- Design, synthesis, docking studies and biological evaluation of 2-phenyl-3-(Substituted benzo[d] thiazol-2-ylamino)-quinazoline-4(3H)-one derivatives as antimicrobial agents
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Objective: A new series 2-phenyl-3-(substituted benzo[d] thiazol-2-ylamino)-quinazoline-4(3H)-one was prepared by the fusion method by reacting 2-phenyl benzoxazine with 2-hydrazino benzothiazole and it was evaluated for their antimicrobial activity against gram positive, gram negative bacteria and fungi. Methods: Titled compounds were synthesized by fusion reactions. These compounds were evaluated by in vitro antibacterial and antifungal activity using the minimum inhibitory concentration and zone of inhibition methods. The synthesized compounds were characterized with the help of infrared, NMR and mass spectral studies. The benzothiazole moiety and the quinazoline ring have previously shown DNA gyrase inhibition and target related antibacterial activity. Thus, molecular docking studies of synthesized compounds were carried out (PDB: 3G75) to study the possible interaction of compounds with the target. The batch grid docking was performed to determine the probable. Results: These compounds showed significant activity against gram positive and gram negative bacteria as well against the fungi. The compound A5 was found to be active against B. subtilis, P aeruginosa and C. albican at 12.5 μg/ml MIC. The compound A3 was found to be active against all microbial strains selected at 25 and 12.5 μg/ml MIC. Conclusion: Though the relationship between the activities shown by these compounds in, the antimicrobial study is still to be established, the docking studies conducted found to be consistent with antimicrobial results. Thus the results indicate that the designed structure can be a potential lead as an antimicrobial agent.
- Pisal, Pooja,Deodhar, Meenakshi,Kale, Amol,Nigade, Ganesh,Pawar, Smita
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- NOVEL BENZOTHIAZOLE DERIVATIVES WITH ENHANCED BIOLOGICAL ACTIVITY
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The present invention discloses novel conjugates of benzothiazole derivatives with cystine and glucosamine and their method of synthesis. Their method of synthesis is easy and eco-friendly, avoiding the use of hazardous materials or reactions, The compounds offer technical advantages of increased solubility, potency, selectivity and biological activity. The novel compounds show antibacterial, antifungal and anticancer activities. Formula, physico-chemical data and biological activity of the novel derivatives are as given in Tables 1 to 9.
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Page/Page column 9-10
(2017/03/08)
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- Novel Piperine Derivatives with Antidiabetic Effect as PPAR-γ Agonists
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Piperine is an alkaloid responsible for the pungency of black pepper. In this study, piperine isolated from Piper nigrum L. was hydrolyzed under basic condition to obtain piperic acid and was used as precursor to carry out the synthesis of twenty piperine derivatives containing benzothiazole moiety. All the benzothiazole derivatives were evaluated for their antidiabetic potential by OGT test followed by assessment of active derivatives on STZ-induced diabetic model. It was observed that nine of twenty novel piperine analogues (5b, 6a-h), showed significantly higher antidiabetic activity in comparison with rosiglitazone (standard). Furthermore, these active derivatives were evaluated for their action as PPAR-γ agonists demonstrating their mechanism of action. The effects on body weight, lipid peroxidation, and hepatotoxicity after administration with active derivatives were also studied to further establish these derivatives as lead molecules for treatment of diabetes with lesser side-effects.
- Kharbanda, Chetna,Alam, Mohammad Sarwar,Hamid, Hinna,Javed, Kalim,Bano, Sameena,Ali, Yakub,Dhulap, Abhijeet,Alam, Perwez,Pasha, M. A. Qadar
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p. 354 - 362
(2016/10/19)
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- Novel 2-(2-(4-aryloxybenzylidene) hydrazinyl)benzothiazole derivatives as anti-tubercular agents
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A series of structurally novel, substituted 2-(2-(4-aryloxybenzylidene) hydrazinyl)benzothiazole derivatives incorporating 2-hydrazinyl benzothiazole and 4-(aryloxy)benzaldehyde were designed and synthesized using molecular hybridization approach. All the synthesized compounds exhibited promising activity (MIC 1.5-29.00 μg/ml) against Mycobacterium tuberculosis H37Rv strains of using REMA. Five of the evaluated compounds exhibit MIC 3.0 μg/ml. Compound (E)-6-chloro-2-(2-(4-(2,4-dichlorophenoxy)benzylidene) hydrazinyl) benzothiazole showed MIC of 1.5 μg/ml. Thus, this compound could act as a potential lead for further development of new anti-tubercular drugs.
- Telvekar, Vikas N.,Bairwa, Vinod Kumar,Satardekar, Kalpana,Bellubi, Anirudh
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scheme or table
p. 649 - 652
(2012/02/04)
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- Synthesis of 1,2,4-triazole derivatives containing benzothiazoles as pharmacologically active molecule
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In attempt to make significant pharmacologically active molecule, we report here the synthesis and in vitro antimicrobial and antitubercular activity of various series of 3-(3-pyridyl)-5-(4-nitrophenyl)-4-(N-substituted-1,3- benzothiazol-2-amino)-4H-1,2,4-triazole. The antimicrobial activity of title compounds were examined against two Gram-positive bacteria (Staphylococcus aureus, Streptococcus pyogenes), two Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa), and three fungi (Candida albicans, Aspergillus niger, Aspergillus clavatus) using the broth microdilution method and antitubercular activity H37Rv using Lowenstein-Jensen agar method.
