Bidentate phosphine-nitrogen ligands are disclosed which include a phosphine linked with a nitrogen heterocycle through a chiral ferrocene backbone. The ligands can include an imidazole or a dihydroimidazole linked to the ferrocene through the 2-position. Ligands can be prepared with or without additional chirality in the heterocycle. The ligands are useful for asymmetric catalysis, such as for palladium-catalyzed asymmetric allylation and ruthenium-catalyzed asymmetric transfer hydrogenation, affording products with high enantioselectivities.
双齿膦-氮
配体被披露,其中包括通过手性
二茂铁骨架将膦与氮杂环相连。这些
配体可以包括
咪唑或二氢
咪唑通过2位与
二茂铁相连。
配体可以在杂环中具有或不具有额外的手性。这些
配体对于不对称催化非常有用,例如
钯催化的不对称烯丙基化和
钌催化的不对称转移氢化,可以得到具有高对映选择性的产物。