The synthesis of new oxazoline-containing bifunctional catalysts and their application in the addition of diethylzinc to aldehydes
作者:Vincent Coeffard、Helge Müller-Bunz、Patrick J. Guiry
DOI:10.1039/b822580j
日期:——
bifunctional catalysts is reported employing a microwave-assisted Buchwald–Hartwig aryl amination as the key step. Covalent attachment of 2-(o-aminophenyl)oxazolines and pyridine derivatives generated in good-to-high yields a series of ligands in two or three steps in which each part was altered independently to tune the activity and the selectivity of the corresponding catalysts. These catalysts prepared
据报道,采用微波辅助的Buchwald-Hartwig芳基胺化法作为关键步骤,可以直接制备新型的含恶唑啉的新型模块式双功能催化剂。2-(邻氨基苯基)恶唑啉和吡啶衍生物的共价连接以高到高的方式生成,分两步或三步产生一系列配体,其中每个部分独立地改变以调节活性和相应催化剂的选择性。这些原位制备的催化剂随后用于不对称加成二乙基锌生成各种醛,生成对映体选择性高达68%的相应醇。还提出了一种基于相关X射线晶体结构的过渡态模型来解释观察到的立体选择性。