scholarly journals Synthesis of certain pyrrole derivatives as antimicro-bial agents

2009 ◽  
Vol 59 (2) ◽  
pp. 145-158 ◽  
Author(s):  
Mosaad Mohamed ◽  
Ramdan El-Domany ◽  
Rania Abd El-Hameed
Keyword(s):  
Antimicrobial Activity ◽  
Aromatic Amines ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Pyrrole Derivatives ◽  
Gram Negative ◽  
Primary Aromatic Amines ◽  
Aryl Amines ◽  
Bacteria And Fungi

Synthesis of certain pyrrole derivatives as antimicro-bial agentsIn an effort to establish new pyrroles and pyrrolo[2,3-d] pyrimidines with improved antimicrobial activity we report here the synthesis andin vitromicrobiological evaluation of a series of pyrrole derivatives. A series of new 2-aminopyrrole-3-carbonitriles (1a-d) were synthesized from the reaction of benzoin, primary aromatic amines and malononitrile, from which a number of pyrrole derivatives (2a-dto5a-d) and pyrrolo[2,3-d]pyrimidines (6a-dto10a, d) were synthesized. Thein vitroantimicrobial testing of the synthesized compounds was carried out against Gram-positive, Gram-negative bacteria and fungi. Some of the prepared compounds, [2-amino-1-(2-methylphenyl)-4,5-diphenyl-1H-pyrrole-3-carbonitriles (1b), 2-amino-3-carbamoyl-1-(3-methylphenyl)-4,5-diphenyl-1H-pyrroles (2b),N-(3-cyano-1-(2-methylphenyl)-4,5-diphenyl-1H-pyrrol-2-yl)-acetamides (3b),N-(3-cyano-1-(3-methylphenyl)-4,5-diphenyl-1H-pyrrol-2-yl)-acetamides (3c), 2-amino-1-(4-methoxyphenyl)-4,5-diphenyl-3-tetrazolo-1H-pyrroles (5d),7-(4-methoxyphenyl)-5,6-diphenyl-7H-pyrrolo [2,3-d]pyrimidin-4(3H)-ones (7d), 7-(3-methylphenyl)-5,6-diphenyl-7H-pyrrolo[2,3-d]pyrimidin-4(3H)-thione (9b) andN-(7-(2-methylphenyl)-5,6-diphenyl-7H-pyrrolo[2,3-d] pyrimidine)-N-aryl amines (10a)] showed potent antimicrobial activity.

scholarly journals Synthesis, antioxidant and antimicrobial activity of carbohydrazones

2017 ◽  
Vol 82 (5) ◽  
pp. 495-508 ◽  
Author(s):  
Aleksandra Bozic ◽  
Nenad Filipovic ◽  
Irena Novakovic ◽  
Snezana Bjelogrlic ◽  
Jasmina Nikolic ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Antioxidant Activity ◽  
Dimethyl Sulphoxide ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Gram Negative ◽  
Antioxidant Compound ◽  
Antioxidant And Antimicrobial Activity ◽  
Bacteria And Fungi

Fourteen mono- and bis-carbohydrazone ligands have been synthesized and characterized. Antioxidant activity of the substances was investigated together with possible (E)/(Z) isomerization, and explained on the most active antioxidant compound 4 in various dimethyl sulphoxide?water mixtures. The addition of water to the system was involved in the formation of hydrated molecules which was confirmed in NMR after the addition of D2O. The ligands were tested in vitro against Gram-positive and Gram-negative bacteria and fungi, and their activity was discussed in relation to the structure of investigated carbohydrazone.

scholarly journals Synthesis and Preliminary Biological Activity Evaluation of New N- Substituted Phthalimide Derivatives

2020 ◽  
Vol 29 (1) ◽  
pp. 247-252
Author(s):  
Halah A. Sahib ◽  
Mohammed H. Mohammed
Keyword(s):  
Antimicrobial Activity ◽  
Methyl Ester ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Gram Negative ◽  
Gram Positive Bacteria ◽  
Ft Ir ◽  
Bacteria And Fungi ◽  
Phenylalanine Methyl Ester

