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
The Challenge of Palladium-Catalyzed Aromatic Azidocarbonylation: From Mechanistic and Catalyst Deactivation Studies to a Highly Efficient Process
作者:Fedor M. Miloserdov、Claire L. McMullin、Marta Martı́nez Belmonte、Jordi Benet-Buchholz、Vladimir I. Bakhmutov、Stuart A. Macgregor、Vladimir V. Grushin
DOI:10.1021/om401126m
日期:2014.2.10
Azidocarbonylation of iodoarenes with CO and NaN3, a novel Heck-type carbonylation reaction, readily occurs in an organic solvent–H2O biphasic system to furnish aroyl azides at room temperature and 1 atm. The reaction is catalyzed by Xantphos-Pd and exhibits high functional group tolerance. The catalyst deactivation product, [(Xantphos)PdI2], can be reduced in situ with PMHS to Pd(0) to regain catalytic
A metal-free PhI(OAc)2-mediated method for the synthesis of acyl azides through oxidative cleavage of 1,3-diketones is described. This method is shown to have a broad substrate scope, providing a useful tool for multiproduct synthesis in a single procedure. A possible reaction pathway is proposed based on mechanistic studies.
Aryl iodides smoothly react with NaN3 and CO in the presence of a Pd/Xantphos catalyst to give aroyl azides (ArCON3) in 75–92 % yield. The reaction occurs under mild reaction conditions (1 atm, 20–50 °C) and exhibits high functional‐group tolerance. (Xantphos=9,9‐dimethyl‐4,5‐bis(diphenylphosphino)xanthene)
Reaction of N-methylazomethine ylide with aroyl azides: Synthesis of imidazolidin-4-ones
作者:Evgeny M. Buev、Vladimir S. Moshkin、Vyacheslav Y. Sosnovskikh
DOI:10.1016/j.tetlet.2019.02.010
日期:2019.3
Aryl isocyanates generated in situ from aroyl azides react with N-methylazomethine ylide generated in situ from N-methylspiroanthraceneoxazolidine at 210 °C in a microwave reactor to form 3-arylimidazolidin-4-ones in 30–81% yield.