Et<sub>2</sub>Zn-Catalyzed Intramolecular Hydroamination of Alkynyl Sulfonamides and the Related Tandem Cyclization/Addition Reaction
作者:Yan Yin、Wenying Ma、Zhuo Chai、Gang Zhao
DOI:10.1021/jo070681h
日期:2007.7.1
Intramolecularhydroamination of alkynyl amides was effected by a catalytic amount of Et2Zn (20 mol %) to form indole derivatives, and a tandem cyclization/nucleophilic addition procedure involving reaction of the indole zinc salt intermediate with acid chlorides or halides was developed to provide an efficient approach to C3-substituted indole derivatives when an excess of Et2Zn (120 mol %) was used
A Brønstedacid‐catalyzed annulation strategy has been developed to construct indeno[1,2‐c]quinolines. This tandem synthetic method proceeds through a sequential electrophilic addition followed by a Friedel–Crafts‐type reaction. A variety of tetracyclic compounds was obtained in moderate to high yields under mild reaction conditions in a short time.
已经开发出一种布伦斯台德酸催化环化策略来构建茚并[1,2- c ]喹啉。这种串联合成方法是通过依次进行亲电加成,然后进行Friedel-Crafts型反应来进行的。在短时间内在温和的反应条件下以中等至高收率获得了各种四环化合物。
An Iron‐Catalyzed Cascade Approach to Benzo[
<i>b</i>
]carbazole Synthesis Followed by 1,4‐Sulfonyl Migration
A simple and straightforward approach was developed to construct 5H‐benzo[b]carbazole derivatives by iron catalysis in a cascade sequence. The notable features of this work include an atom‐economical cascade sequence, unprecedented 1,4‐sulfonylmigration, tolerance of a variety of functional groups, good yields, and an economical catalytic system.
开发了一种简单而直接的方法,通过铁催化以级联顺序构建5 H-苯并[ b ]咔唑衍生物。这项工作的显着特征包括原子经济级联序列,前所未有的1,4-磺酰基迁移,对各种官能团的耐受性,良好的收率和经济的催化体系。
An efficient synthesis of indoles via a CuMgAl-LDH-catalyzed cyclization of 2-alkynylsulfonanilides
A highly efficient method for the synthesis of indoles has been successfully developed via a CuMgAl-LDH-catalyzed intramolecular annulation reaction of 2-alkynylsulfonanilides. This CuMgAl-LDH catalyst features facile preparation, recovery, and reuse at least seven times without a marked loss in the catalytic activity, as well as the unique dual activation. Moreover, the crystal structures and Hirshfeld
A Robust, Well-Defined Homogeneous Silver(I) Catalyst for Mild Intramolecular Hydroamination of 2-Ethynylanilines Leading to Indoles
作者:James McNulty、Kunal Keskar
DOI:10.1002/ejoc.201301368
日期:2014.3
A highly efficient, chemically stable and well-definedhomogeneoussilver(I) catalyst is reported for the room temperature, intramolecularhydroamination of 2-alkynylanilines leading to indole derivatives.