Aryl Mesylates in Metal-Catalyzed Homocoupling and Cross-Coupling Reactions. 1. Functional Symmetrical Biaryls from Phenols via Nickel-Catalyzed Homocoupling of Their Mesylates
摘要:
Aryl sulfonates including mesylate derived from phenols are converted in high yields to biaryls by homocoupling in the presence of catalytic amounts of zero-valent nickel catalysts generated in situ. This reaction provides the most convenient method for the synthesis of many functional symmetrical biaryls and was applied to the preparation of 2,2'-, 3,3'-, and 4,4'-disubstituted biphenyls and other biaryls. The influence of the electronic and steric effects of substituents attached in the ortho, meta, and para positions of aryl sulfonates and the nature of the sulfonate leaving group on the yield of homocoupled product as well as their influence on the extent of various side reactions were investigated. In addition, the influence of the effects of the polarity and dryness of solvent, halide ion source and concentration, and ratio of catalyst and ligand to aryl sulfonate are discussed.
作者:G. R. Chalkley、D. J. Snodin、G. Stevens、M. C. Whiting
DOI:10.1039/j39700000682
日期:——
Aryloxysulphoxoniumsalts (tetrafluoroborates and hexafluorophosphates) have been prepared by the decomposition of arenediazonium salts in an excess of various compounds containing the sulphonyl grouping: sulphones and aryl esters, and alkylated amides of alkane- and arene-sulphonic acids and of sulphuric acid.
An Efficient Catalyst for Pd-Catalyzed Carbonylation of Aryl Arenesulfonates
作者:Chaoxian Cai、Nelo R. Rivera、Jaume Balsells、Rick R. Sidler、J. Christopher McWilliams、C. Scott Shultz、Yongkui Sun
DOI:10.1021/ol062208g
日期:2006.10.1
Aryl carboxylic esters were synthesized by Pd-catalyzed carbonylation of aryl p-fluorobenzenesulfonates or -tosylates. A unique Josiphos ligand was discovered through high-throughput catalyst screening, which was the key for the successful carbonylation of various substrates. This catalyst is effective and works well for both electron-rich and electron-poor aryl arenesulfonates. Isolated yields of up to 90% were obtained for aryl p-fluorobenzenesulfonates and -tosylates.
SULFUR-HETEROCYCLE EXCHANGE CHEMISTRY AND USES THEREOF
申请人:University of Virginia Patent Foundation
公开号:EP3924348A2
公开(公告)日:2021-12-22
[EN] SULFUR-HETEROCYCLE EXCHANGE CHEMISTRY AND USES THEREOF<br/>[FR] CHIMIE D'ÉCHANGE SOUFRE-HÉTÉROCYCLE ET UTILISATIONS ASSOCIÉES
申请人:UNIV VIRGINIA PATENT FOUNDATION
公开号:WO2020214336A2
公开(公告)日:2020-10-22
Sulfonyl-triazole compounds and related sulfonyl-heterocycle compounds are described. The compounds can be used to identify reactive nucleophilic amino acid residues, such as reactive tyrosines and reactive lysines, in proteins and to modify the activity of proteins with reactive nuclophilic amino acid residues via the formation of protein adducts comprising a fragment of the compounds. Methods are also described for screening the compounds to identify ligands of proteins comprising a reactive lysine or a reactive tyrosine.