Ultrasound-Assisted Synthesis of Some New N-(Substituted Carboxylic Acid-2-yl)-6-Methyl-4-Substituted Phenyl-3, 4-Dihydropyrimidine-2(1H)-One Carboxamides

K. Hameed, Karzan and H.S. Hussain, Faiq (2018) Ultrasound-Assisted Synthesis of Some New N-(Substituted Carboxylic Acid-2-yl)-6-Methyl-4-Substituted Phenyl-3, 4-Dihydropyrimidine-2(1H)-One Carboxamides. Eurasian Journal of Science and Engineering, 4 (2). ISSN 24145629

Text (Research Article) eajse.v4i2p61.pdf - Published Version Available under License Creative Commons Attribution Non-commercial No Derivatives. Download (1MB)

Abstract

In this work, the starting material 6-methyl-4- substituted phenyl-3,4-dihydropyrimidine-2-(1H)-one-5-carboxylic acid ethyl ester (3a,b) have been prepared from the condensation of benzaldehyde (or anisaldehyde), urea and ethyl acetoacetate, in presence of an acid in ethanol under sonication, then hydrolysed to the corresponding acids (4a,b) which were chlorinated with SOCl2 to produce 6-methyl4-substituted phenyl-3, 4-dihydropyrimidine-2-(1H)-one-carbonyl chloride (5a,b). The compounds (5a,b) then subjected to react with different amino acids in the presence of LaCl3.7H2O as a catalyst using a green method (ultrasound assisted technique) to give a new series of N-(Substituted carboxylic acid-2-yl)-6-methyl-4-substituted phenyl-3,4- dihydropyrimidine-2-(1H)-one-5-carboxamide (6a-e and 7a-h). The structures of the synthesized compounds were characterized by using FT-IR, 1H-NMR, 13C-NMR and elemental analysis.

Actions (login required)

View Item