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12. N,N′-Dialkyl-4-Aryl-3,4-Dihydropyrimidinones and Thiones: Ceric Ammonium Nitrate Catalyzed Synthesis and Molecular.

Author

Kathing, Chingrishon, Kumar, Sushil, Tumtin, Shokip, Singh, Nongthombam Geetmani, Rani, Jims World Star, Nongrum, Ridaphun, and Nongkhlaw, Rishanlang

Subjects
*THIONES, *AMMONIUM nitrate, *PYRIMIDINES, *AROMATIC aldehydes, *THIOUREA
Abstract

This work presents a microwave assisted solvent-free synthesis of N,N′-dialkyl-4-aryl-3,4-dihydropyrimidinones/thiones in the presence of Ceric Ammonium Nitrate (CAN) via direct condensation of aromatic aldehydes, β-keto ester, and N,N′-dialkylurea/thiourea. The highlights of the methodology adopted are (i) facile condensation of the reactants into product without any side-products, and (ii) short reaction time with high yield and good purity. All the compounds synthesized were characterized and established by spectroscopic techniques such as FTIR, 1H NMR, 13C NMR, and Mass. The structure of the compound is further corroborated by single crystal X-ray diffraction analysis. [ABSTRACT FROM AUTHOR]

Published
2017
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15. One-pot Synthesis of 3,4-Dihydropyrimidin-2(1 H)-ones Catalysed by Cupric Acetate under Solvent-free Conditions.

Author

Kathing, Chingrishon, Rani, Jims World Star, Singh, Nongthombam Geetmani, Tumtin, Shokip, Nongrum, Ridaphun, and Nongkhlaw, Rishanlang

Subjects
*DIHYDROPYRIDINE, *COPPER compounds synthesis, *AROMATIC aldehydes, *HYDANTOINASE, *CHEMICAL derivatives
Abstract

A solvent-free synthesis of 3,4-dihydropyrimidin-2(1 H)-ones from aromatic aldehydes, β-keto ester/acetyl acetone and urea catalysed by cupric acetate under thermal condition is reported as a simple and an efficient protocol. Compared with classical Biginelli reaction reported in 1893, this new method provides much improved modification in terms of yield and reaction time. The usage of milder catalyst, environmental friendly procedures and excellent yields within a very short time (5-15 min) are the advantages of the method in which the involvement of solvent-free condition adds an edge to the method. Thus, the efficiency of the protocol enabled the rapid synthesis of 3,4 -dihydropyrimidin-2(1 H)-one derivatives in a short duration. [ABSTRACT FROM AUTHOR]

Published
2014
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