在1-(邻乙炔基芳基)脲的金(I)催化的杂环化反应中揭示了π和双σ,π-金激活模式之间的竞争。描述了金络合物中各种配体对这些活化方式的选择的显着影响。阳离子[Au(IPr)] +(IPr = 2,6-双(二异丙基苯基)咪唑-2-2-亚烷基)络合物可干净地促进末端炔烃的π活化,而[Au(P t Bu 3)] +有利于中间σ ,π种。
ruthenium-catalyzed C2-hydroindolation of alkynes has been described. This transformation provides a rapid access to free (N–H) C2-syn-alkenylated indole derivatives with the assistance of copper(II) salts, in which the directing group is removed via a one-pot process.
Ruthenium‐Catalyzed Vinylene Carbonate Annulation by C−H/N−H Functionalizations: Step‐Economical Access to Indoles
作者:Yao Yu、Yang Wang、Bo Li、Yuqiang Tan、Huan Zhao、Zheyu Li、Chunran Zhang、Wenbo Ma
DOI:10.1002/adsc.202101466
日期:2022.2.15
A convenient and effective method of ruthenium-catalyzed C−H/N−H annulations using vinylene carbonate as oxidizing acetylene surrogate has been disclosed. This method is scalable and compatible with a wide range of functional groups, providing a step-economical access to indolesynthesis Preliminary mechanistic studies provided support for a reversible, acetate-assisted C−H ruthenation, along with
1,4,2-Dioxazol-5-ones are known to undergo decarboxylation under thermal conditions followed by Lossen’s rearrangement to give isocyanates. Described herein is the in situ trapping of the isocyanates by indoles to give indole-3-carboxamides in good to excellent yields.
NHC-Stabilized Gold(I) Complexes: Suitable Catalysts for 6-<i>exo</i>-dig Heterocyclization of 1-(<i>o</i>-Ethynylaryl)ureas
作者:Ana Gimeno、Mercedes Medio-Simón、Carmen Ramírez de Arellano、Gregorio Asensio、Ana B. Cuenca
DOI:10.1021/ol100595s
日期:2010.5.7
3-substituted 1-(o-ethynylaryl)ureas 1 selectively undergo either 6-exo-dig or 5-endo-dig cyclization (to give 4-methylene-3,4-quinazolin-2-ones 2 or indoles 3, respectively) depending on the choice of the metal, ligand, and reaction conditions. The best results (up to 96% yield) in the preparation of the hydroamination products 2 are achieved with the highly bulky NHC-stabilized cationic gold(I) complex
AlMe<sub>3</sub>-Mediated Regio- and Chemoselective Reactions of Indole with Carbamoyl Electrophiles
作者:A. Velavan、S. Sumathi、K. K. Balasubramanian
DOI:10.1002/ejoc.201300085
日期:2013.5
we report the regio- and chemoselectivereactions of indole with carbamoylelectrophiles in presence of AlMe3. Indole-3-carboxamide was prepared in one-step from a reaction of indole with tertiary carbamoylimidazole in the presence AlMe3. Under conditions for the formation of an aluminium ate complex, the reaction was diverted to the indole nitrogen. Secondary carbamoylelectrophiles in the presence