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
[EN] OXAZOLE DERIVATIVES AS INHIBITORS OF CYCLOOXYGENASE<br/>[FR] DERIVES D'OXAZOLE UTILISES COMME INHIBITEURS DE LA CYCLO-OXYGENASE
申请人:FUJISAWA PHARMACEUTICAL CO
公开号:WO2004065374A1
公开(公告)日:2004-08-05
A compound of the formula (I): wherein R1 is cycloalkyl, etc; R2 is (lower)alkoxy, etc; R3 is (lower)alkylene, etc; R4 is (lower)alkylene, etc; R5 is hydroxy, etc; X is '0', 'S', 'SO', or 'S02'; Y is 'CH' or 'N'; n is 0 or 1; or pharmaceutically acceptable salts thereof, which are useful as a medicament.
Accelerating Effect Induced by the Structure of α-Amino Acid in the Copper-Catalyzed Coupling Reaction of Aryl Halides with α-Amino Acids. Synthesis of Benzolactam-V8
作者:Dawei Ma、Yongda Zhang、Jiangchao Yao、Shihui Wu、Fenggang Tao
DOI:10.1021/ja981662f
日期:1998.12.1
hydrophilic groups. No racemization was observed in most cases of this coupling reaction. After some controlled experiments, a possible mechanism including the π-complex and the intramolecular substitution reaction is proposed. Based on this catalyzed reaction, a facile and stereoselective synthesis of benzolactam-V8, a new PKC activator, is achieved.
光学纯的 α-氨基酸与芳基卤化物的偶联产生对映纯的 N-芳基-α-氨基酸,在 CuI 的催化下保留构型。即使对于富电子的芳基卤化物,该反应也可以在比典型的 Ullmann 缩合低得多的温度下完成,这表明该反应中存在由 α-氨基酸结构诱导的加速效应。具有较大疏水基团的α-氨基酸产生较高的偶联产率,而具有较小疏水基团的α-氨基酸仅产生较低的产率,并且对于具有亲水基团的那些没有检测到偶联产物。在该偶联反应的大多数情况下未观察到外消旋化。经过一些对照实验,提出了一种可能的机制,包括 π 络合物和分子内取代反应。
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