PCN- and PCS-Pincer Palladium Complexes as Tandem Catalysts in Homoallylation Reactions
作者:Jie Li、Maxime Siegler、Martin Lutz、Anthony L. Spek、Robertus J. M. Klein Gebbink、Gerard van Koten
DOI:10.1002/adsc.201000204
日期:2010.10.4
were determined using X-ray diffraction and showed a typical pincer-type geometry. The catalytic activities of 1–3 in the homoallylation reactions of aldehydes and allyl(tributyl)stannane as well as of their corresponding cationic complexes 1a–3a in the tandem reaction of aldehydes or sulfonimines with allyl chlorides and hexamethyldistannane were investigated. It was found that the catalytic activities
新型PCN和PCS钳夹钯配合物2-(二甲氨基)甲基-5-甲氧基-6-(二苯基次膦氧基)苯基溴化钯(II)(1),2-(苯基亚氨基)-5-甲氧基-6-(二苯基次膦氧基)苯基钯(II)溴化物(2),2-(苯硫甲基)-5-甲氧基-6-(二苯基次膦氧基)苯基钯(II)溴化物(3),2-(苯硫基)甲基-5-甲氧基-6-(二苯基次膦氧基)苯基钯( II)通过使用一种以异香草醛为常见前体的灵活直接的合成途径,已合成了氯化物(4)(55%至95%的产率)。复合物的结构1,2和,4使用X射线衍射法测定了固态中的维生素C并显示出典型的钳型几何形状。研究了1 – 3在醛和烯丙基(三丁基)锡烷的均化反应中的催化活性,以及它们相应的阳离子配合物1a – 3a在醛或亚磺胺与烯丙基氯和六甲基二锡的串联反应中的催化活性。发现催化活性非常依赖于钳型配体中E-供体部分的组合。通常,PCS-钳子复合物3及其阳离子复合物3a优于