InBr3-catalyzed intramolecular cyclization of 2-alkynylanilines leading to polysubstituted indole and its application to one-pot synthesis of an amino acid precursor
作者:Norio Sakai、Kimiyoshi Annaka、Takeo Konakahara
DOI:10.1016/j.tetlet.2005.11.121
日期:2006.1
We describe InBr3-catalyzed cyclization of 2-alkynylaniline derivatives having a variety of functional groups producing polysubstituted indoles. This methodology could be applied to the one-pot synthesis of an amino acid precursor by the addition of a catalytic amount of the indium salt, an imine, and TMSCl.
InBr<sub>3</sub>-Promoted Divergent Approach to Polysubstituted Indoles and Quinolines from 2-Ethynylanilines: Switch from an Intramolecular Cyclization to an Intermolecular Dimerization by a Type of Terminal Substituent Group
Use of a 2-ethynylaniline having an alkyl or aryl group on the terminal alkyne selectively produced a variety of polyfunctionalized indole derivatives in moderate to excellent yields via indium-catalyzed intramolecular cyclization of the corresponding alkynylaniline. In contrast, employment of a substrate with a trimethylsilyl group or with no substituent group on the terminal triple bond, exclusively
[3+2]-Annulation of platinum-bound azomethine ylides with distal CC bonds of N-allenamides
作者:Indradweep Chakrabarty、Suleman M. Inamdar、Manjur O. Akram、Amol B. Gade、Subhrashis Banerjee、Saibal Bera、Nitin T. Patil
DOI:10.1039/c6cc07874e
日期:——
A Pt-catalyzed, highly regioselective, reaction between N-allenamides and imino-alkynes leading to pyrrolo[1,2-a]indoles is described. This represents the firstexample of [3+2]-annulation of Pt-bound azomethine ylides with the distal C=C bond...
Synthesis of <sup>15</sup>N-labeled heterocycles <i>via</i> the cleavage of C–N bonds of anilines and glycine-<sup>15</sup>N
作者:Jiwen He、Xingguo Zhang、Qiuqin He、Hao Guo、Renhua Fan
DOI:10.1039/d1cc01734a
日期:——
A nitrogen replacement process of anilines by glycine-15N via the cleavage of two C–N bonds for the synthesis of 15N-labeled aromatic heterocycles was reported.
一种通过甘氨酸-15N替代苯胺的氮替换过程,通过断裂两个C-N键合成15N标记的芳香杂环化合物。
Gold-Catalyzed Bicyclic Annulations of <i>N</i>-(<i>o</i>-Alkynylphenyl)imines with α-Diazo Esters to Form 5,6-Dihydroindolo[2,1-<i>a</i>]isoquinolines
作者:Akshay Subhash Narode、Rai-Shung Liu
DOI:10.1021/acs.orglett.2c00450
日期:2022.3.25
One-pot synthesis of 5,6-dihydroindolo[2,1-a]isoquinolines from gold-catalyzedannulations between N-(o-alkynylphenyl)imines and α-diazo esters is described. This cascade reaction involves an initial attack of the diazo ester at the imine to form cis-aziridine, followed by stereoselective [3 + 3]-annulations with the tethered arylalkyne. We have employed this new catalysis to prepare one bioactive
描述了从N- ( o-炔基苯基) 亚胺和 α-重氮酯之间的金催化环化合成 5,6-二氢吲哚[2,1- a ] 异喹啉的一锅法。这种级联反应涉及重氮酯在亚胺上的初始攻击以形成顺式-氮丙啶,然后是立体选择性的 [3 + 3]-环化与束缚的芳基炔烃。我们采用这种新的催化剂制备了一种具有生物活性的 5,6-二氢吲哚[2,1- a ]异喹啉分子。