao, Shengli,Li, Chao-Jun
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supporting information
p. 2191 - 2196
(2013/10/01)
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- Ligand-free copper-catalyzed O-arylation of nitroarenes with phenols
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The first example of ligand-free copper-catalyzed O-arylation of nitroarenes with phenols was developed, achieving unsymmetrical diaryl ethers in moderate to excellent yields. This arylation proceeded smoothly without promotion of the ligands, and displayed great functional group compatibility. Thus, the method represents a new, facile, and cost-effective approach to access unsymmetrical diaryl ethers.
- Chen, Jiuxi,Wang, Xingyong,Zheng, Xingwang,Ding, Jinchang,Liu, Miaochang,Wu, Huayue
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supporting information
p. 8905 - 8907
(2012/10/29)
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- Palladium-catalyzed intramolecular C-H arylation of arenes using tosylates and mesylates as electrophiles
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This paper describes a method for the palladium catalyzed intramolecular C-H arylation using tosylates and mesylates as electrophiles. The transformation is efficient for the synthesis of various heterocyclic motifs including furans, carbazoles, indoles, and lactams. Additionally, a protocol for the one-pot sequential tosylation/arylation of phenol derivatives is presented.
- Nervig, Christine S.,Waller, Peter J.,Kalyani, Dipannita
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supporting information
p. 4838 - 4841,4
(2020/09/16)
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- The coupling of arylboronic acids with nitroarenes catalyzed by rhodium
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The coupling of arylboronic acids with electron-deficient nitroarenes was realized for the first time by using a rhodium(I) catalyst under an air atmosphere, achieving unsymmetrical diaryl ethers with yields ranging from poor to good. From a deuterium labeling experiment, the oxygen atom is derived from ambient water. The efficiency of this reaction was demonstrated by its compatibility with fluoro, bromo, chloro, and trifluoromethyl groups.
- Zheng, Xingwang,Ding, Jinchang,Chen, Jiuxi,Gao, Wenxiao,Liu, Miaochang,Wu, Huayue
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supporting information; experimental part
p. 1726 - 1729
(2011/05/06)
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- Cu-catalyzed arylation of phenols: Synthesis of sterically hindered and heteroaryl diaryl ethers
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"Chemical Equation Presentation" Cu-catalyzed O-arylation of phenols with aryl iodides and bromides can be performed under mild condition in DMSO/K3PO4 with use of picolinic acid as the ligand for copper. This method tolerates a variety of functional groups and is effective in the synthesis of hindered diaryl ethers and heteroaryl ethers.
- Maiti, Debabrata,Buchwald, Stephen L.
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supporting information; experimental part
p. 1791 - 1794
(2010/05/01)
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- Efficient palladium-catalyzed coupling reactions of aryl bromides and chlorides with phenols
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A convenient and general palladium-catalyzed coupling reaction of aryl bromides and chlorides with phenols was developed. Various functional groups such as nitriles, aldehydes, ketones and esters are well tolerated and the corresponding products are obtained in good to excellent yield.
- Hu, Tongjie,Schulz, Thomas,Torborg, Christian,Chen, Xiaorong,Wang, Jun,Beller, Matthias,Huang, Jun
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supporting information; scheme or table
p. 7330 - 7332
(2010/06/14)
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