Asymmetric Olefin Isomerization of Butenolides via Proton Transfer Catalysis by an Organic Molecule
作者:Yongwei Wu、Ravi P. Singh、Li Deng
DOI:10.1021/ja205674x
日期:2011.8.17
general olefin isomerization was realized via biomimetic proton transfer catalysis with a new chiral organic catalyst. A broad range of mono- and disubstituted β,γ-unsaturated butenolides were transformed into the corresponding chiral α,β-unsaturated butenolides in high enantioselectivity and yield in the presence of as low as 0.5 mol % catalyst. Mechanistic studies have revealed the protonation as the
通过使用新型手性有机催化剂的仿生质子转移催化,实现了前所未有的对映选择性和通用烯烃异构化。在低至 0.5 mol% 的催化剂存在下,多种单取代和双取代的 β,γ-不饱和丁烯内酯以高对映选择性和产率转化为相应的手性 α,β-不饱和丁烯内酯。机理研究表明质子化是决定速率的步骤。