A new and highly efficient Cu(I)/TF-BiphamPhos catalytic system exhibited excellent reactivity, enantio-/diastereoselectivity, and structural scope in asymmetric 1,3-dipolarcycloaddition of azomethineylides with 0.1-3 mol % of catalyst loading. The present methodology is the best result for asymmetric cycloaddition of azomethineylides, especially derived from amino esters other than glycinate in
Catalytic Asymmetric [3+2] Cycloaddition of Azomethine Ylides. Development of a Versatile Stepwise, Three-Component Reaction for Diversity-Oriented Synthesis
作者:Chuo Chen、Xiaodong Li、Stuart L. Schreiber
DOI:10.1021/ja036558z
日期:2003.8.1
We report a new catalyst system that should enhance the use of enantioselective 1,3-dipolar cycloadditions of azomethine ylides with electronic-deficient olefins in the divergent pathways of diversity-oriented synthesis (DOS). The underlying reaction is of considerable interest in DOS because its stereospecificity enables stereochemical diversification of up to four tetrahedral centers on pyrrolidine
我们报告了一种新的催化剂系统,该系统应该在多样性导向合成 (DOS) 的不同途径中增强对偶氮甲碱叶立德与缺电子烯烃的对映选择性 1,3-偶极环加成的使用。潜在的反应在 DOS 中引起了相当大的兴趣,因为它的立体定向性使吡咯烷环上多达四个四面体中心的立体化学多样化成为可能。这种新的催化剂系统扩展了偶氮甲碱叶立德环加成反应的范围和选择性,并且与用于 DOS 的单珠/单储备溶液技术平台中使用的试剂兼容。
Highly Enantioselective Copper(I)−Fesulphos-Catalyzed 1,3-Dipolar Cycloaddition of Azomethine Ylides
作者:Silvia Cabrera、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1021/ja0552186
日期:2005.11.30
The catalyst system formed by Cu(CH3CN)4ClO4 and the planar chiral P,S-ligand Fesulphos behaves as a very efficient chiral Lewis acid in the catalytic asymmetric 1,3-dipolarcycloaddition of azomethine ylides. This catalyst shows a remarkable reactivity at low catalyst loading (0.5-3 mol %), affording in good yields the endo adducts with exceptional levels of enantioselectivity (up to >99% ee). This
A novel Fe(II)/diaryl prolinol catalyzed asymmetric 1,3-dipolar cycloaddition of azomethine ylides with alkenes
作者:Haisheng Wu、Bo Wang、Hongqiang Liu、Lei Wang
DOI:10.1016/j.tet.2010.11.091
日期:2011.2
A novel Fe(II)/diaryl prolinol catalyzed asymmetric1,3-dipolarcycloaddition of azomethineylides with alkenes has been developed. In the presence of FeCl2 (10 mol %) and α,α-bis(3,5-bistrifluoromethylphenyl)prolinol L1 (10 mol %), [3+2] cycloaddition of azomethineylides with electronic-deficient olefins underwent smoothly in CH3CN at room temperature to generate the desired endo-adducts in moderate
Asymmetric [3+2] Cycloaddition of Azomethine Ylides Catalyzed by Silver(I) Triflate with a Chiral Bipyrrolidine-Derived Phosphine Ligand
作者:Zhen-Jiang Xu、Chi-Ming Che、Xin Gu、Vanessa Lo
DOI:10.1055/s-0032-1316779
日期:——
bipyrrolidine-derived phosphine ligands L1 and L2 were synthesized. The ‘AgOTf + L1’ protocol catalyzes the asymmetric [3+2] cycloaddition of azomethineylides with alkenes to give highly substituted pyrrolidines in good yields (up to 90%) with moderate to high diastereoselectivities (up to >19:1 dr) and enantioselectivities (up to 76%). Two novel chiral bipyrrolidine-derived phosphine ligands L1 and L2 were synthesized