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.
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。
Gold/Lewis Acid Catalyzed Cycloisomerization/Diastereoselective [3 + 2] Cycloaddition Cascade: Synthesis of Diverse Nitrogen-Containing Spiro Heterocycles
A novel early and late transition-metal relay catalysis has been developed by combining a gold-catalyzedcycloisomerization and a Yb(OTf)3-catalyzed diastereoselective [3 + 2] cycloaddition with aziridines in a selective C–C bond cleavage mode. Various biologically significant complex nitrogen-containing spiro heterocycles were rapidly constructed from readily available starting materials under mild