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This paper reports the synthesis and characterization of some new barbituric acid derivatives from sulfadiazine. A reaction of sulfadiazine with chloroacetyl chloride gave 2-chloro-N-(4-(N-pyrimidin-2-ylsulfamoyl) phenyl) acetamide [A] which was reacted with thiourea and K 2 CO 3 to give thiazole derivative [B]. Schiff base compounds [Sh 1-Sh 3 ] were prepared from condensation of thiazole derivative with different aromatic benzaldehydes. Then, addition reaction of acetyl chloride to Schiff bases afforded new tertiary amides compounds [D 1-D 3 ]. The latter compounds were allowed to react with 1, 3-bis (hydroxyl methyl) barbituric acids derivatives [E 1-E 2 ] via Williamson reaction to form new barbituric acid derivatives [F 1-F 3 ] and [G 1-G 3 ]. Thin layer chromatography, melting points, Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1 H-NMR) and carbon-13 nuclear magnetic resonance (13 C-NMR) techniques confirmed formation of the prepared compounds. Antimicrobial studies of the synthesized compounds were assayed against three different types of bacteria, including Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli, and against two types of fungi Aspergillus flavus and Candida Albicans. Biological applications of the synthesized compounds showed a greater effect on antimicrobial activities than the standard.

A new series of barbituric acid derivatives w prepared and characterized by Fourier-transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance ( 1 H-NMR) and nuclear magnetic resonance ( 13 C-NMR). The antimicrobial studies of synthesized compounds were screened for antibacterial activity against three different types of bacteria (Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli), and against two types of fungi (Candida albicans and Aspergillus flavus). In this research, a reaction of sulfadiazine with chloroacetylchloride gave 2-chloro-N-(4-(N-pyrimidin-2-ylsulfamoyl) phenyl) acetamide [A] which was reacted with thiourea, and with K 2 CO 3 to give thiazole derivative [B]. The last compound (thiaole derivative) was reacted with chloroacetyl chloride in basic medium to form compound [R]. 5,5-Diethyl barbituric acid and 5-phenyl,5-ethyl barbituric acid were treated with formaldehyde to give 1,3-bis(hydroxyl methyl)barbituric acids derivatives [B 1 ] and [B 2 ]. Finally, the compound [R] reacted with 1,3-bis(hydroxyl methyl) barbituric acids derivatives via Williamson reaction to form new barbituric acid derivatives [RB 1 ]and [RB 2 ]. By the reaction of 5,5-diethyl barbituric acid with 5-phenyl,5-ethyl barbituric acid, new compounds of barbituric acids derivatives [RB 3 ] and [RB 4 ] were obtained. The biological applications of the synthesized compounds showed a greater effect in antimicrobial activities from the starting material (sulfadiazine).

This research involved the conversion of sulfadiazine into compound 2-chloro-N-(4-(N-(pyrimidin-2-yl) sulfamoyl) phenyl) acetamide [A] through the reaction of sulfadiazine with chloroacetyl chloride in the presence of diethylamine in dimethylformamide as solvent. Then prepared the hydrazine derivative of sulfadiazine 2-hydrazinyl-N-(4-(N-(pyrimidin-2-yl) sulfamoyl) phenyl) acetamide [B] through the interaction of compound [A] with hydrazine in dimethylformamide as solvent. Followed by chalcones preparation [C1, C2, C3, C4, and C5] from the reaction of 4-aminoacetophenone with some aromatic aldehydes in a basic medium in absolute ethanol using an ice bath. Pyrazoline derivatives [BC1, BC2, BC3, BC4, and BC5] were prepared from the reaction of the hydrazine derivative of sulfadiazine [B] with chalcones in a basic medium in the presence of absolute ethanol. The pyrazole derivatives [IBC1, IBC2, IBC3, IBC4, and IBC5] were prepared from the reaction of the hydrazine derivative of sulfadiazine [B] with chalcones in the presence of glacial acetic acid and then the product was oxidized using Iodine. Synthesized compounds have been studied by their melting points, and characterized by C.H.N.S analysis, FT-IR and 1H-MNR spectroscopy and studied of biological activity.