Diasteroselective synthesis of oxazolidines and imidazolidines via the Lewis acid catalyzed C–C cleavage of aziridines
作者:Zheng Jiang、Jing Wang、Ping Lu、Yanguang Wang
DOI:10.1016/j.tet.2011.09.085
日期:2011.12
In this work, cis-2,5-disubstitutedoxazolidines were efficiently constructed via a regioselective C–C bond cleavage of N-tosylaziridine 2,2-dicaboxylates and a subsequent [3+2] cycloaddition with aromatic aldehydes in the presence of Zn(OTf)2. The reactions were highly diastereoselective to form oxazolidines in cis configurations. trans-2,5-Disubstituted imidazolidines were also diastereoselectively
Catalytic C6 Functionalization of 2,3-Disubstituted Indoles by Scandium Triflate
作者:Hua Liu、Chao Zheng、Shu-Li You
DOI:10.1021/jo402511b
日期:2014.2.7
We report herein an unprecedented direct catalytic C6 functionalization reaction of 2,3-disubstitutedindoles with various N–Ts aziridines catalyzed by Sc(OTf)3 under mild conditions. Mechanistic studies revealed that a kinetically favored but reversible formal [3 + 2] annulation occurs initially. The direct C6 functionalization, although having a relatively higher energetic barrier, delivers the thermodynamically
Fe(OTf)<sub>3</sub>Catalyzed Annulation of 2,3-Disubstituted Indoles with Aziridines
作者:Hua Liu、Chao Zheng、Shu-Li You
DOI:10.1002/cjoc.201400178
日期:2014.8
A Fe(OTf)3 catalyzed [3+2] annulation reaction between 2,3‐disubstituted indoles and N‐Ts aziridines is described herein. A series of hexahydropyrrolo[3,4‐b]indole derivatives bearing two consecutive quaternary carboncenters can be generated efficiently. The reaction features cheap catalyst, mild conditions and operational simplicity.
本文描述了Fe(OTf)3催化2,3-二取代的吲哚与N - Ts氮丙啶之间的[3 + 2]环化反应。可以高效地生成一系列带有两个连续的季碳中心的六氢吡咯并[3,4- b ]吲哚衍生物。该反应具有廉价的催化剂,温和的条件和操作简便的特点。