Ionic Liquid Promoted Multicomponent Reaction: A Good Strategy for the Eco-Compatible Synthesis of Functionalized Pyrroles
作者:I. R. Siddiqui、Devesh Kumar、Shayna Shamim
DOI:10.1002/jhet.1085
日期:2013.2
reusable, alternative, and effective reaction media for multicomponentsynthesis of highly functionalized pyrroles. Generality of the procedure was established by synthesizing various pyrroles from wide range of aromatic/aliphatic amine, phenacyl bromide, and electrophilic alkynes by utilizing this protocol without any acid or metal catalyst. Ecocompatibility, short reaction time, excellent yield, recyclability
Facile synthesis of polysubstituted 2,3-dihydropyrroles and pyrroles from Mn(OAc)3-promoted oxidative cyclization of alkenes with amines/alkyne esters or enaminone esters
A novel oxidative cyclization of alkenes with amines/alkyne esters or enaminone esters can be efficiently promoted by Mn(OAc)3, furnishing a series of polysubstituted 2,3-dihydropyrroles in moderate to excellent isolated yields (75–91%). Afterward addition of a suitable oxidant such as K2S2O8 can furnish efficient synthesis of the corresponding polysubstituted pyrroles in a one-pot pathway.
Mn(OAc)3可以有效地促进烯烃与胺/炔烃酯或烯胺酯的新型氧化环化反应,从而以中等至优异的分离产率(75-91%)提供一系列多取代的2,3-二氢吡咯。之后加入合适的氧化剂,例如K 2 S 2 O 8,可以在一锅法中有效合成相应的多取代吡咯。