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.
A highlyenantioselective three-component reaction of ynamides with carboxylic acids and 2,2′-diester aziridines has been realized by using a chiralN,N′-dioxide/Ho(OTf)3 complex as a Lewis acid catalyst. The process includes the formation of an α-acyloxyenamide intermediate through the addition of carboxylic acids to ynamides and the following enantioselective nucleophilic addition to in-situ-generated
Construction of thiazines and oxathianes via [3 + 3] annulation of N-tosylaziridinedicarboxylates and oxiranes with 1,4-dithiane-2,5-diol: application towards the synthesis of bioactive molecules
作者:Rohit Kumar Varshnaya、Prabal Banerjee
DOI:10.1039/c7ob00941k
日期:——
Lewis acid catalyzed [3+3] annulation of N tosylaziridinedicarboxylates and oxiranes with in situ generated mercaptoaldehyde for the synthesis of functionalized thiazine and oxathiane derivatives has been developed. Additionally, this method facilitate the derivatization of thiazine by detosylation and Krapcho monodecarboxylation.
Lewis Acid Catalyzed Annulation of Donor–Acceptor Cyclopropane and <i>N</i>-Tosylaziridinedicarboxylate: One-Step Synthesis of Functionalized 2<i>H</i>-Furo[2,3-<i>c</i>]pyrroles
作者:Asit Ghosh、Ashok Kumar Pandey、Prabal Banerjee
DOI:10.1021/acs.joc.5b00705
日期:2015.7.17
An efficient MgI2-catalyzed annulation between donor–acceptorcyclopropane and N-tosylaziridinedicarboxylate to accesshighly substituted 2H-furo[2,3-c]pyrrole bearing two rings and four stereocenters, including one quaternary carbon stereocenter, has been developed. This methodology can be used for the synthesis of biologically active compounds like IKM-159. This work also offers an insight into the
已经开发了一种有效的MgI 2催化的供体-受体环丙烷与N-甲苯磺酰基叠氮基二羧酸酯之间的环合反应,以访问带有两个环和四个立体中心(包括一个季碳立体中心)的高度取代的2 H-呋喃[2,3- c ]吡咯。该方法可用于合成诸如IKM-159的生物活性化合物。这项工作还提供了对环化过程机制的见解。