Reagent-Controlled Stereoselectivity in Titanocene-Catalyzed Epoxide Openings: Reductions and Intermolecular Additions to ,-Unsaturated Carbonyl Compounds
作者:Andreas Gansäuer、Harald Bluhm、Björn Rinker、Sanjay Narayan、Michael Schick、Thorsten Lauterbach、Marianna Pierobon
DOI:10.1002/chem.200390056
日期:2003.1.20
The generation and addition reactions of metal bound radicals derived from normal and meso epoxides by electron transfer from titanocene(III) reagents is described. The control of enantioselectivity and diastereoselectivity of these transformations is investigated by variation of the ligands of the metal complex. The reaction can lead to unprecedented and highly selective reactions, in which synthetically
描述了通过钛茂(III)试剂的电子转移,由正和环氧化物形成的金属结合自由基的生成和加成反应。通过改变金属配合物的配体来研究这些转化的对映选择性和非对映选择性的控制。该反应可以导致空前的和高度选择性的反应,其中可以制备合成上有用的醇。提出的合成方法还规避了有毒金属的使用。另一个优点是没有还原性自由基链反应中通常观察到的两个官能团的损失。