Efficient Enantioselective Synthesis of Functionalized Tetrahydropyrans by Ru-Catalyzed Asymmetric Ring-Opening Metathesis/Cross-Metathesis (AROM/CM)
作者:Dennis G. Gillingham、Osamu Kataoka、Steven B. Garber、Amir H. Hoveyda
DOI:10.1021/ja0458672
日期:2004.10.1
efficient method for enantioselective synthesis of highly functionalized pyrans (up to 98% ee) through Ru-catalyzed asymmetric ring-opening metathesis/cross-metathesis is described. Reactions are promoted by a recyclable chiral Ru-chloride or a new chiral Ru-iodide complex; the latter catalyst is less efficient but gives rise to significantly higher levels of enantioselectivity. Catalytic reactions can be
描述了一种通过 Ru 催化的不对称开环复分解/交叉复分解反应对映选择性合成高度官能化吡喃(高达 98% ee)的有效方法。反应由可回收的手性氯化钌或新的手性碘化钌配合物促进;后一种催化剂效率较低,但产生了显着更高水平的对映选择性。催化反应可以在未蒸馏的溶剂中进行,并且可以使用多种底物,包括那些含有仲醇和叔醇的底物。还介绍了突出催化方法效用的代表性区域选择性功能化。