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-Unsaturatedketones are no longer the missing dipolarophiles in catalyticasymmetric 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。
Regioselective Hydrodehalogenation of Aromatic α‐ and β‐Halo carbonyl Compounds by CuI in Isopropanol
作者:Iram Parveen、Danish Khan、Naseem Ahmed
DOI:10.1002/ejoc.201801385
日期:2019.1.31
An efficient and regioselective hydrodehalogenation of aromatic α‐ and β‐halo carbonylcompounds has been developed using CuI in isopropanol under basic condition. This reaction system effectively reduces chloride, bromide and iodide groups and affords high yield (up to 97 %) as carbonylcompounds. The method is environmentally friendly and demonstrates excellent tolerance to a broad range of electronically