Rhodium-Catalyzed Synthesis of Imines and Esters from Benzyl Alcohols and Nitroarenes: Change in Catalyst Reactivity Depending on the Presence or Absence of the Phosphine Ligand
作者:Taemoon Song、Ji Eun Park、Young Keun Chung
DOI:10.1021/acs.joc.8b00197
日期:2018.4.6
catalyzes the reductive N-alkylation of aryl nitro compounds with alcohols by a borrowing-hydrogen strategy to afford the corresponding imine products in good to excellent yields. In the absence of xantphos, the [Rh(COD)Cl]2/Cs2CO3 catalytic system behaves as an effective catalyst for the dehydrogenative coupling of alcohols to esters, with nitrobenzene as a hydrogen acceptor. The reactivity of the
[Rh(COD)Cl] 2 / xantphos / Cs 2 CO 3系统通过借位氢策略有效催化芳基硝基化合物与醇的还原性N-烷基化,从而以良好或优异的收率提供相应的亚胺产品。在不存在黄药的情况下,[Rh(COD)Cl] 2 / Cs 2 CO 3催化体系可作为醇与酯脱氢偶联的有效催化剂,硝基苯为氢受体。铑催化体系的反应性可以很容易地控制以选择性地提供亚胺或酯。
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。
Ruthenium(0)-Catalyzed C–H Arylation of Aromatic Imines under Neutral Conditions: Access to Biaryl Aldehydes
作者:Feng Hu、Michal Szostak
DOI:10.1021/acs.orglett.6b01738
日期:2016.9.2
The first ruthenium(0)-catalyzed C–H bond arylation of aromatic imines with arylboronates under neutral conditions is reported. This versatile method provides rapid access to a wide range of biaryl aldehydes that are difficult to assemble using traditional methods with high atom economy. A new hydrogen acceptor for Ru(0) arylation has been identified. This atom-economical strategy has potential for
Diarylacetylenes, enamines and acetylenic polymers and their production
申请人:——
公开号:US05233046A1
公开(公告)日:1993-08-03
Diarylacetylenes and diarylenamines are synthesized from a Schiff's base and an N-arylmethylheterocycle; these compounds are useful as intermediates for a variety of polymers; in particular an efficient process is provided for producing diaryl acetylenes useful in the efficient production of acetylene group-containing polymers which can be cross-linked to produce high strength polymers free of structural defects such as conventionally arise as a result of liberation of volatiles during the cross-linking.
β-Selective Reductive Coupling of Alkenylpyridines with Aldehydes and Imines via Synergistic Lewis Acid/Photoredox Catalysis
作者:Katarzyna N. Lee、Zhen Lei、Ming-Yu Ngai
DOI:10.1021/jacs.7b01373
日期:2017.4.12
Umpolung (polarity reversal) strategies of aldehydes and imines have dramatically expanded the scope of carbonyl and iminyl chemistry by facilitating reactions with non-nucleophilic reagents. Herein, we report the first visible light photoredox-catalyzed β-selective reductive coupling of alkenylpyridines with carbonyl or iminyl derivatives with the aid of a Lewisacid co-catalyst. Our process tolerates