Zirconocene dichloride catalysed one-pot synthesis of pyrroles through nitroalkene-enamine assembly
作者:Sandeep Goyal、Jatinkumar K. Patel、Mukesh Gangar、Kapil Kumar、Vipin A. Nair
DOI:10.1039/c4ra09873k
日期:——
Zirconocene dichloride was found to be a highly efficient catalyst for the synthesis of multi-substituted pyrroles by a three-component, one-pot reaction.
锆二氯化物被发现是合成多取代吡咯烷的高效催化剂,通过三组分、一锅法反应。
Synthesis of Pyrroles from β-Enamines and Nitroolefins Catalyzed by I<sub>2</sub> under High-speed Vibration Milling (HSVM)
A solvent-free reaction, using a high-speed vibration milling (HSVM) technique, has been developed for the synthesis of polysubstituted pyrroles from β-enamines and nitroolefins as the raw materials, by using iodine as the catalyst. The influences of the vibration frequency and the reaction time were investigated and a series of 2,3,4-polysubstituted pyrroles were obtained in good yields at short reaction times (20 min) under the HSVM condition. It is an efficient, simple, and moderate approach for synthesizing polysubstituted pyrroles under the HSVM conditions.
Polyethylene Glycol (PEG-400) as an Efficient and Recyclable Reaction Medium for One-Pot Synthesis of Substituted Pyrroles Under Catalyst-Free Conditions
作者:Tulam Vijaya Kumar、Ch. Rama Koteswara Rao、K. Mukkanti、Prathama S. Mainkar
DOI:10.14233/ajchem.2015.18334
日期:——
Polyethylene glycol (PEG-400) was found to be an effective and nontoxic reaction medium for the one-pot synthesis of substituted pyrroles under catalyst-free conditions in excellent yields. Environmental acceptability, low cost, high yields and recyclability of the polyethylene glycol are the important features of this protocol.
A series of polysubstituted pyrroles were rapidly synthesized in moderate to good yields via catalyst-free one-pot three-component reaction of 1,3-dicarbonyl compounds with primary amines and nitrostyrenes by using liquid-assisted grinding. This protocol provides several advantages over the conventional chemical synthesis, such as simple work-up procedure, wide substrate scope, short reaction time
采用液体辅助研磨,1,3-二羰基化合物与伯胺和硝基苯乙烯的无催化剂一锅三组分反应快速合成了一系列多取代吡咯,收率适中。该协议比传统的化学合成具有几个优点,例如简单的后处理程序、广泛的底物范围、短的反应时间和环境友好性。通过1 H NMR、13 C NMR 和 ESI-MS 研究证实了多取代吡咯的结构。