Modular Approach to New Chiral Monodentate Diamidophosphite Ligands. Application in Palladium-Catalyzed Asymmetric Hydrovinylation of Styrene
作者:Isabel Ayora、Rosa M. Ceder、Mauricio Espinel、Guillermo Muller、Mercè Rocamora、Marta Serrano
DOI:10.1021/om100946a
日期:2011.1.10
A new group of chiral monodentate diamidophosphite ligands (2 P−N/1 P−O bond) based on diazaphospholidine backbones derived from N,N′-dibenzylcyclohexane-1,2-diamine (7) and N,N′-dimethylcyclohexane-1,2-diamine (8), and diazaphosphepine backbones derived from N,N′-dimethyl-[1,1′-binaphthyl]-2,2′-diamine (9) and various chiral alkoxy groups (coming from phenylethanol a, borneol b, methyllactate c, allylic
基于由N,N'-二苄基环己烷-1,2-二胺(7)和N,N'-二甲基环己烷-1衍生的二氮杂膦烷骨架的一组新的手性单齿二氨基亚磷酸酯配体(2 P-N / 1 P-O键)N,N'-二甲基-[1,1'-联萘基] -2,2'-二胺(9)和各种手性烷氧基(来自苯乙醇a,冰片)的1,2-二胺(8)和二氮杂磷骨架b,乳酸甲酯c,烯丙醇d和甲醇e)已准备好。配体具有高度模块化的结构,非常适合合成小型文库。通过将纯对映体取代的二胺和纯对映体醇连续添加到三氯化磷中,可以很容易地完成制备。制备了相应的亚磷酰胺亚硒酸盐Se(7-9),并计算了J PSe以评估新配体的σ-供体能力。的反应〔钯(μ-Cl)的(η 3 -2-CH 3 C ^ 3 ħ 4)] 2与新的配位体diamidophosphite(7 - 9)导致单体烯丙基中性配合11 -13。由于钯原子周围的R-或S-几何形状,溶液中出现了两种异构体。的分子结构