Polystyrene-supported dicyclohexylphenylphosphine adducts of amine- and phosphite-based palladacycles in the Suzuki coupling of aryl chlorides
作者:Robin B. Bedford、Simon J. Coles、Michael B. Hursthouse、V�ronique J. M. Scordia
DOI:10.1039/b415286g
日期:——
The polystyrene-immobilised palladacyclic complexes [Pd(TFA)(κ2-N,C-C6H4CH2NMe2)P(C6H4-4-PS)Cy2}] and [PdCl(κ2-P,C-P(OC6H2-2,4-tBu2)(OC6H3-2,4-tBu2)2}P(C6H4-4-PS)Cy2}]
(PS = polystyrene) and the homogeneous analogues [Pd(TFA)(κ2-N,C-C6H4CH2NMe2)(PPhCy2)] and PdCl(κ2-P,C-P(OC6H2-2,4-tBu2)(OC6H3-2,4-tBu2)2}(PPhCy2)] were synthesised and characterised. The X-ray structure of one of the homogeneous analogues, [Pd(TFA)(κ2-N,C-C6H4CH2NMe2)(PPhCy2)] was determined. All the complexes have been tested and show good activity in the Suzuki coupling of aryl chloride substrates. While the polystyrene-immobilised complexes are not recyclable, they are easily extracted and show low levels of palladium leaching.
聚苯乙烯固定化苍术络合物[Pd(TFA)(κ2-N,C-C6H4CH2NMe2)P(C6H4-4-PS)Cy2}]和[PdCl(κ2-P,C-P(OC6H2-2,4-tBu2)(OC6H3-2、4-tBu2)2}P(C6H4-4-PS)Cy2}](PS = 聚苯乙烯)以及均相类似物[Pd(TFA)(κ2-N,C-C6H4CH2NMe2)(PPhCy2)]和 PdCl(κ2-P,C-P(OC6H2-2,4-tBu2)(OC6H3-2,4-tBu2)2}(PPhCy2)]的合成和表征。确定了其中一种均相类似物 [Pd(TFA)(κ2-N,C-C6H4CH2NMe2)(PPhCy2)]的 X 射线结构。经测试,所有配合物在芳基氯底物的铃木偶联中都表现出良好的活性。虽然聚苯乙烯固定化络合物不可回收,但它们很容易提取,而且钯浸出率很低。