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。
Syntheses, structures and catalytic coupling reactions of two tetrazolate-based coordination polymers
作者:Xin Xu、Pei-Jiang Liu、Ying-Hui Yu、Guang-Feng Hou、Jin-Sheng Gao、Dong-Sheng Ma
DOI:10.1016/j.poly.2015.04.012
日期:2015.7
Reactions of 5-(4-nitrophenyl)-1H-tetrazole (H(4-nptz)) and 5-(4-nitrobenzyl)-1H-tetrazole (H(4-nbtz)) with transition metals under solvothermal conditions yield two new coordination polymers, namely, [Cu-1(4-nptz)(CH3CN)](n) (1) and [Zn(4-nbtz)(2)](n) (2). Both of them were characterized by IR, thermogravimetric analysis, X-ray crystallography. Single crystal X-ray diffraction analysis reveals that 1 is of three-dimensional (3D) sqc184 type supramolecular framework, while 2 is of 3D sqc1 type supramolecular framework. In addition, solid state UV-Vis diffuse reflectance and photoluminescence properties of 1 and 2 are investigated. Furthermore, the catalytic properties for the coupling reaction of cc-amino acids and bromobenzene were also investigated. (C) 2015 Elsevier Ltd. All rights reserved.
US9534016B2
申请人:——
公开号:US9534016B2
公开(公告)日:2017-01-03
[EN] SOMATOSTATIN ANALOG AND USES THEREOF<br/>[FR] ANALOGUE DE LA SOMATOSTATINE ET SES UTILISATIONS
申请人:SOD CONSEILS RECH APPLIC
公开号:WO2009009035A1
公开(公告)日:2009-01-15
Claimed is a somatostatin agonist according to the formula: cyclo(4(OH)Pro-Phe- DTrp-Lys-Pty-Phe), or a pharmaceutically acceptable salt thereof, and uses thereof, which has interesting pharmaceutical properties.
Synthesis of enantiomerically enriched indolines and tetrahydroisoquinolines from (S)-amino acid-derived chiral carbocations: an easy access to (3S,4R)-demethoxy-3-isopropyl diclofensine
作者:Sudipta Kumar Manna、Gautam Panda
DOI:10.1039/c4ob00922c
日期:——
Enantiomerically enriched indolines and tetrahydroisoquinolines were synthesized within 5 min to 2 h in high yields from easily accessible (S)-amino acid derived chiral carbocations. The diastereoselective Friedel–Crafts reaction is promoted by a Lewis acid (AlCl3) offering trans-diastereoselectivity. The rate of the reaction and diastereoselectivity of the product are significantly influenced by steric