Skip to content
Research Article Open access CC BY 4.0

The Recyclable Bronsted Acidic Liquid Resin Mediated Eco-benign Synthesis of 3,4-Dihydropyrimidine-2(1H)-ones and 3,4-Dihydropyrimidin-2(1H)-thiones via Biginelli Reaction

D. Parthiban, R. Joel Karunakaran, C. J. Magesh

International Research Journal of Pure and Applied Chemistry · pp. 1–10 · Published 7 Mar 2018

10.9734/IRJPAC/2018/40035

Abstract

Aim: To synthesis 3,4-Dihydropyrimidin-2(1H)-ones and 3,4-Dihydropyrimidin-2(1H)-thiones using phenol formaldehyde resin as a catalyst. Study Design: Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones and 3,4-Dihydropyrimidin-2(1H)-thiones by cyclocondensation of ethyl or methyl acetoacetates, aldehydes and urea or thiourea using Bronsted acidic phenol-formaldehyde liquid resin as homogenous catalyst and as reaction medium under solvent-free condition. Methodology: Cyclocondensation of aromatic aldehyde, (thio) urea, ketoester was done in the presence of phenol-formaldehyde resin at 110°C with stirring for appropriate time. The progress of the reaction was monitored by TLC. After completion of the reaction. The product was extracted by ethyl acetate solvent. The product was purified either by recrystallization in hot ethanol or by column chromatography. All the products were thoroughly characterised by FT-IR, 1H-NMR, 13C-NMR, Mass spectral and CHN elemental analysis. Results: 15 different 3,4-Dihydropyrimidin-2(1H)-ones were synthesized and characterized thoroughly. Conclusion: We have developed an efficient method for one pot synthesis of 3,4-dihydropyrimidine-2-ones (DHPOs) and 3,4-dihydropyrimidine-2-thiones (DHPTs) by employing phenol-formaldehyde liquid resin as catalyst as well as medium for the Biginelli reaction. The advantages of this procedure includes not only free from volatile organic solvent, toxic metal catalyst, strong acid, but simple procedure, shorter reaction time, easy workup, and reusable catalysts conditions, and formation of pure products in good to excellent yields.

3,4-Dihydropyrimidin-2(1H)-ones 3,4-Dihydropyrimidin-2(1H)-thiones Biginelli reaction Phenol-formaldehyde resin Solvent free condition Multicomponent reactions

Cited by 10

Polymer Supported Ferric Chloride as Heterogeneous Catalyst for Three Component Biginelli Reaction

Akash V. Gujarati, Ashutosh V. Bedekar, Arun L. Patel · Catalysis Letters · 2024

Article metrics

Real usage data collected on this platform.

0

Page views

0

PDF downloads

0

Outbound clicks

10

Citations

Views by country

Approximate, from request IP at view time — not citizenship or institution. Countries with fewer than 5 views are grouped as "Other".

No views recorded yet.

Traffic sources

Referring site, by host.

No traffic recorded yet.

Views and downloads exclude known bots/crawlers. Citations combines this platform's own DOI-resolved index with each external source's own reported total — see Cited by above for individually listed citing works. Last refreshed 0 seconds ago.