The three-component reactions of phenacyl bromide or its derivatives, amine, and dialkyl acetylenedicarboxylate in the presence of iron(III) chloride as a catalyst at room temperature afforded polysubstituted pyrroles in high yields. polysubstituted pyrroles - three-component reaction - iron(III) chloridePart 283 in the series ‘Studies on Novel Synthetic Methodologies’.
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。
Synthesis of polysubstituted pyrroles in aqueous medium directly from nitro compounds
作者:L. Madhava Reddy、P. Chandrashekar、A. R. Reddy、C. K. Reddy
DOI:10.1134/s1070363215010272
日期:2015.1
A novel approach for the synthesis of polysubstituted pyrroles has been followed through multicomponent reaction of nitro compounds, phenacyl bromide or its derivatives and dialkyl acetylene dicarboxylates using indium in dilute aqueous HCl at room temperature. The products are formed in high yields (75-87%) in 10-16 h.
Novel and efficient supramolecular synthesis of pyrroles in the presence of β-cyclodextrin in water
A simple and efficient synthesis of highly substituted pyrroles was achieved in water medium via multi-component strategy, using amine, DMAD/DEAD as well as phenacyl bromide catalyzed by beta-CD. Utilizing this protocol various pyrrole derivatives were synthesized in good to excellent yields. (C) 2012 Y.V.D. Nageswar. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.