The reactivity of a series of N,N-dimethyl-2-iodoanilines bearing different chelating “arms” at the 3-position with Pd2(dba)3 has been explored. 3-[(Diphenylphosphino)methyl]-2-iodo-N,N-dimethylaniline (1) reacted with Pd2(dba)3 and PPh3 under aerobic conditions to give the OCP-pincer complex 4, which was formed by sequential C(sp3)–H activation/oxidation at the α-position of the aniline N atom. On the other hand, under similar reaction conditions, 3-[2-(dimethylamino)ethyl]-2-iodo-N,N-dimethylaniline (2) afforded the CCN-pincer complex 5, after a second C–H activation process at the formyl group of the initially formed OCN-pincer complex. In contrast, 2-iodo-3-(1H-1,2,4-triazol-1-ylmethyl)-N,N-dimethylaniline (3a) and 2-iodo-3-(pyrazol-1-ylmethyl)-N,N-dimethylaniline (3b) reacted with Pd2(dba)3 and PPh3, respectively, to give the 6-membered azapalladacycles 6a and 6b, in which the aniline nitrogen is merely a spectator substituent. Finally, treatment of iodide complex 6a with Tl(TfO) afforded the CN-bidentate cationic complex 8. Solid-state structures of palladium complexes 4, 5, and 8·CH2Cl2·3CH3OH·5H2O were determined by X-ray analysis.
对一系列在3位具有不同螯合“臂”的N,N-二甲基-
2-碘苯胺与Pd2(dba)3的反应性进行了研究。3-[(
二苯基膦基)甲基]-2-
碘-
N,N-二甲基苯胺(1)在有氧条件下与Pd2(dba)3和PPh3反应,生成了OCP-钳合剂复合物4,该复合物是通过在
苯胺氮原子α位的顺序C(sp3)–H活化/氧化反应形成的。另一方面,在类似反应条件下,3-[2-(二甲基
氨基)乙基]-2-
碘-
N,N-二甲基苯胺(2)在初步生成的OCN-钳合剂复合物的醛基经过第二次C–H活化过程后,生成了CCN-钳合剂复合物5。相比之下,2-
碘-3-(
1H-1,2,4-三唑-1-基甲基)-
N,N-二甲基苯胺(3a)和2-
碘-3-(
吡唑-1-基甲基)-
N,N-二甲基苯胺(3b)分别与Pd2(dba)3和PPh3反应,生成了6元氮
铂环复合物6a和6b,在这些复合物中,
苯胺氮仅是旁观性取代基。最后,用Tl(TfO)处理
碘化物复合物6a,得到了CN-双齿阳离子复合物8。通过X射线分析确定了
钯复合物4、5和8·
CH2Cl2·3CH3OH·5H2O的固态结构。