Pd-Catalyzed Direct Cross-Coupling of Electron-Deficient Polyfluoroarenes with Heteroaromatic Tosylates
作者:Shilu Fan、Jie Yang、Xingang Zhang
DOI:10.1021/ol201706t
日期:2011.8.19
We report a Pd-catalyzed direct cross-coupling of electron-deficientpolyfluoroarenes with heteroaromatic tosylates. The notable features of this reaction are its high reaction efficiency, excellent chemoselectivity, operational simplicity, and mild reaction conditions. We have applied this protocol to prepare the semiconducting materials in a highly efficient manner.
The first example of the catalyst‐controlled selective synthesis of C2‐ and C3‐sulfonate‐ester‐substituted quinolines was developed by employing LaCl3 and chitosan@CuI catalysts, respectively. This protocol provides an expeditious route to an important class of quinoline derivatives frequently found in many biologically active compounds and features good practicality, high efficiency, and environmental
Reactions of N-oxides of lepidine (1a) and 4-methyl- (1b), 4-chloro- (1c) and 6-methoxyquinoline (1d) with tosyl chloride (1 eq) and triethylamine (ca. 10 eq) in a mixture of chloroform and water at room temperature gave the corresponding di (2-quinolyl) ethers (3a-d) and N-(2-quinolyl)-2-quinolones (4a-d). The efficiency of this type of reaction depends upon the nature and position of the substituents. Whereas the reaction of 1c with carbostyril under the same conditions gave small amounts of 4-chloro-2-tosyloxyquinoline (2c) and N-(4-chloro-2-quinolyl)-4-chloro-2-quinolone (4c), that of 1d afforded 6-methoxy-2-quinolyl 2'-quinolyl ether (15) and N-(6-methoxy-2-quinolyl)-2-quinolone (16) in 47 and 29% yields, respectively.