compounds. However, there is a need for efficient methods for their enantioselective construction. We report a method for the asymmetric 1,3-dipolar cycloaddition of diazoacetates or nitrile oxides with α-methylene lactams to prepare chiral spirocyclic heterocycles. The methodology is high yielding (up to 91% yield) and enantioselective (up to 89% ee) for a wide range of N-substituents and 6- and 7-membered
螺环支架是重要的基序,因为它们有可能对药物化合物产生有利的作用。然而,需要有效的方法来构建它们的对映选择性。我们报道了一种
重氮乙酸酯或氧化腈与α-亚甲基内酰胺进行不对称1,3-偶极环加成制备手性螺环杂环的方法。该方法对于多种N取代基以及 6 元环和 7 元环内酰胺底物具有高产率(高达 91% 产率)和对映选择性(高达 89% ee)。