Catalytic Asymmetric 1,3-Dipolar Cycloaddition of Azomethine Ylides with α,β-Unsaturated Ketones
作者:Jorge Hernández-Toribio、Ramón Gómez Arrayás、Belén Martín-Matute、Juan C. Carretero
DOI:10.1021/ol802664m
日期:2009.1.15
α,β-Unsaturated ketones are no longer the missing dipolarophiles in catalytic asymmetric 1,3-dipolar cycloaddition of azomethine ylides. In the presence of CuI−Fesulphos complexes as catalysts (5 mol %), these substrates combine high reactivity, wide substitution tolerance, moderate to good endo/exo selectivities, and high enantiocontrol. The endo/exo-diastereoselectivity of the reaction is strongly
α,β-不饱和酮不再是偶氮甲亚胺催化的不对称1,3-偶极环加成反应中缺少的偶极亲和剂。在Cu I -Fesulphos络合物作为催化剂(5摩尔%)的存在下,这些底物结合了高反应活性,宽取代取代度,中等至良好的内/外选择性和高对映体控制性。反应的内/外-非对映体选择性强烈取决于烯酮部分的顺式或反式性质。