Directed Catalytic Asymmetric Olefin Metathesis. Selectivity Control by Enoate and Ynoate Groups in Ru-Catalyzed Asymmetric Ring-Opening/Cross-Metathesis
作者:Russell E. Giudici、Amir H. Hoveyda
DOI:10.1021/ja070187v
日期:2007.4.1
concept in catalytic asymmetric olefin metathesis is introduced: a nonreacting enoate or ynoate group can be used to alter and significantly enhance the enantioselectivity. Catalytic asymmetric ring-opening/cross-metathesis (AROM/CM) processes proceed in ≤30% ee with non-styrenyl cross partners. However, with olefin partners bearing an enoate or ynoate group (1,6-diene or 1,6-enyne), catalytic AROM/CM
引入了催化不对称烯烃复分解的新概念:非反应性烯酸酯或炔酸酯基团可用于改变和显着提高对映选择性。催化不对称开环/交叉复分解 (AROM/CM) 过程在≤30% ee 的情况下与非苯乙烯基交叉伙伴进行。然而,由于烯烃伙伴带有烯酸酯或炔酸酯基团(1,6-二烯或 1,6-烯炔),催化 AROM/CM 可提供高达 98% ee 的所需产物,与与苯乙烯反应的对映选择性相反或脂肪族交叉伙伴。这种新方法首次将有效金属催化的 AROM/CM 的范围扩展到非苯乙烯基烯烃和环丙烯的反应,这是一组多样化且易于获得的底物,