Synthesis and antimicrobial activity of some new thioether derivatives of quinoxaline

Article abstract of DOI:10.1155/2011/482831

2-Chloro-3-methylquinoxaline was selected as nucleus around which the molecular manipulations were carried out to get new compounds expected to possess better anti microbial activity. Various quinoxaline derivatives have been synthesized by replacing the chlorine at C-2 with a thioether linkage, which in turn attached to 2-(N-(substituted phenyl)acetamides. The synthesized compounds (5) were tested for their antimicrobial activity. Compounds 5b, 5c, 5d and 5i were found most active (comparable to the standard antibacterial Ciprofloxacin) amongst them. The structure of the compounds was confirmed on the basis of their spectral data.

Full text of DOI:10.1155/2011/482831

ISSN: 0973-4945; CODEN ECJHAO
E-Journal of Chemistry
2011, 8(2), 635-642
http://www.e-journals.net
Synthesis and Antimicrobial Activity of
Some New Thioether Derivatives of Quinoxaline
D.C.P.SINGH§*, S.R.HASHIM§ and R.G.SINGHAL
§Department of Pharmaceutical Chemistry
College of Pharmacy, Institute of Foreign Trade and Management
Moradabad - 244001, India
School of Pharmaceutical Sciences
Shobhit University, Meerut, India
drrgsinghal@rediffmail.com
Received 19 September 2010; Accepted 30 October 2010
Abstract: 2-Chloro-3-methylquinoxaline was selected as nucleus around
which the molecular manipulations were carried out to get new compounds
expected to possess better anti microbial activity. Various quinoxaline
derivatives have been synthesized by replacing the chlorine at C-2 with a
thioether linkage, which in turn attached to 2-(N-(substituted
phenyl)acetamides. The synthesized compounds (5) were tested for their
antimicrobial activity. Compounds 5b, 5c, 5d and 5i were found most active
(comparable to the standard antibacterial Ciprofloxacin) amongst them. The
structure of the compounds was confirmed on the basis of their spectral data.
Keywords: Quinoxalines, 2-Chloro-N-(substituted phenyl)acetamides, 2-(2-Methylquinoxalin-3-
ylthio)-N-substituted phenyl)acetamides, Antimicrobial activity.
Introduction
Compounds containing the quinoxaline nucleus exhibit a broad spectrum of biological
activity such as antibacterial1-3, antifungal4,5, antiviral6, anticancer7, antituberculosis8,
antimalarial9 and anti-inflammatory10. Thioethers have also been reported for their
bactericidal, fungicidal, anti-inflammatory anticholestemic, hypolipidemic and neurotropic
activities11,12
,
therefore in continuation of our previous work13 on 2-chloro-3-
methylquinoxaline therefore it was thought worthwhile to synthesize thioether derivatives of
quinoxaline in search of better antimicrobial agents. We have synthesized twelve new
compounds containing thioether linkage.

636
D.C.P.SINGH et al.
Experimental
The chemical synthesis (Scheme 1) was initiated with the reaction of o-phenylenediamine
(1) with ethyl pyruvate in n-butanol to yield 2-hydroxy-3-methyl quinoxaline (2), which on
treatment with POCl3, yielded 2-chloro-3-methylquinoxaline (3). A mixture of the
compound (3) and sodium sulphide in DMF was refluxed to yield 3-methylquinoxalin-2-
thiosodium (4), which on treatment with different N-substituted chloroacetamides afforded
the one-pot synthesis of 2-(2-methylquinoxalin-3-ylthio)-N-substituted phenyl)acetamides
(5a-k). 2-Chloro-N-substituted acetamides (Table 1) were prepared by treating substituted
anilines in glacial acetic acid with chloroacetylchloride, warming on the water bath for half
an hour and then precipitating,
aqueous solution of anhydrous sodium acetate.
2-chloro-N-substituted acetamides by addition of saturated
compound 2-(benzylthio)-3-
A
methylquinoxaline (5l) was also prepared. All these compounds (5a-l) are depicted in Table 2.
N
CH3
NH2
n-butanol
+
CH3COCOOC2H5
Ethylpyruvate
N
H
O
NH2
o-phenylenediamine (1)
3-methylquinoxalin-2(1H)-one (2)
POC l3
N
N
CH3
Cl
CH3
SNa
N
N
Na2S
DMF,Reflux
2-chloro-3-methylquinoxaline (3)
3-methylquinoxalin-2-thiosodium (4)
N
N
CH3
R
R
H2
C
CONH
NHCOCH2Cl
S
2-(2-methylquinoxalin-3-ylthio)
-N-substitutedphenyl)acetamides 5(a-i)
N-substituted-2-chloro-acetamides
Na2S,DMF,Reflux
R=2-Cl;3-Cl;4-Cl;4-Br;4-CH3
4-OCH3 ;3-Cl 4-F;2-CH3 3-CH3;
2-COOCH3
CH3
SNa
N
N
N
3-methylquinoxalin-2-thiosodium (4)
NHCOCH2Cl
S
N-(benzo[d]thiazol-2-yl)-2-chloroacetamide
CH2Cl
N
N
CH3
S
NHCOCH2Cl
H
N
S
Benzylchloride
2-chloro-N-cyclohexyl-
acetamide
O
N
N
N
CH3
H2
2-(2-methylquinoxalin-3-ylthio)-
N-(benzo[d]thiazol-2-yl)acetamide (5j)
N
N
CH3
S
C
S
NH
2-(benzylthio)-3-
methylquinoxaline(5l)
O
2-(2-methylquinoxalin-3-ylthio)-N-cyclohexylacetamide (5k)
Scheme 1

