36035-49-1Relevant articles and documents
Carbonylation of C?N Bonds in Tertiary Amines Catalyzed by Low-Valent Iron Catalysts
Nasr Allah, Tawfiq,Savourey, Solène,Berthet, Jean-Claude,Nicolas, Emmanuel,Cantat, Thibault
supporting information, p. 10884 - 10887 (2019/07/15)
The first iron catalysts able to promote the formal insertion of CO into the C?N bond of amines are reported. Using low-valent iron complexes, including K2[Fe(CO)4], amides are formed from aromatic and aliphatic amines, in the presence of an iodoalkane promoter. Inorganic Lewis acids, such as AlCl3 and Nd(OTf)3, have a positive influence on the catalytic activity of the iron salts, enabling the carbonylation at a low pressure of CO (6 to 8 bars).
Thermolysis and radiofluorination of diaryliodonium salts derived from anilines
Linstad, Ethan J.,Vāvere, Amy L.,Hu, Bao,Kempinger, Jayson J.,Snyder, Scott E.,DiMagno, Stephen G.
supporting information, p. 2246 - 2252 (2017/03/17)
Aniline-derived diaryliodonium salts were synthesized and functionalized in good to excellent yields by judicious utilization of electron-withdrawing protecting groups. This simple approach opens another route to radiolabeling amino arenes in relatively complex molecules, such as flutemetamol.
Oligo(N-aryl glycines): A new twist on structured peptoids
Shah, Neel H.,Butterfoss, Glenn L.,Nguyen, Khanh,Yoo, Barney,Bonneau, Richard,Rabenstein, Dallas L.,Kirshenbaum, Kent
experimental part, p. 16622 - 16632 (2009/04/14)
We explore strategies to enhance conformational ordering of N-substituted glycine peptoid oligomers. Peptoids bearing bulky N-alkyl side chains have previously been studied as important examples of biomimetic "foldamer" compounds, as they exhibit a capacity to populate helical structures featuring repeating cis-amide bonds. Substantial cis/trans amide bond isomerization, however, gives rise to conformational heterogeneity. Here, we report the use of N-aryl side chains as a tool to enforce the presence of trans-amide bonds, thereby engendering structural stability. Aniline derivatives and bromoacetic acid are used in the facile solid-phase synthesis of a diverse family of sequence-specific N-aryl glycine oligomers. Quantum mechanics calculations yield a detailed energy profile of the folding landscape and substantiate the hypothesis that the presence of anilide groups establishes a strong energetic preference for trans-amide bonds. X-ray crystallographic analysis and solution NMR studies verify this preference. Molecular modeling indicates that the linear oligomers can adopt helical structures resembling a polyproline type II helix. High resolution structures of macrocyclic oligomers incorporating both N-alkyl and N-aryl glycine units confirm the ability to direct the presence of trans-amide bonds specifically at N-aryl positions. These results are an important step in developing strategies for the rational de novo design of new structural motifs in biomimetic oligopeptoid systems.