showed high efficiency for the couplingreactions of aminoacids and inactive aryl halides to give N-aryl aminoacids. Under the catalytic conditions, not only α-amino acids, but also β-, γ-, and δ-amino acids have been coupled with aryl chlorides in moderate to high yields; in the case of optically pure β-amino acids as substrates, the optical purities of the coupling products retained.
Room temperature N-arylation of amino acids and peptides using copper(<scp>i</scp>) and β-diketone
作者:Krishna K. Sharma、Swagat Sharma、Anurag Kudwal、Rahul Jain
DOI:10.1039/c5ob00288e
日期:——
A mild and efficient method for the N-arylation of zwitterionic amino acids, amino acid esters and peptides is described. The procedure provides the first roomtemperature synthesis of N-arylated amino acids and peptides using CuI as a catalyst, diketone as a ligand, and aryliodides as coupling partners. The method is equally applicable for using relatively inexpensive aryl bromides as coupling partners
A general, straightforward, and practicalaccess to multi-substituted chiral quinoxalin-2-ones has been achieved based on the copper(I) chloride-dimethylethylenediamine (DMEDA) catalyst system. With the use of 1 mol% copper(I) chloride, structurally diverse quinoxalin-2-ones were generated with high optical purity from readily available starting materials, 2-haloanilines and α-amino acids, in a one-pot
Microwave-promoted N-arylation of imidazole and amino acids in the presence of Cu2O and CuO in poly(ethylene glycol)
作者:A. A. Yakushev、A. D. Averin、E. Colacino、F. Lamaty、I. P. Beletskaya
DOI:10.1007/s11172-016-1442-8
日期:2016.5
Copper(I)-catalyzed N-arylation of imidazole with iodobenzene, its derivatives, and bromobenzene in poly(ethyleneglycol) under microwave irradiation was studied. The influence of the following factors on the yield of arylation product was investigated: the nature of the source of copper and ligand, type of poly(ethyleneglycol) (PEG) used, and substituents in iodoarene. An optimal catalytic system was selected:
Copper-catalyzed N-(hetero)arylation of amino acids in water
作者:Krishna K. Sharma、Meenakshi Mandloi、Neha Rai、Rahul Jain
DOI:10.1039/c6ra23364c
日期:——
An environmentally benign, mild, cost-effective and gram-scalable copper-catalyzed method for the N-(hetero)arylation of zwitterionic natural and unnatural amino acids using 2-isobutyrylcyclohexanone as a β-diketone ligand and aryl bromides as coupling partners in water for 50 min at 90 °C under microwave irradiation is reported. Electronically and sterically diverse aryl coupling partners were inserted