Organocatalytic Enantio- and Diastereoselective Conjugate Addition to Nitroolefins: When β-Ketoamides Surpass β-Ketoesters
作者:Haiying Du、Jean Rodriguez、Xavier Bugaut、Thierry Constantieux
DOI:10.1002/chem.201402192
日期:2014.7.1
Our findings on the bifunctional squaramide‐catalyzed enantioselective conjugate addition of β‐ketoamides to nitroolefins are disclosed. It appears that simple acyclic methylene β‐ketoamides, unlike the extensively studied β‐ketoesters, afford the products in excellent diastereoselectivities, and maintain high yields and enantioselectivities. Moreover, competition and kinetic studies were conducted
披露了我们在双官能方酰胺催化的β-酮酰胺对硝基烯烃的对映选择性共轭加成反应中的发现。看起来,与广泛研究的β-酮酸酯不同,简单的无环亚甲基β-酮酰胺提供了极佳的非对映选择性,并保持了高收率和对映选择性。此外,进行竞争和动力学研究以合理化所观察到的反应性和选择性。高水平的非对映异构控制以及酰胺基团对后功能化的适应性,大大提高了转化的合成效用。