已经开发出一种用于对映选择性制备轴向手性 2-萘基吡咯的简单方法。该方案基于 Cu I /Fesulfos 催化的甲亚胺叶立德的高度对映选择性 1,3-偶极环加成,然后进行吡咯烷烷基化和吡咯烷氧化为吡咯。 DDQ/蓝光介导的芳构化过程中采用的温和条件促进了有效的中心到轴的手性转移,为相应的吡咯提供了高的对映选择性。
[reaction: see text] Silver fluoride and cinchonaalkaloidscatalyze the diastereo- and enantioselective 1,3-dipolar cycloaddition between azomethine ylides, generated from N-alkylideneglycine esters, and acrylates to give the corresponding endo-adducts. Azomethine ylides derivedfrom aromatic and aliphatic aldehydes react in a highly diastereoselective reaction with good yields and enantioselectivities
Bifunctional AgOAc-Catalyzed Asymmetric [3 + 2] Cycloaddition of Azomethine Ylides
作者:Wei Zeng、Yong-Gui Zhou
DOI:10.1021/ol0520370
日期:2005.10.1
[reaction: see text] A bifunctional AgOAc-catalyzed asymmetriccycloaddition of azomethineylides with electronic-deficient alkenes was developed using ferrocenyloxazoline-derived N,P ligands. The reactive metal-bound azomethineylide dipole is formed by the deprotonation with acetate, and extra base is not necessary. The reactions proceed with high enantioselectivity. This method provides an efficient
Highly Enantioselective Ag(I)-Catalyzed [3 + 2] Cycloaddition of Azomethine Ylides
作者:James M. Longmire、Bin Wang、Xumu Zhang
DOI:10.1021/ja025969x
日期:2002.11.1
A highly reactive Ag(I)-catalyzed [3 + 2] cycloaddition of azomethineylides is founded using AgOAc as the catalytic precursor and phosphines as ligands. Using a new bis-ferrocenyl amide phosphine (FAP) as the ligand, we found that high enantioselectivities (up to 97% ee) have been achieved in the [3 + 2] cycloaddition of azomethineylides. Up to four stereogenic centers can be established in this
Axially Chiral BINIM and Ni(II)-Catalyzed Highly Enantioselective 1,3-Dipolar Cycloaddition Reactions of Azomethine Ylides and <i>N</i>-Arylmaleimides
作者:Jing-Wen Shi、Mei-Xin Zhao、Zhi-Yu Lei、Min Shi
DOI:10.1021/jo701561d
日期:2008.1.1
[GRAPHICS]Axially chiral BINIM-Ni(II) complexes are effective catalysts in the asymmetric 1,3-dipolar cycloaddition reactions of azomethine ylides and N-arylmaleimides to give the corresponding adducts in good yields and up to 95% enantiomeric excesses.
GHOSH, M.;CHATTERJEE, B. G., J. INDIAN CHEM. SOC., 1985, 62, N 6, 457-459