In this work a variety of new compounds such as chalcones, pyridine and isooxazoline derivatives has been synthesized. 2-((1-(4-acetylphenyl)-4,5-dihydro-1H-1,2,3-triazol-4-yl)methyl)benzo[d]isothiazol-3(2H)-one 1,1-dioxide(1) have been chosen as a starting material. Condensation of compound(1) with aromatic aldehydes namely benzaldehyde, p-chloro benzaldehyde, p-bromo benzaldehyde, p-nitro benzaldehyde, p-hydroxy benzaldehyde, m-hydroxy benzaldehyde, p-N,N-dimethyl benzaldehyde and 2,4-dimethoxy benzaldehyde in the presence of 40% KOH gave chalcone derivatives (2a-h). The cyclization of prepared chalcone derivatives semicarbazide in the presence acetic acid product pyrazoline derivatives(3a-f). Reaction of chalcone derivatives(2a-h) with hydroxylamine hydrochloride in the presence of sodium acetate afforded corresponding isooxazoline derivatives (4a-d). FT-IR, 1HNMR, and 13CNMR were used to characterize the target compounds. The results showed that the target compounds have a good biological activity such as antibacterial and antioxidant. The molecular docking studies of the target 6ul7 with the newly synthesized compounds showed good docking scores with acceptable binding interactions. The present results reveal that the newly synthesized compounds exhibit promising inhibition activity against Escherichia Coli.
; AJC-18665 2-Aminobenzothiazole (1) was converted to the corresponding diazonium salt which was introduced in coupling reaction with alkaline solution of 2-hydroxybenzaldehyde as coupling reagent to give azo-benzothiazole derivative (2) bearing aldehyde group. The resulting aldehyde (2) was introduced in condensation reactions with the primary aromatic amines including (4-nitroaniline, 3-nitroaniline, 4-hydroxyaniline, 4-methoxyaniline, 2-methoxyaniline, 4-bromoaniline, 4-chloroaniline and 2,4-dichloroaniline) using microwave irradiation technique in absolute ethanol to produce eight imine derivatives of benzothiazole (3a-h), respectively. Treatment of the resulting imines (3a-h) with glycine using microwave irradiation in tetrahydrofuran afforded eight new imidazolidines (4a-h) substituted with benzothiazole moiety, respectively. Preliminary in vitro antibacterial activity of the target compounds were investigated using two types of bacteria, Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative). The results indicated that the newly synthesized imidazolidines (compounds 4a, 4b, 4c, 4d, 4e, 4g and 4h) exhibited greater activities than gentamycin against Gram-positive bacteria. On the other hand, compounds 4d and 4h were also showed better activities against Gram-negative bacteria when compared with that of the control drug (gentamycin).
5-(4-Aminophenyl)-2-thiol-1,3,4-oxadiazole (1) was synthesized via the reaction of carbon disulfide with 4-aminobenzoyl hydrazide in presence of potassium hydroxide in absolute ethanol. Compound 1 was converted to the corresponding diazonium salt which was introduced in coupling reaction with alkaline solution of 2-hydroxybenzaldehyde as coupling reagent to give azooxadiazole derivative 2 containing aldehyde group. The resulting aldehyde 2 was then introduced in condensation reactions with the primary aromatic amines including (4-bromoaniline, 4-chloroaniline, 4-nitroaniline, 3-nitroaniline, 4-methoxyaniline and 4-hydroxyaniline) using microwave irradiation technique in absolute ethanol to produce six imine derivatives of 1,3,4-oxadiazole (3a-f), respectively. Treatment of the resulting imines 3a-f with glycine using microwave irradiation in tetrahydrofuran afforded six new imidazolidines 4a-f substituted with 1,3,4-oxadiazole moiety, respectively. in vitro Antibacterial activity of the target compounds were investigated using two types of bacteria, Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative). The results indicated that the newly synthesized imidazolidines (compounds 4d and 4f) showed enhanced activity against Gram-negative bacteria when compared with that of the control drug (gentamycin).
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