Fast and Efficient One-Pot Three-Component Synthesis of Some 1,2,3,4- Tetrahydro-6-methyl-N-phenyl-5-pyrimidinecarboxamide Derivatives via Biginelli Condensation Reaction

Author(s): Şirin Gülten*, Ufuk Gezer, Elmas Aksanli Gündoğan

Journal Name: Letters in Organic Chemistry

Volume 17 , Issue 5 , 2020

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Graphical Abstract:


Tetrahydropyrimidine (THPM) synthesis has an enormous importance in organic chemistry and especially in pharmaceutical applications. Pyrimidines are the most active class of N-containing heterocyclic compounds and have different biological properties. The heterocyclic ring system with a thio group occupy a unique position in medicinal chemistry. This type of compounds play an important role in synthetic drugs and in biological processes. Dihydropyrimidinethione derivatives occur widely in nature. Several modifications of THPM-5-carboxamides have attracted considerable interest of medicinal chemists due to their pharmacological and therapeutic properties. A series of 1,2,3,4-tetrahydro- 2-pyrimidinone/thione derivatives bearing a phenylcarbamoyl group at C-5 position were synthesized by one-pot three-component Biginelli condensation reaction. The reaction of acetoacetanilide as the 1,3-dicarbonyl component with various aromatic aldehydes and urea/thiourea in the presence of a catalytic amount of p-toluenesulfonic acid monohydrate (PTSA·H2O) or concentrated HCl as an efficient catalyst leads to Biginelli compounds. We have prepared eight THPM 5-carboxamide derivatives, four of them are new compounds. Their structures were confirmed by spectroscopic techniques and elemental analysis. These compounds have potential applications in organic synthesis and medicinal chemistry. We have synthesized a series of THPM-5-carboxamides by simple and efficient threecomponent Biginelli condensation reaction. Significant benefits of the present procedure include: a) application of inexpensive, non-toxic, environmentally friendly and easily available catalysts, b) the reactions are easy to carry out without high temperature and the workup is very simple, c) the required reaction times are relatively short (30-80 min with HCl and 8-24 h with PTSA·H2O), d) compatibility with various functional groups, e) the products are isolated in good to excellent yields (50-95%).

Keywords: Acetoacetanilide, Biginelli condensation, one-pot condensation, tetrahydropyrimidines, thiourea, urea.

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Article Details

Year: 2020
Published on: 28 April, 2020
Page: [366 - 371]
Pages: 6
DOI: 10.2174/1570178616666190819142221
Price: $65

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