A general method for copper-catalyzed deprotonative dimerization of arenes by employing oxygen as the terminal oxidant has been developed. Electron-rich and electron-poor heterocycles as well as electron-poor arenes are reactive. The method is tolerant to functionalities such as nitro, cyano, dialkylamino, and ester groups.
A general method for copper-catalyzed deprotonative dimerization of arenes by employing oxygen as the terminal oxidant has been developed. Electron-rich and electron-poor heterocycles as well as electron-poor arenes are reactive. The method is tolerant to functionalities such as nitro, cyano, dialkylamino, and ester groups.
Nickel, Manganese, Cobalt, and Iron-Catalyzed Deprotonative Arene Dimerization
A number of first-row transition metal salts catalyze deprotonative dimerization of acidic arenes. Under the atmosphere of oxygen, nickel, manganese, cobalt, and Iron chlorides have been shown to dimerize five- and six-membered ring heterocycles as well as electron-poor arenes. Both tetramethylpiperidide and dicyclohexylamide bases can be employed; however, the former afford slightly higher yields.
Metal-Free, Acid-Catalyzed <i>ortho</i>-Directed Synthesis of Anthranilic Acid Derivatives Using Carbodiimides
作者:Adrian S. Culf、Miroslava Čuperlović-Culf、Rodney J. Ouellette、Andreas Decken
DOI:10.1021/acs.orglett.5b01160
日期:2015.6.5
One-pot syntheses of fluorescent o-aminobenzoates, o-aminopyridine carboxylates, and a 2′-amino-[1,1′-biphenyl]-2-carboxylic acid are described. Carbodiimides are used as the source of the 2-amino function which inserts onto an aromatic ring using SNAr reaction conditions. This method proceeds regiospecifically with a range of 2-fluoroaromatic acids or esters bearing further aryl fluorine, trifluoromethyl