Trimethoxybenzene- and trimethylbenzene-based compounds bearing imidazole, indole and pyrrole groups as recognition units: synthesis and evaluation of the binding properties towards carbohydrates
CO 2插入到由三(β-二酮亚胺)环烷连接的三(μ-氢化)三铁(II)簇中被证明通过空间位阻平衡CO 2方法和氢化物可及性。对于甲氧基与氢化物供体 (Fe 3 H 3 L 2 , 4 )的口袋接壤的络合物,该反应的时间分辨 NMR 和紫外可见光谱导致活化势垒降低和动力学同位素效应增加,这与减少空间。对于乙基同系物 Fe 3 H 3 L 1 ( 2 ),没有发现反应速率与反应溶剂或添加的路易斯酸之间存在相关性,这意味着 CO 2与机制中的 Fe 中心协调。基于观察到的与 BD 3的 H/D 交换估计的水合度 (50 kcal/mol)需要在产物中形成 Fe-O 键以抵消吸能 CO 2插入。注意到μ 3 -氢化物配位降低了 DFT 计算中第一次 CO 2插入事件的活化势垒。
Compounds Based on a Triethyl- or Trimethoxybenzene Scaffold Bearing Pyrazole, Pyridine, and Pyrimidine Groups: Syntheses and Representative Binding Studies towards Carbohydrates
作者:Monika Mazik、Niklas Koch、Wilhelm Seichter
DOI:10.1055/s-2016-1561449
日期:——
carbohydrates showed interesting binding preferences of the new compounds. Pyrazole-based artificialreceptors have often been used in the recognition of ions, but in the area of sugar recognition the potential of pyrazole-based recognition groups has only been rarely examined. In this paper we describe the syntheses of twelve new pyrazole-bearing compounds, which are all potentially applicable for use as carbohydrate
Synthetic Factors Governing Access to Tris(β-diketimine) Cyclophanes versus Tripodal Tri-β-aminoenones
作者:Mary C. Eaton、Brian J. Knight、Robin Brahmi、Ricardo B. Ferreira、Vincent J. Catalano、Arnold L. Rheingold、Ion Ghiviriga、Leslie J. Murray
DOI:10.1021/acs.joc.0c01708
日期:2020.11.6
Tris(β-diketimine) cyclophanes are an important ligand class for investigating cooperative multimetallic interactions of bioinorganic clusters. Discussed herein are the synthetic factors governing access to tris(β-diketimine) cyclophanes versus tripodal tri-β-aminoenones. Cyclophanes bearing Me, Et, and MeO cap substituents and β-Me, Et, or Ph arm substituents are obtained, and a modified condensation method