Chemoselective Copper-Catalyzed Ullmann-Type Coupling of Oxazolidinones with Bromoiodoarenes
作者:Sean M. Kelly、Chong Han、Laura Tung、Francis Gosselin
DOI:10.1021/acs.orglett.7b01304
日期:2017.6.2
We describe the highly selective copper-catalyzed Ullmann-type coupling of bromoiodoarenes with oxazolidinones. 3,4,7,8-Tetramethyl-1,10-phenanthroline (Me4Phen) was identified as an optimal ligand promoting the desired C–N bond formation, while minimizing the competitive bromo–iodo exchange pathway that leads to formation of iodo-substituted and bis-coupled side products. The developed method is highly
我们描述了高选择性铜催化的溴碘代芳烃与恶唑烷酮的乌尔曼型偶联。3,4,7,8-四甲基-1,10-菲咯啉(Me 4 Phen)被确定为促进所需C–N键形成的最佳配体,同时最小化了导致碘形成的竞争性溴-碘交换路径-取代和双偶联副产物。所开发的方法具有很高的选择性,分离出的产物中溴与碘取代的化合物的比率> 98:2。