Enantioselective Diels–Alder Reactions of Enals and Alkylidene Diketones Catalyzed by N-Heterocyclic Carbenes
作者:Xinqiang Fang、Xingkuan Chen、Yonggui Robin Chi
DOI:10.1021/ol201917u
日期:2011.9.2
introduced to the α-position of chalcones, and the resulting alkylidene diketones showed new reactivities with enals under the catalysis of N-heterocyclic carbenes (NHCs). Selective activation of enals affords enolate equivalents that undergo highly enantioselective intermolecular Diels–Alder reactions with the alkylidene diketones. No products that might have resulted from typical homoenolate pathways were
一个吸电子基团被引入到查耳酮的α位,并且在N杂环卡宾(NHC)的催化下,所得的亚烷基二酮与烯醛显示出新的反应性。烯类的选择性活化提供了与亚烷基二酮发生高度对映选择性的分子间Diels-Alder反应的烯醇盐当量。没有观察到可能由典型的均烯酸酯途径产生的产物。