- Patel, Navin B.,Khan, Imran H.
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p. 527 - 534
(2012/05/20)
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- Antimycobacterial and antimicrobial study of new 1,2,4-triazoles with benzothiazoles
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In this study, we report the antimycobacterial and antimicrobial evaluation of newly synthesized 3-(3-pyridyl)-5-(4-methoxyphenyl)-4-(N-substituted-1,3- benzothiazol-2-amino)-4H-1,2,4-triazole 6a-j in good yields. All the synthesized compounds have been established by elemental analysis, IR, 1H NMR, 13C-NMR and Mass spectral data. In-vitro antimycobacterial activity was carried out against (Mycobacterium tuberculosis) H37Rv strain using Lowenstein-Jensen medium and antimicrobial activity against two Gram positive bacteria (Staphylococcus aureus, Streptococcus pyogenes), two Gram negative bacteria (Escherichia coli, Pseudomonas aeruginosa) and three fungal species (Candida albicans, Aspergillus niger, Aspergillus clavatus) using the broth microdilution method. Compounds 2e, 6a, 6g, 6h, and 6j exhibited promising antimicrobial activity whereas compound 6j showed very good antimycobacterial activity. The antimycobacterial and antimicrobial evaluation of newly synthesized 3-(3-pyridyl)-5-(4-methoxyphenyl)-4-(N-substituted-1,3-benzothiazol- 2-amino)-4H-1,2,4-triazoles is reported in detail. Compounds 2e, 6a, 6g, 6h, and 6j exhibited promising antimicrobial activity whereas compound 6j showed very good antimycobacterial activity. Copyright
- Patel, Navin B.,Khan, Imran H.,Rajani, Smita D.
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p. 692 - 699
(2011/09/15)
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- Pharmacological evaluation and characterizations of newly synthesized 1,2,4-triazoles
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The triazole analogs were obtained via. multistep synthesis sequence beginning with ethyl nicotinoate 3 which on treatment with hydrazine hydrate yields nicotinoyl hydrazide 4. Intermolecular cyclisation of 4 with 4-methylbenzoic acid in presence of phosphorous oxy chloride affords 2-(3-pyridyl)-5-(4-methylphenyl)-1,3,4-oxadiazole 5. Condensation of 5 with various substituted 2-hydrazino benzothiazole 2a-j results in 3-(3-pyridyl)-5-(4-methylphenyl)-4-(N-substituted-1,3-benzothiazol-2-amino) -4H-1,2,4-triazole 6a-j analogs. All the compounds have been characterized by elemental analysis, IR, 1H NMR, 13C NMR and mass spectral data. In vitro antitubercular activity was carried out against Mycobacterium tuberculosis H37Rv strain using Lowenstein-Jensen medium and antimicrobial activity against various bacteria and fungi using broth microdilution method. Compounds 2e, 6a, 6b, 6c, 6d, 6g, 6h and 6i emerged as promising antimicrobials. It was also observed that the promising antimicrobials have proved to be better antituberculars. Compound 6j showed better antitubercular activity compared to rifampicin. 3-(3-Pyridyl)-5-(4-methylphenyl) -4-(N-substituted-1,3-benzothiazol-2-amino)-4H-1,2,4-triazole 6a-j were synthesized and their antitubercular activity against H37Rv and antimicrobial activities have been tested.
- Patel, Navin B.,Khan, Imran H.,Rajani, Smita D.
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experimental part
p. 4293 - 4299
(2010/10/02)
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- Ferulic acid and benzothiazole dimer derivatives with high binding affinity to β-amyloid fibrils
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New ferulic acid and benzothiazole dimer derivatives were synthesized and evaluated by in vitro competition assay using [125I]TZDM for their specific binding affinities to Aβ fibrils. In particular, 4a showed the most excellent binding affinity (Ki = 0.53 nM), compared to PIB (Ki = 0.77 nM), for benzothiazole binding sites of Aβ1-42 fibrils. This result suggests a possibility of a potential AD diagnostic probe for detection of Aβ fibrils.
- Byeon, Seong Rim,Jin, Yun Jung,Lim, Soo Jeong,Lee, Ji Hoon,Yoo, Kyung Ho,Shin, Kye Jung,Oh, Seung Jun,Kim, Dong Jin
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p. 4022 - 4025
(2008/02/07)
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- Novel 2-aminobenzothiazoles as selective neuronal nitric oxide synthase inhibitors
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A series of substituted 2-aminobenzothiazole compounds have been synthesized and evaluated as nitric oxide synthase (NOS) inhibitors. Compound 14 shows activity in the nM range and is selective for the human neuronal NOS isoform. We have also evaluated the compounds against the rat NOS isoforms. For some of the compounds, there are significant differences in NOS inhibitory activities between the human and rat enzymes. For example, compound 10b has nM activity against the rat nNOS while low μM activity against the human nNOS.
- Patman, Joanne,Bhardwaj, Namrta,Ramnauth, Jailall,Annedi, Subhash C.,Renton, Paul,Maddaford, Shawn P.,Rakhit, Suman,Andrews, John S.
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p. 2540 - 2544
(2008/02/01)
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