Asymmetric Synthesis of Acyclic Amines Through Zr- and Hf-Catalyzed Enantioselective Alkylzinc Reagents to Imines
作者:Laura?C. Akullian、James?R. Porter、John?F. Traverse、Marc?L. Snapper、Amir?H. Hoveyda
DOI:10.1002/adsc.200404319
日期:2005.2
available chiral amino acid-based ligands are used in metal-catalyzed additions of alkylzinc reagents to various aromatic and aliphatic imines; the desired amine products are formed efficiently and in high levels of optical purity. In cases where the more Lewis acidic Zr salts afford lower efficiency, Hf-based catalysts deliver significantly higher yields with similar enantioselectivities. Critical
易获得的基于手性氨基酸的配体用于烷基锌试剂向各种芳族和脂族亚胺的金属催化加成反应。有效地并以高水平的光学纯度形成所需的胺产物。在更多的路易斯酸性Zr盐提供较低的效率的情况下,基于Hf的催化剂具有相似的对映选择性,可显着提高收率。讨论了N-活化基团的关键结构特征以及最佳的手性配体。提出了一种机械工作模型,以合理化现有数据并用作预测工具。