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。
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。
Sulfonyl Azides as Precursors in Ligand-Free Palladium-Catalyzed Synthesis of Sulfonyl Carbamates and Sulfonyl Ureas and Synthesis of Sulfonamides
作者:Shiao Y. Chow、Marc Y. Stevens、Luke R. Odell
DOI:10.1021/acs.joc.5b02755
日期:2016.4.1
An efficientsynthesis of sulfonyl carbamates and sulfonyl ureasfrom sulfonyl azides employing a palladium-catalyzed carbonylation protocol has been developed. Using a two-chamber system, sulfonyl azides, PdCl2, and CO gas, released ex situ from Mo(CO)6, were assembled to generate sulfonyl isocyanates in situ, and alcohols and aryl amines were exploited as nucleophiles to afford a broad range of sulfonyl
Protonation of CH
<sub>3</sub>
N
<sub>3</sub>
and CF
<sub>3</sub>
N
<sub>3</sub>
in Superacids: Isolation and Structural Characterization of Long‐Lived Methyl‐ and Trifluoromethylamino Diazonium Ions
作者:Thomas Saal、Zsófia E. Blastik、Ralf Haiges、Archith Nirmalchandar、Amanda F. Baxter、Karl O. Christe、Monica Vasiliu、David A. Dixon、Petr Beier、G. K. Surya Prakash
DOI:10.1002/anie.202002750
日期:2020.7.20
methylamino diazonium cations [CH3N(H)N2]+ and [CF3N(H)N2]+ were prepared as their low‐temperature stable [AsF6]− salts by protonation of azidomethane and azidotrifluoromethane in superacidic systems. They were characterized by NMR and Raman spectroscopy. Unequivocal proof of the protonation site was obtained by the crystal structures of both salts, confirming the formation of alkylamino diazoniumions. The
Room‐Temperature‐Stable Diazoalkenes by Diazo Transfer from Azides: Pyridine‐Derived Diazoalkenes
作者:Justus Reitz、Patrick W. Antoni、Julian J. Holstein、Max M. Hansmann
DOI:10.1002/anie.202301486
日期:——
Room-temperature-stable diazoalkenes based on a pyridine backbone are accessible via dinitrogen transfer from azides. This fundamentally new substance class features the lowest C−C bond polarization of the few known stable diazoalkenes, therefore representing best the presentation R2C=C=N2. Photochemically triggered loss of N2 represents a new strategy to access C4 cumulenes.
基于吡啶主链的室温稳定的重氮烯烃可通过叠氮化物的二氮转移获得。这种全新的物质类别具有少数已知的稳定重氮烯烃中最低的 C−C 键极化,因此最好地呈现 R 2 C=C=N 2。光化学引发的 N 2损失代表了获取 C4 积烯的新策略。