Iodobenzene Diacetate/Tetrabutylammonium Iodide‐Induced Aziridination of<i>N</i>‐Tosylimines with Activated Methylene Compounds under Mild Conditions
作者:Renhua Fan、Yang Ye
DOI:10.1002/adsc.200800157
日期:2008.7.7
Aziridination of N-tosylimines with activatedmethylenecompoundsinduced by iodobenzenediacetate [PhI(OAc)2] and tetrabutylammonium bromide [Bu4NBr] afforded the corresponding 2,2-difunctionalized aziridines in good yields with the aid of a catalytic amount of base. The reaction is hypothesized to proceed via a tandem nucleophilic addition-oxidative cyclization pathway.
Lewis Acid-catalyzed [3 + 2]Cyclo-addition of Alkynes with<i>N</i>-Tosyl-aziridines via Carbon–Carbon Bond Cleavage: Synthesis of Highly Substituted 3-Pyrrolines
作者:Lei Li、Junliang Zhang
DOI:10.1021/ol202603e
日期:2011.11.18
A novel, efficient, and highly regioselective Lewis acid-catalyzed [3 + 2] cycloaddition of alkynes with azomethine ylides, which are easily obtained from N-tosylaziridines via C–C bond heterolysis at room temperature was developed. Moderate enantioselectivity (70% ee) can be achieved by the application of the commercially available chiral Pybox 7 as the ligand.
Synthesis of polycyclic spiroindolines <i>via</i> the cascade reaction of 3-(2-isocyanoethyl)indoles
作者:Haizhen Li、Jinyu Wu、Jianfeng Zheng、Wei-Dong Z. Li
DOI:10.1039/d1cc04576h
日期:——
Tandem reactions of the yttrium(iii) catalyzed ring-opening reaction of 2,2′-diester aziridines with 3-(2-isocyanoethyl)indoles and the subsequent Friedel–Crafts/Mannich/desulfonylation were reported. A series of polycyclic spiroindolines containing tetrahydro-β-carbolines were obtained in moderate to excellent yields (56–92%) in one step under mild reaction conditions. A possible catalytic mechanism
报道了钇 ( iii ) 催化 2,2'-二酯氮丙啶与 3-(2-异氰乙基) 吲哚的开环反应和随后的 Friedel-Crafts/Mannich/脱磺酰化反应的串联反应。在温和的反应条件下,一步获得了一系列含有四氢-β-咔啉的多环螺二氢吲哚,收率中等至极好(56-92%)。还提出了可能的催化机制。