A A new series of bases of Schiff (H2-H4) derived from phthalic anhydrideweresynthesized. These Schiff bases were prepared by the reaction of different amines (tyrosine methyl ester, phenylalanine methyl ester, and isoniazid) with the phthalimide derived aldehyde with the aid of glacial acetic acid or triethylamine ascatalysts. All the synthesized compounds were characterized by (FT-IR and 1HNMR) analyses and were in vitro evaluated for their antimicrobial activity against six various kinds of microorganisms. All the synthesized compounds had been screened for their antimicrobial activity against two Gram-positive bacteria “Staph. Aureus, and Bacillus subtilis”, two Gram-negative bacteria “Escherichia coli, and Klebsiella pneumoniae”, and two fungi species “Candida tropicalis and Candida albicans” using concentrations of 62.5, 125 and 250 µg\mLof derivative in dimethyl sulfoxide(DMSO). All the synthesized compounds showed no activity at all against Gram-positive bacteria, for Gram-negative bacteria and fungi they showed moderate or no activity except compound H1revealedhigh antifungal activityagainstCandida tropicalisat concentrations 125 and 250 µg\ mL. Keywords: Schiff base, phthalic anhydride, antimicrobial.  

scholarly journals Synthesis and Evaluation of Some Coumarin Containing Potential Antimicrobial Agents

2012 ◽  
Vol 9 (4) ◽  
pp. 2493-2500
Author(s):  
Sayali D. Kudale ◽  
Meenakshi N. Deodhar
Keyword(s):  
Antimicrobial Activity ◽  
Antimicrobial Agents ◽  
Gram Negative Bacteria ◽  
Schiff’S Bases ◽  
Gram Positive ◽  
Gram Negative ◽  
H Nmr ◽  
Nmr Data ◽  
Bacteria And Fungi

A series of the Schiff’s bases incorporating coumarin and chalcone moeities, 3-(4-(4-(substituted phenyl)prop-1-ene-3-one) phenylimino) methyl)-4-chloro-2h-chromen-2-one 4(a-g) were synthesized as potential antimicrobial agents. These compounds were characterized on the basis of their spectral (IR,1H NMR) data and evaluated for antimicrobial activity in vitro against gram positive and gram negative bacteria and fungi. Compound 4b was found to be most active with an MIC of 20 µg/mL against all the tested organisms.

scholarly journals Synthesis and Evaluation of Some Coumarin Based Schiff's Bases as Potential Antimicrobial Agents'

2012 ◽  
Vol 9 (4) ◽  
pp. 2079-2088 ◽  
Author(s):  
Vishakha Bansode ◽  
Meenakshi N. Deodhar
Keyword(s):  
Antimicrobial Activity ◽  
Antimicrobial Agents ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Gram Negative ◽  
Gram Positive Bacteria ◽  
H Nmr ◽  
Nmr Data ◽  
Bacteria And Fungi

A series of the title compounds 3-(4-(4, 5-dihydro-5-(substituted phenyl)-1H-3-pyrazolyl) phenylimino) methyl)-4-chloro-2H-chromen-2-one 5(a-g) have been synthesized. These compounds were characterized on the basis of their spectral (IR,1H NMR) data and evaluated for antimicrobial activityin vitroagainst gram positive bacteria, gram negative bacteria and fungi. The compound (5b) was found to be the most active with MIC of 20 µg/ml against all the tested organisms.

scholarly journals Design, Synthesis and Evaluation of Schiff’s Bases of 4-Chloro-3-coumarin aldehyde as Antimicrobial Agents

2009 ◽  
Vol 6 (3) ◽  
pp. 759-762 ◽  
Author(s):  
Shriram Bairagi ◽  
Ashok Bhosale ◽  
Meenakshi N. Deodhar
Keyword(s):  
Antimicrobial Activity ◽  
Antimicrobial Agents ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Design Synthesis ◽  
Gram Negative ◽  
H Nmr ◽  
Nmr Data ◽  
Bacteria And Fungi

4-Chloro-2-oxo-2H-chromene-3-carbaldehyde(2)was reacted with different anilines in rectified spirit as solvent to yield a series of the title compoundsi.e. 4-chloro-3-((substituted-phenylimino) methyl)-2H-chromen-2-one(3a-i). These compounds were charaterised on the basis of their spectral (IR,1H NMR) data and evaluated for antimicrobial activityin vitroagainst gram positive and gram negative bacteria and fungi. Compound3Cwas found to be most active with an MIC of 15 μg /mL against all the tested organisms.

