Platinum-Catalyzed Enantioselective Tandem Alkylation/Arylation of Primary Phosphines. Asymmetric Synthesis of P-Stereogenic 1-Phosphaacenaphthenes
作者:Brian J. Anderson、Marites A. Guino-o、David S. Glueck、James A. Golen、Antonio G. DiPasquale、Louise M. Liable-Sands、Arnold L. Rheingold
DOI:10.1021/ol801616s
日期:2008.10.16
Enantioselective tandem alkylation/arylation of primary phosphines with 1-bromo-8-chloromethylnaphthalene catalyzed by Pt(DuPhos) complexes gave P-stereogenic 1-phosphaacenaphthenes (AcePhos) in up to 74% ee. Diastereoselective formation of four P-C bonds in one pot with bis(primary) phosphines gave C2-symmetric diphosphines, including the o-phenylene derivative DuAcePhos, for which the rac isomer
Pt(DuPhos)配合物催化的1-膦-8-氯甲基萘与初级膦的对映选择性串联烷基化/芳基化反应产生的P-立体异构1-膦ac啶酮(AcePhos)的电子收率高达74%。在一个锅中与双(伯)膦非对映选择性地形成四个PC键,得到C2对称的二膦,包括邻苯撑衍生物DuAcePhos,其外消旋异构体具有高对映选择性。这些反应似乎是通过不寻常的金属介导的亲核芳香取代途径进行的,产生了一类新的杂环化合物,在不对称催化中具有潜在的应用前景。