A Zwitterionic Palladium(II) Complex as a Precatalyst for Neat-Water-Mediated Cross-Coupling Reactions of Heteroaryl, Benzyl, and Aryl Acid Chlorides with Organoboron Reagents
A zwitterionic palladium(II) complex has been found to be an efficient catalyst for Suzuki–Miyaura cross‐coupling reactions of aryl and heteroaryl organoboron reagents with various heteroaryl chlorides, aryl‐ and heteroarylmethyl chlorides, and aryl acid chlorides in neat water.
The heterocycle-containing diarylmethane synthesis from chloromethyl(hetero)arenes with (hetero)arylboron reagents was attained using the palladium/ether-imidazolium chloride system. This coupling process tolerated a diverse range of heteroaromatic moieties with sufficient catalytic activity to achieve the efficient synthesis of various diheteroarylmethanes in good to excellent yields.
Synthesis of Unsymmetrical Arylheteroarylmethanes by Direct “On Water” Cross-Coupling between Benzylic and Heteroaromatic Halides
作者:Valeria Krasovskaya、Arkady Krasovskiy、Bruce H. Lipshutz
DOI:10.1002/asia.201100153
日期:2011.8.1
Walking on water: Pharmacologically important unsymmetricalarylheteroarylmethanes are prepared by simple palladium‐catalyzed zinc‐mediated Negishi‐like cross‐couplings in good yields. This reaction tolerates various benzylic chlorides and heteroaromatic bromides “on water” and at room temperature.