Rapid synthesis of quinoline-4-carboxylic acid derivatives from arylimines and 2-substituted acrylates or acrylamides under indium(iii) chloride and microwave activations. Scope and limitations of the reaction
quinoline-4-carboxylic acid derivatives has been achieved by reaction of 2-methoxy acrylates or acrylamides with N-arylbenzaldimines in acetonitrile under InCl3 catalysis and microwave irradiation. Isolated yields up to 57% within 3 min have been obtained. The Lewis acid and the microwave activation appeared as crucial parameters for the reaction. The role of indium chloride and ytterbium triflate was specified
在InCl3催化和微波辐射下,2-甲氧基丙烯酸酯或丙烯酰胺与N-芳基苯甲二胺在乙腈中的反应已实现了喹啉-4-羧酸衍生物的快速合成。在3分钟内获得了高达57%的分离产率。路易斯酸和微波活化似乎是反应的关键参数。使用13 C NMR数据和模型理论研究确定了氯化铟和三氟甲磺酸的作用。
π–π Stacking versus Steric Effects in Stereoselectivity Control: Highly Diastereoselective Synthesis ofsyn-1,2-Diarylpropylamines
作者:José L. García Ruano、José Alemán、Inés Alonso、Alejandro Parra、Vanesa Marcos、José Aguirre
DOI:10.1002/chem.200601893
日期:2007.7.16
2-diarylpropylamine derivatives. The sulfinyl group completely controls the configuration at C2 in the reactions of (S)-2. The configuration at C1 depends on the electron density of the ring adjacent to the iminic carbon atom which is modulated by pi-pi stacking interactions with the ring joined to the carbanionic centre. The stereoselectivity was controlled by modifying the acceptor character of the arylideneamine
Indium-mediated facile synthesis of 3-unsubstituted β-lactams
作者:Bimal K. Banik、Anjan Ghatak、Frederick F. Becker
DOI:10.1039/b002833i
日期:——
A simple synthesis of 3-unsubstituted β-lactams was achieved through indium-mediated reaction of imines with ethyl bromoacetate.
通过铟介导的亚胺与溴乙酸乙酯反应,实现了3-未取代β-内酰胺的简单合成。
Highly Stereoselective Reactions of <i>γ</i>-Sulfinyl Carbanions with Achiral Imines
作者:José Luis García Ruano、José Alemán、Alejandro Parra
DOI:10.1080/10426500590910800
日期:2005.3.2
Abstract Lithium 2-p-tolylsulfinylbenzyl carbanions react with different N-substituted imines affording 1,2-diaryl ethyl (and propyl) amines with a high stereoselectivity control at both benzyllic (only dependent of the sulfur configuration) and iminic carbons. The anti:syn ratio, ranging between > 96: < 4 and < 2: > 98, dependent on the electronic density at nitrogen.
Synthesis of Chromeno[3,4-b]piperazines by an Enol-Ugi/Reduction/Cyclization Sequence
作者:Ana Bornadiego、Ana G. Neo、Carlos F. Marcos
DOI:10.3390/molecules26051287
日期:——
Keto piperazines and aminocoumarins are privileged building blocks for the construction of geometrically constrained peptides and therefore valuable structures in drug discovery. Combining these two heterocycles provides unique rigid polycyclic peptidomimetics with drug-like properties including many points of diversity that could be modulated to interact with different biological receptors. This work