The aldol products formed by the reaction between alpha-(N-benzyl or N-Cbz)amino aldehydes and lithium enolates of various ketones, were subjected to hydrogenolysis to give polysubstituted pyrroles in good yields (50-91%). The scope and limitations of this methodology are explored. (C) 2001 Elsevier Science Ltd. All rights reserved.
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.