An azide-free strategy for the synthesis of N-2-aryl-1,2,3-triazoles via copper-catalyzed coupling of oxime acetates and aryldiazonium tetrafluoroborates is reported. With the magic p-methoxyphenyldiazonium tetrafluoroborate as the reaction partner, this copper-catalyzed system favored the desired single electron transfer process via N–O bond cleavage of oxime acetates, while the classic single electron transfer process via C–N₂ bond cleavage of aryldiazonium tetrafluoroborates was sufficiently inhibited. Significantly, various oxime acetates were suitable for this reaction, delivering the corresponding 4-substituted-N-2-aryl-1,2,3-triazoles and 4,5-disubstituted-N-2-aryl-1,2,3-triazoles in high yield. Primary mechanism studies indicated that this reaction involved a radical procedure. Furthermore, various novel and attractive tetraphenylethylene and carbazole based N-2-aryl-1,2,3-triazoles were synthesized smoothly.

中文翻译：

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铜催化的肟肟乙酸盐和芳基重氮盐的偶联：一种针对N -2-芳基-1,2,3-三唑的无叠氮化物策略

用于合成叠氮化物-自由策略Ñ -2-芳基-1,2,3-三唑经由报道肟乙酸酯和芳基重氮四氟硼酸盐的铜催化偶联。以神奇的对氟四氟硼酸对甲氧基苯基重氮作为反应伙伴，该铜催化体系偏向于通过肟肟的N–O键裂解实现所需的单电子转移过程，而经典的单电子通过芳基重氮酮通过C–N ₂键裂解进行单电子转移过程。四氟硼酸盐被充分抑制。明显地，各种肟肟适合于该反应，递送相应的4-取代的-N-2-芳基-1,2,3-三唑和4,5-二取代-N -2-芳基-1,2,3-三唑的产率很高。初步机理研究表明，该反应涉及一个基本步骤。此外，顺利地合成了各种新颖且有吸引力的基于四苯基乙烯和咔唑的N -2-芳基-1,2,3-三唑。