Iridium(III)-Catalyzed Regioselective C7-Amination of N-Pivaloylindoles with Sulfonoazides
摘要:
Direct C7-amination of N-pivaloylindoles has been achieved using a combination of [Cp*IrCl2](2), AgNTf2, and AgOAc as the catalyst and sulfonoazides as the nitrogen source. The reaction proceeded at room temperature to 80 degrees C to afford 7-sulfonamidoindoles in good to excellent yields. The reaction is broadly applicable to the C7-amination of a wide variety of 3-, 4-, 5-, and 6-substituted N-pivaloylindoles with either alkyl or aryl sulfonoazides.
Synthesis of Sulfonyl Azides via Diazotransfer using an Imidazole-1-sulfonyl Azide Salt: Scope and <sup>15</sup>N NMR Labeling Experiments
作者:Marc Y. Stevens、Rajiv T. Sawant、Luke R. Odell
DOI:10.1021/jo500553q
日期:2014.6.6
Imidazole-1-sulfonyl azide hydrogen sulfate is presented as an efficient reagent for the synthesis of sulfonyl azides from primary sulfonamides. The described method is experimentally simple and high-yielding and does not require the addition of Cu salts. Furthermore, 15N NMR mechanistic studies show the reaction proceeds via a diazo transfer mechanism. Imidazole-1-sulfonyl azide hydrogen sulfate provides
咪唑-1-磺酰基叠氮化物硫酸氢盐被认为是由伯磺酰胺合成磺酰基叠氮化物的有效试剂。所描述的方法在实验上简单且产率高,并且不需要添加铜盐。此外,15 N NMR机理研究表明反应是通过重氮转移机理进行的。就冲击稳定性,成本和易于使用而言,咪唑-1-磺酰基叠氮化物硫酸氢盐与现有的重氮转移试剂相比具有明显的优势。
Iridium(III)-Catalyzed Selective and Mild C-H Amidation of Cyclic <i>N</i>
-Sulfonyl Ketimines with Organic Azides
作者:Manikantha Maraswami、Gang Chen、Teck-Peng Loh
DOI:10.1002/adsc.201700785
日期:2018.2.1
A general protocol for iridium catalyzed direct C−H amidation of cyclic N-sulfonyl ketimines using sulfonyl, acyl and arylazides as nitrogen source is reported herein. The reaction takes place at roomtemperature with acyl and arylazides, while an elevated temperature needed with sulfonylazides to furnish aminated sultams in excellent yields with complete chemo and regioselectivity, thus providing
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.