The benzoxazole and benzothiazole moieties were used as innate directing groups for Pd(II)- and Ru(II)-catalyzed C–H arylation of the biorelevant heterocycles 2-arylbenzoxazole and 2-arylbenzothiazole with diverse iodoarenes; palladium and ruthenium catalysis could be used complementarily. The use of σ-donor ligands, such as N,N-dimethylacetamide in the Pd(II) catalytic cycle, and σ-donor/π-acceptor ligands, such as PPh₃ in the Ru(II) catalytic cycle, enhanced the arylation rate significantly and was governed by the C–H acidity of the C2-aryl ring of the 2-arylbenzoxazole or 2-arylbenzothiazole. These approaches have a broad substrate scope with respect to coupling partners, to accommodate electron-neutral, electron-rich, as well as electron-deficient iodoarenes; the C2-aryl unit of the 2-arylbenzoxazole or 2-arylbenzothiazole exhibited a high degree of site selectivity at the ortho C–H position, affording only monoarylated derivatives in decent yields; the reactions are functional-group-tolerant and applicable to gram-scale production.

苯并恶唑和苯并噻唑部分用作 Pd(II) 和 Ru(II) 催化的生物相关杂环 2-芳基苯并恶唑和 2-芳基苯并噻唑与多种碘芳烃的 C-H 芳基化的固有导向基团；钯和钌催化可以互补使用。使用σ-供体配体（例如Pd（II）催化循环中的N，N-二甲基乙酰胺）和σ-供体/π-受体配体（例如Ru（II）催化循环中的PPh ₃ ）增强了芳基化速率显着，并且受2-芳基苯并恶唑或2-芳基苯并噻唑的C2-芳基环的C-H酸度控制。这些方法对于偶联配偶体而言具有广泛的底物范围，以适应电子中性、富电子以及缺电子的碘芳烃；2-芳基苯并恶唑或2-芳基苯并噻唑的C2-芳基单元在邻位C -H位置表现出高度的位点选择性，仅以良好的产率提供单芳基化衍生物；该反应具有官能团耐受性，适用于克级生产。