The Synthesis of a New Class of Chiral Pincer Ligands and Their Applications in Enantioselective Catalytic Fluorinations and the Nozaki-Hiyama-Kishi Reaction
作者:Qing-Hai Deng、Hubert Wadepohl、Lutz H. Gade
DOI:10.1002/chem.201102375
日期:2011.12.23
ligands. These ligands were subsequently applied in the nickel(II)‐catalyzed enantioselective fluorination of oxindoles and β‐ketoesters to obtain the corresponding products with enantioselectivities of up to >99 % ee and high yields. Application of the chiral pincer ligands in the chromium‐catalyzed enantioselective Nozaki–Hiyama–Kishi reaction of aldehydes gave the corresponding alcohols with an optimal
从容易获得的邻苯二甲酰亚胺开始,分三步合成了一类新的手性三齿N-供体钳型配体,即双(恶唑啉基亚甲基)异吲哚啉(boxmi)。他们通过关键步骤Wittig反应与(三苯基膦基亚乙基)乙酸乙酯反应,得到了配体主链,将其与氨基醇缩合,然后环化获得相应的配体。这些配体随后被用于羟吲哚和β-酮酸酯的镍(II)催化的对映选择性氟化反应,以获得对映选择性高达> 99%ee的相应产物。 和高产量。手性钳式配体在铬催化的醛对映体Nozaki-Hiyama-Kishi反应中的应用使相应的醇具有93%的最佳对映体选择性。