SCS-pincer palladium-catalyzed auto-tandem catalysis using dendritic catalysts in semi-permeable compartments
作者:Niels J. M. Pijnenburg、Harm P. Dijkstra、Gerard van Koten、Robertus J. M. Klein Gebbink
DOI:10.1039/c1dt10502g
日期:——
Novel monometallic and dendritic SCS-pincer palladium complexes 2, 3 and 4 have been synthesized in good yields (60–89%) and high purity (palladium loading >97%). These complexes were successfully used as catalysts in the stannylation of cinnamyl chloride with hexamethylditin and in the catalytic auto-tandem reaction consisting of this stannylation followed by an electrophilic addition with 4-nitrobenzaldehyde, showing similar reaction rates and selectivities for all complexes. Dendritic complex 4 has furthermore been used in the compartmentalized catalysis of single and auto-tandem reactions, allowing catalyst reuse for four consecutive runs.
新型单金属和树枝状SCS-钳状钯配合物2、3和4的合成收率良好(60-89%),纯度高(钯负载量>97%)。这些配合物成功用作肉桂酰氯与六甲基二锡的锡化反应催化剂,以及由锡化反应和4-硝基苯甲醛亲电加成反应组成的自动串联反应催化剂,所有配合物的反应速率和选择性相似。此外,树枝状配合物4还用于单反应和自动串联反应的分区催化,使催化剂能够连续使用四次。