Structure–reactivity relationships of l-proline derived spirolactams and α-methyl prolinamide organocatalysts in the asymmetric Michael addition reaction of aldehydes to nitroolefins
作者:Fintan Kelleher、Sinead Kelly、John Watts、Vickie McKee
DOI:10.1016/j.tet.2010.03.002
日期:2010.5
l-Proline derived spirolactams and α-methyl prolinamides act as organocatalysts for the asymmetric conjugate addition of aldehydes to nitroolefins in excellent yields, with good diastereoselectivity and enantioselectivity. Furthermore, low catalyst loadings (5 mol %) and a low aldehyde molar excess (1.5 M equiv) were achieved.
1-脯氨酸衍生的螺内酰胺和α-甲基脯氨酰胺可作为有机催化剂,以优异的收率,良好的非对映选择性和对映选择性将醛不对称共轭加成至硝基烯烃。此外,获得了低的催化剂负载量(5mol%)和低的醛摩尔过量(1.5M当量)。