Fischer aminocarbene complexes of chromium and iron: Anomalous electrochemical reduction of p-carbonyl substituted derivatives
摘要:
This contribution shows how a small change of a remote substituent (COOCH(3) for e.g. OCH(3)) on Fischer aminocarbene complexes can change totally the LUMO location, and thus electron distribution, extent of pi-electron delocalization and, consequently, redox properties of these potential catalysts. During investigation of redox properties of extended series of title compounds, an exceptionally positive reduction potential was observed (non fitting the LFER plot) for p-COOR substituents. This effect is caused by a strong intramolecular electronic interaction, which is specific for p-phenylene dicarbonyl compounds. In this context, the CN bond in aminocarbene moiety has a double bond character and resembles carbonyl function. The interpretation was proved by DFT calculations. (C) 2011 Elsevier Ltd. All rights reserved.
在简单的耐空气无机盐K 3 PO 4的催化下,已使用各种羧酸作为偶联剂构建了伯/仲胺直接N-单/二烷基/氟烷基化的可扩展方案。有利的特征包括100种实例,10种药物和类药物胺,氟化复杂的叔胺,克级合成和同位素标记胺,因此证明了该方法在工业上的潜在适用性。与减少酰胺中间体所需的传统反应性金属氢化物或硼氢化物相比,反应性较小的氢化硅的参与可能有助于显着的官能团相容性。
Direct
<i>N‐</i>
Alkylation/Fluoroalkylation of Amines Using Carboxylic Acids via Transition‐Metal‐Free Catalysis
作者:Chunlei Lu、Zetian Qiu、Maojie Xuan、Yan Huang、Yongjia Lou、Yiling Zhu、Hao Shen、Bo‐Lin Lin
DOI:10.1002/adsc.202000679
日期:2020.10.6
scalable protocol of direct N‐mono/di‐alkyl/fluoroalkylation of primary/secondary amines has been constructed with various carboxylicacids as coupling agents under the catalysis of a simple air‐tolerant inorganic salt, K3PO4. Advantageous features include 100 examples, 10 drugs and drug‐like amines, fluorinated complex tertiary amines, gram‐scale synthesis and isotope‐labelling amine, thus demonstrating
在简单的耐空气无机盐K 3 PO 4的催化下,已使用各种羧酸作为偶联剂构建了伯/仲胺直接N-单/二烷基/氟烷基化的可扩展方案。有利的特征包括100种实例,10种药物和类药物胺,氟化复杂的叔胺,克级合成和同位素标记胺,因此证明了该方法在工业上的潜在适用性。与减少酰胺中间体所需的传统反应性金属氢化物或硼氢化物相比,反应性较小的氢化硅的参与可能有助于显着的官能团相容性。
Fischer aminocarbene complexes of chromium and iron: Anomalous electrochemical reduction of p-carbonyl substituted derivatives
作者:Irena Hoskovcová、Radka Zvěřinová、Jana Roháčová、Dalimil Dvořák、Tomáš Tobrman、Stanislav Záliš、Jiří Ludvík
DOI:10.1016/j.electacta.2011.05.096
日期:2011.7
This contribution shows how a small change of a remote substituent (COOCH(3) for e.g. OCH(3)) on Fischer aminocarbene complexes can change totally the LUMO location, and thus electron distribution, extent of pi-electron delocalization and, consequently, redox properties of these potential catalysts. During investigation of redox properties of extended series of title compounds, an exceptionally positive reduction potential was observed (non fitting the LFER plot) for p-COOR substituents. This effect is caused by a strong intramolecular electronic interaction, which is specific for p-phenylene dicarbonyl compounds. In this context, the CN bond in aminocarbene moiety has a double bond character and resembles carbonyl function. The interpretation was proved by DFT calculations. (C) 2011 Elsevier Ltd. All rights reserved.