Direct Synthesis of Pyrrolo[1,2-α]quinoxalines <i>via</i> Iron-Catalyzed Transfer Hydrogenation between 1-(2-Nitrophenyl)pyrroles and Alcohols
作者:Simin Chun、Jiwon Ahn、Ramachandra Reddy Putta、Seok Beom Lee、Dong-Chan Oh、Suckchang Hong
DOI:10.1021/acs.joc.0c02145
日期:2020.12.4
Herein, we describe novel iron-catalyzed transferhydrogenation between alcohols and 1-(2-nitrophenyl)pyrroles for the synthesis of pyrrolo[1,2-α]quinoxalines. The tricarbonyl (η4-cyclopentadienone) iron complex catalyzed the oxidation of alcohols and the reduction of nitroarenes, and the corresponding aldehydes and aniline were generated in situ. The resulting Pictet–Spengler-type annulation/oxidation
Mo–Catalyzed One‐Pot Synthesis of
<i>N</i>
‐Polyheterocycles from Nitroarenes and Glycols with Recycling of the Waste Reduction Byproduct. Substituent‐Tuned Photophysical Properties
作者:Raquel Hernández‐Ruiz、Rubén Rubio‐Presa、Samuel Suárez‐Pantiga、María R. Pedrosa、Manuel A. Fernández‐Rodríguez、M. José Tapia、Roberto Sanz
DOI:10.1002/chem.202102000
日期:2021.9.24
reduction–imine formation–intramolecular cyclization–oxidation for the general synthesis of a wide variety of biologically relevant N-polyheterocycles, such as quinoxaline- and quinoline-fused derivatives, and phenanthridines, is reported. A simple, easily available, and environmentally friendly dioxomolybdenum(VI) complex has proven to be a highly efficient and versatile catalyst for transforming a
Palladium-Catalyzed Decarboxylative Cross-Coupling Reaction Between Heteroaromatic Carboxylic Acids and Aryl Halides
作者:François Bilodeau、Marie-Christine Brochu、Nicolas Guimond、Kris H. Thesen、Pat Forgione
DOI:10.1021/jo9022793
日期:2010.3.5
A full overview of the decarboxylative cross-coupling reaction between heteroaromatic carboxylic acids and aryl halides is described. This transformation employs palladium catalysts with short reaction times providing facile synthesis of aryl-substituted heteroaromatics. The effect of each reaction parameter including solvent, base, and additive employed as well as the full substrate scope of this
Molybdenum-Catalyzed Synthesis of Nitrogenated Polyheterocycles from Nitroarenes and Glycols with Reuse of Waste Reduction Byproduct
作者:Rubén Rubio-Presa、Marı́a R. Pedrosa、Manuel A. Fernández-Rodríguez、Francisco J. Arnáiz、Roberto Sanz
DOI:10.1021/acs.orglett.7b02792
日期:2017.10.6
the efficient synthesis of pyrrolo(indolo)[1,2-a]quinoxalines and pyrrolo(indolo)[3,2-c]-quinolines from readily available nitrobenzenes and glycols is reported. The process utilizes the carbonyl byproduct of the initial dioxomolybdenum(VI)-catalyzed reduction of nitroaromatics with glycols as a reagent for the imine generation. This method represents the first sustainable domino reaction for the preparation
compounds with widespread applications in many fields. Tetramethylammonium fluoride tetrahydrate was found to promote the biaryl coupling of aryl iodides bearing electron-withdrawing substituents with unactivated arenes. The reaction takes place at temperatures between 100 and 150°C and can be applied to a wide range of aromatic and heteroaromatic rings, affording the products in moderate to high yields.