Environmentally benign one-pot synthesis and antimicrobial activity of 1-methyl-2,6-diarylpiperidin-4-ones

2011 ◽  
Vol 65 (5) ◽  
Author(s):  
Pattusamy Nithya ◽  
Fazlur-Rahman Nawaz Khan ◽  
Selvaraj Roopan ◽  
Uma Shankar ◽  
Jong Jin
Keyword(s):  
Antimicrobial Activity ◽  
Environmentally Benign ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
One Pot ◽  
Gram Negative ◽  
One Pot Synthesis ◽  
Bacteria And Fungi

AbstractAn efficient and environmentally benign one-pot method for the synthesis of 1-methyl-2,6-diarylpiperidin-4-ones using montmorillonite K-10 as a catalyst has been developed. Antimicrobial activity of the compounds has been tested against selected representatives of Gram-positive and Gram-negative bacteria and fungi.

scholarly journals Didymocarpous Pedicellatus R. Br.: Qualitative and Quantitative GCMS Approach for Quality Control in Traditional Poly-Herbal Formulation with In Vitro Antioxidant and Antimicrobial Activity

2019 ◽  
Vol 35 (2) ◽  
pp. 648-657 ◽  
Author(s):  
Wasim Ahmad ◽  
Ennus T. Tamboli ◽  
Abuzer Ali ◽  
Mohd Amir ◽  
S. M. A. Zaidi ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Antioxidant Activity ◽  
Diffusion Method ◽  
Gram Negative Bacteria ◽  
Good Precision ◽  
Gram Negative ◽  
Herbal Formulation ◽  
Antioxidant And Antimicrobial Activity ◽  
Bacteria And Fungi

A Gas Chromatography and Maas Spectroscopy method was developed and validated for determination and identification of α-humulene in a traditional medicinal herb Didymocarpous pedicellatus R. Br. (DP) (Gesneriaceae) and its poly herbal formulation, Safoof-e-pathar phori (SPP) including their essential oil. Hydrodistillation method were used for the isolation of essential oils from the leaves of DP and SPP herbal formulation. The proposed analysis method was found to be linear r2 = 0.999 in a wide concentration range (0.1-1000 µgmL-1), with good precision (RSD < 2.0%). Antimicrobial activity of α-humulene, DP and SPP oil was assessed by using agar well diffusion method against clinically important Gram-positive, Gram-negative bacteria and fungi. α-Humulene was found to be more active in contrast to Gram-negative bacteria while DP oil and SPP oil were exhibited maximum inhibition against fungal strains. Antioxidant activity of α-humulene, DP oil and SPP oil were determined using 2, 2-diphenyl-1-picryl hydrazyl radical (DPPH) 96 well plate method, which showed antioxidant activity in the following order: standard ascorbic acid (DPPH FRS50 = 2.40 µg) > DP oil (DPPH FRS50 = 3.68 µg) > SPP oil (DPPH FRS50 = 12.54 µg) > and α-humulene (DPPH FRS50 = 36.19 µg).

scholarly journals Chemical Composition and in vitro Antimicrobial Activity of the Essential Oil of the Flowers of Tridax procumbens

2012 ◽  
Vol 7 (7) ◽  
pp. 1934578X1200700 ◽  
Author(s):  
Rajesh K. Joshi ◽  
Vijaylaxmi Badakar
Keyword(s):  
Gas Chromatography ◽  
Antimicrobial Activity ◽  
Essential Oil ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Gram Negative ◽  
Gram Positive Bacteria ◽  
Flame Ionization ◽  
Tridax Procumbens

The essential oil of the flowers of Tridax procumbens L. was obtained by hydro-distillation and analyzed by gas chromatography equipped with a flame ionization detector (GC-FID) and gas chromatography coupled with mass spectrometry (GC/MS). Twenty-six compounds were identified, which comprised 90.6% of the total constituents. The most abundant compound was ( Z)-falcarinol (25.9%), followed by α-selinene (15.3%), limonene (8.3%) and zerumbone (4.3%). Antimicrobial activity was tested against six Gram-positive and eight Gram-negative bacteria, and three fungi. The oil was active against the tested Gram-positive bacteria at a concentration range of 0.14 ± 0.03 - 0.57±0.05 mg/mL, while 0.67 ± 0.12 - 4.58 ± 0.41 mg/mL was effective against the studied Gram-negative bacteria. Remarkable antifungal activity was found against the tested fungi at a concentration range of 0.06 ± 0.008 - 0.10 ± 0.01 mg/mL.

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