Manganese‐Catalyzed Multicomponent Synthesis of Pyrroles through Acceptorless Dehydrogenation Hydrogen Autotransfer Catalysis: Experiment and Computation
作者:Jannik C. Borghs、Luis Miguel Azofra、Tobias Biberger、Oliver Linnenberg、Luigi Cavallo、Magnus Rueping、Osama El‐Sepelgy
DOI:10.1002/cssc.201802416
日期:2019.7.5
A new base metal catalyzed sustainable multicomponent synthesis of pyrroles from readily available substrates is reported. The developed protocol utilizes an air‐ and moisture‐stable catalyst system and enables the replacement of themutagenic α‐haloketones with readily abundant 1,2‐diols. Moreover, the presented method is catalytic in base and the sole byproducts of this transformation are water and
A novel rhenium complex1 bearing a non-innocent PNP pincer ligand was prepared. This novel catalyst is active in hydrogen autotransfer reactions to form new C-C and C-N bonds. More specifically,...
Multicomponent reactions in PEG-400: ruthenium-catalyzed synthesis of substituted pyrroles
作者:Srivari Chandrasekhar、Vidyavathi Patro、Lahu N. Chavan、Rambabu Chegondi、René Grée
DOI:10.1016/j.tetlet.2014.08.105
日期:2014.10
An efficient and eco-friendly method for the synthesis of substituted pyrroles has been developed via ruthenium-catalyzed multicomponent reaction of ketone, amine, and ethylene glycol in PEG-400 as solvent medium without using any external ligand. The catalytic system and solvent can be recycled with the same, as well as different, ketones with minimum loss of Ru-catalyst activity.
alkyl substrates were efficiently converted in combination with different type of amines and vicinal diols into various substituted pyrroles in reasonable to excellent isolated yields. Additionally, α-functionalized ketones gave synthetically interesting amido-, alkoxy-, aryloxy-, and phosphate-substituted pyrroles in a straightforward manner. The synthetic protocol proceeds in the presence of a commercially