Expanded ring diaminocarbene palladium complexes: synthesis, structure, and Suzuki–Miyaura cross-coupling of heteroaryl chlorides in water
作者:Eugene L. Kolychev、Andrey F. Asachenko、Pavel B. Dzhevakov、Alexander A. Bush、Viacheslav V. Shuntikov、Victor N. Khrustalev、Mikhail S. Nechaev
DOI:10.1039/c3dt32860k
日期:——
and characterized structurally in the solid state. The influence of ring size (5, 6 or 7) and bulkiness of N-aryl substituents (Mes = 2,4,6-trimethylphenyl, or Dipp = 2,6-diisopropylphenyl) in carbenes on palladium catalysed Suzuki–Miyaura cross-coupling was revealed. Due to the unique stereoelectronic properties of expanded ring NHCs, a versatile, highly efficient green protocol of coupling of heteroaromatic
合成了一系列新型的六元和七元钯(NHC)Pd(cinn)Cl(cinn =肉桂基= 3-苯基烯丙基)的N-杂环卡宾(NHC)配合物,并在固态下进行了结构表征。卡宾烷中环大小(5、6或7)和N-芳基取代基的体积(Mes = 2,4,6-三甲基苯基,或Dipp = 2,6-二异丙基苯基)的体积对钯催化的Suzuki-Miyaura交叉偶联的影响被揭示了。由于扩展环NHC的独特立体电子性质,已开发了一种杂芳族氯化物和溴化物与硼酸偶联的通用,高效的绿色方案。联苯芳烃的定量收率很高水在空气中用作溶剂,使用低催化剂和相转移剂,并使用温和且对环境有益的碱NaHCO 3。