Convenient synthesis of spiroindolenines from tryptamine-derived isocyanides and organic azides by cobalt catalysis in pure water
作者:Shuai Jiang、Wen-Bin Cao、Hai-Yan Li、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1039/d1gc00270h
日期:——
A Co-catalyzed coupling of 3-(2-isocyanoethyl)indoles with organic azides in pure water for accessing spiroindolenine derivatives was developed. This strategy features mild reaction conditions, high atom-economy, excellent yields, wide substrate scopes, and broad functional group tolerance. The products were obtained simply by sequential operation involving extraction, concentration, precipitation
Iridium(III)-Catalyzed Selective Sulfonamidation of<i>o</i>-Carborane with Sulfonyl Azide by Carboxylic Acid-Assisted B(4)-H Bond Activation
作者:Huanhuan Li、Fan Bai、Hong Yan、Changsheng Lu、Vladimir I. Bregadze
DOI:10.1002/ejoc.201601537
日期:2017.3.10
An IrIII‐catalyzed direct cage B(4)–H bond sulfonamidation with carboxylic acid assistance is reported. This reaction proceeds in the absence of both external oxidants and ligands, and shows high yields and good functional group tolerance. In particular, direct cage B(4)–H bond amination was achieved by using aryl and aliphatic azides as nitrenoid sources for the first time.
Co-Catalyzed Synthesis of <i>N</i>-Sulfonylcarboxamides from Carboxylic Acids and Sulfonyl Azides
作者:Yue Fang、Zheng-Yang Gu、Shun-Yi Wang、Jin-Ming Yang、Shun-Jun Ji
DOI:10.1021/acs.joc.8b01300
日期:2018.8.17
A Co-catalyzed effective synthesis of N-sulfonylcarboxamides from the reaction of carboxylicacids and organic azides in the presence of isocyanide has been developed. The protocol has the advantages of short time, low temperature, and being oxidant-free, which provides a new and simple approach for the synthesis of N-sulfonylcarboxamides in good to excellent yields with a broad substrate scope.
The Copper-Catalyzed Reaction of 2-(1-Hydroxyprop-2-yn-1-yl)phenols with Sulfonyl Azides Leading to C3-Unsubstituted <i>N</i>-Sulfonyl-2-iminocoumarins
作者:Yu Zhao、Zitong Zhou、Lvling Liu、Man Chen、Weiguang Yang、Qi Chen、Michael G. Gardiner、Martin G. Banwell
DOI:10.1021/acs.joc.1c00331
日期:2021.7.2
achieved by reacting 2-(1-hydroxyprop-2-yn-1-yl)phenols (e.g., 6a) with sulfonylazides (e.g., 7a). The cascade process involved likely starts with a copper-catalyzed alkyne–azide cycloaddition (CuAAC) reaction. This is followed by ring-opening of the resulting metalated triazole (with accompanying loss of nitrogen), reaction of the ensuing ketenimine with the pendant phenolic hydroxyl group, and finally