Polyethylene glycol (PEG-400) as an efficient and recyclable reaction medium for one-pot synthesis of polysubstituted pyrroles under catalyst-free conditions
Polyethyleneglycol (PEG) was found to be an inexpensive non-toxic and effective medium for the one-pot synthesis of highly functionalized pyrroles. Utilizing this protocol various pyrrole derivatives were synthesized in excellent yields. Environmental acceptability, low cost, high yields, and recyclability of the PEG are the important features of this protocol.
Convenient synthesis of polysubstituted pyrroles and symmetrical and unsymmetrical bis-pyrroles catalyzed by H3PW12O40
作者:Mohammad Soltani、Iraj Mohammadpoor-Baltork、Ahmad R. Khosropour、Majid Moghadam、Shahram Tangestaninejad、Valiollah Mirkhani
DOI:10.1016/j.crci.2015.11.006
日期:2016.3
mild and environmentally-benign protocol for the efficient synthesis of polysubstituted pyrroles via a one-potthree-componentreaction of amines, α-bromo ketones and dialkyl acetylenedicarboxylate using H 3 PW 12 O 40 as a recyclable heterogeneous catalyst under solvent-free conditions at room temperature is reported. Importantly, the synthesis of symmetrical and unsymmetrical polysubstituted bis-pyrroles
摘要 使用 H 3 PW 12 O 40 作为可回收的多相催化剂,在无溶剂条件下,通过胺、α-溴酮和乙炔二羧酸二烷基酯的一锅三组分反应高效合成多取代吡咯的温和且环境友好的方案报告了室温条件。重要的是,对称和不对称多取代双吡咯的合成首次以良好的产量进行,这可以被视为该协议的一个显着特征。
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
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。