Xanthene-Phosphole Ligands: Synthesis, Coordination Chemistry, and Activity in the Palladium-Catalyzed Amine Allylation
作者:Guilhem Mora、Bernard Deschamps、Steven van Zutphen、Xavier F. Le Goff、Louis Ricard、Pascal Le Floch
DOI:10.1021/om061172t
日期:2007.4.1
5-triphenylphosphole. Both ligands (DPP-Xantphos 3 for the diphenyl derivative and DMP-Xantphos 4 for the dimethyl derivative) react with [Pd(allyl)Cl]2 to afford the corresponding cationic complexes 5Cl and 6Cl. Using AgOTf, stable triflate complexes 5OTf and 6OTf could be isolated. The chloride complexes, on the other hand, exhibit a limited stability in solution. The DPP-Xantphos derivative 5Cl eliminates allyl
两个新的呫吨磷杂衍生物,3和4,分别通过氰基的亲核取代在合成1- P -氰基-2,5- diphenylphosphole(1)和1- P -氰基-3,4- dimethylphosphole(2)由9,9'-二甲基the吨的4,5-二锂盐形成。为此,开发了一种新的合成方法,其允许从1,2,5-三苯基磷脂合成所需的1 - P-氰基-2,5-二苯基磷脂。两个配体(二苯基衍生物的DPP-Xantphos 3和二甲基衍生物的DMP-Xantphos 4)均与[Pd(烯丙基)Cl] 2反应得到相应的阳离子络合物5Cl和6Cl。使用AgOTf,可以分离稳定的三氟甲磺酸盐复合物5OTf和6OTf。另一方面,氯化物络合物在溶液中显示出有限的稳定性。DPP-Xantphos衍生物5Cl消除烯丙基氯,得到通式[Pd(3)] 2的二聚钯(0)配合物7,其中每个钯与相同配体的两个磷原子和一个双键配位第二配体的一