Generation of α-Imino Gold Carbenes through Gold-Catalyzed Intermolecular Reaction of Azides with Ynamides
摘要:
The generation of a-imino gold carbenes via gold-catalyzed intermolecular reaction of azides and ynamides is disclosed. This new methodology allows for highly regioselective access to valuable 2,aminoindoles and 3-amino-beta-carbolines in generally good to excellent yields. A mechanistic rationale for this tandem reaction, especially for the observed high regioselectivity, is supported by DFT calculations.
Subtle Structural Changes across the Boundary between A2AR/A2BR Dual Antagonism and A2BR Antagonism: A Novel Class of 2-Aminopyrimidine-Based Derivatives
Synthesis of tetrahydro-β-carbolines from 2-indolylmethyl azides and propargylic alcohols
作者:Haiting Yin、Qin Ma、Yushan Wang、Xiaoxia Gu、Zhijun Feng、Yunjun Wu、Ming Wang、Shaoyin Wang
DOI:10.1039/d1ra03022a
日期:——
A facile and efficient route to tetrahydro-β-carbolines from 2-indolylmethyl azides and propargylic alcohols via acid-catalyzed dehydrative annulation reactions is described. This reaction proceeds through a cascade sequence of Friedel–Crafts-type alkylation followed by intramolecular “Click” reaction, involving the formation of multiple chemical bonds in a single operation with excellent atom-economy
An unprecedented Lewisacidcatalyzed [4 + 3] cycloaddition reaction is described that provides a straightforward route to polycyclic products containing an imine-based indole azepine scaffold, starting from readily available internal tertiary alkynols and azides. This cycloaddition protocol provides efficient and atom-economical access to a new class of fascinating imine-containing products in satisfactory
Rapid and Mild Nucleophilic Substitution of a Highly Active (Indol-2-yl)methyl Electrophile in a Microflow Reactor
作者:Shinichiro Fuse、Yuma Matsuura、Naoto Yamasaki
DOI:10.1055/s-0043-1775370
日期:2024.9
frequently used chemical reaction in the pharmaceutical field. Developing protocols for the nucleophilic substitution of (indol-2-yl)methyl electrophiles is important for functionalizing indoles. There are few studies on the nucleophilic substitution at the 2′-position of the electrophiles without an electron-withdrawing group at the 1-position or substituents at the 2′- and 3-positions, where the existing
A small library of 25 triazole/tetrazole-based sulfonamides have been synthesized and further evaluated for their inhibitory activity against thrombin, trypsin, tryptase and chymase. In general, the triazole-based sulfonamides inhibited thrombin more efficiently than the tetrazole counterparts. Particularly, compound 26 showed strong thrombin inhibition (K-i = 880 nM) and significant selectivity against other human related serine proteases like trypsin (K-i = 729 mu M). Thrombin binding affinity of the same compound was determined by ITC and demonstrated that the binding of this new triazole-based scaffold is enthalpically driven, making it a good candidate for further development. (C) 2011 Elsevier Ltd. All rights reserved.