A Phosphine-mediated Synthesis of 2,3,4,5-tetra-substituted Nhydroxypyrroles from α-oximino Ketones and Dialkyl Acetylenedicarboxylates Under Ionic Liquid Green-media

Author(s): Ashraf S. Shahvelayati*, Maryam Ghazvini, Khadijeh Yadollahzadeh, Akram S. Delbari.

Journal Name: Combinatorial Chemistry & High Throughput Screening

Volume 21 , Issue 1 , 2018

Abstract:

Background: The development of multicomponent reactions (MCRs) in the presence of task-specific ionic liquids (ILs), used not only as environmentally benign reaction media, but also as catalysts, is a new approach that meet with the requirements of sustainable chemistry.

In recent years, the use of ionic liquids as a green media for organic synthesis has become a chief study area. This is due to their unique properties such as non-volatility, non-flammability, chemical and thermal stability, immiscibility with both organic compounds and water and recyclability. Ionic liquids are used as environmentally friendly solvents instead of hazardous organic solvents.

Objective: We report the condensation reaction between α-oximinoketone and dialkyl acetylene dicarboxylate in the presence of triphenylphosphine to afford substituted pyrroles under ionic liquid conditions in good yields.

Result: Densely functionalized pyrroles was easily prepared from reaction of α-oximinoketones, dialkyl acetylene dicarboxylate in the presence of triphenylphosphine in a quantitative yield under ionic liquid conditions at room temperature.

Conclusion: In conclusion, ionic liquids are indicated as a useful and novel reaction medium for the selective synthesis of functionalized pyrroles. This reaction medium can replace the use of hazardous organic solvents. Easy work-up, synthesis of polyfunctional compounds, decreased reaction time, having easily available-recyclable ionic liquids, and good to high yields are advantages of present method.

Keywords: Dialkyl acetylenedicarboxylate, α-oximinoketone, N-hydroxypyrroles, ionic liquid, tandem reaction, β-dicarbonyl compounds, green media, phosphine-mediated synthesis.

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Article Details

VOLUME: 21
ISSUE: 1
Year: 2018
Page: [14 - 18]
Pages: 5
DOI: 10.2174/1386207321666180124094536

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