Synthesis and Antimicrobial Activity
637
Table 1. Physical data of 2-chloro-N-(substituted phenyl)acetamides
S.No
1.
Name
Melting point °C Rf value
2-Chloro-N-(2-chlorophenyl)acetamide
2-Chloro-N-(3-chlorophenyl)acetamide
2-Chloro-N(4-chlorophenyl)acetamide
2-Chloro-N-(4-bromophenyl)acetamide
2-Chloro-N-(p-tolyl)acetamide
70-72
78
0.82
0.80
0.75
0.77
0.70
0.86
0.64
0.72
0.90
0.68
0.88
2.
3.
164-166
170-172
160-162
104
4.
5.
6.
2-Chloro-N-(4-methoxyphenyl)acetamide
2-Chloro-N-(3-chloro,4-fluorophenyl)acetamide
2-Chloro-N-(2,3dimethylphenyl)acetamide
methyl 2-(2-chloroacetamido)benzoate
7.
75-77
122-124
78
8
9.
10. N-(Benzo[d]thiazol-2-yl)-2-chloroacetamide.
11. 2-Chloro-N-cyclohexylacetamide
141-142
98
Mobile phase for TLC, ethyl acetate: n-hexane (1:1)
Table 2. Physical data of compounds (5a-l) and its structures
N
N
CH3
H
N
X
R
S
O
General structure of the synthesized compounds
Compounds
X ; R
C6H4 ; 2-Cl
C6H4 ; 3-Cl
C6H4 ; 4-Cl
C6H4 ; 4-Br
Reaction Time
M.P. 0C
Rf value
6 H
6 H
6 H
6 H
5 H
7 H
9 H
6 H
6 H
138
109
144-145
166-167
176
0.90
0.83
0.84
0.80
0.66
0.79
0.81
0.78
0.86
5a.
5b.
5c.
5d.
5e.
5f.
5g.
5h.
5i
C6H4 ; 4-CH3
C6H4 ; 4-OCH3
C6H3 ; 3-Cl, 4-F
C6H3 ; 2- CH3 , 3-CH3
C6H4 ; 2-COOCH3
160
159-160
182-183
130
N
; H
6 H
180
0.57
5j.
S
; H
6 H
2 H
168-169
170-171
0.60
0.80
5k.
5l.
R-X-NHCO = C6H5
Ethanol was used as the recrystallization solvent Mobile phase for TLC, ethyl acetate:
n-hexane (1:1)
The melting points were determined in laboratory melting point apparatus using
capillary method and are uncorrected. The purity of the compounds was checked by thin
layer chromatography using silica gel- G on micro slide glass plates and spots were detected
under iodine vapor. IR spectra were recorded in KBr disk on a Simadzu FTIR- 8400
1
spectrophotometer and H NMR spectra on JEOL FTNMR Spectrometer (300 MHz) using
TMS as an internal standard. All chemical shift values were recorded as δ (ppm).
Synthesis of 3-methylquinoxalin-2-(1H)-one (2)
o-Phenylenediamine (10.8 g, 0.10 M) was dissolved in 300 mL of n-butanol with warming.
ethyl pyruvate [11.6 g (15 mL), 0.10 M] was dissolved in 100 mL of n-butanol separately and

638
D.C.P.SINGH et al.
it was added to former solution with constant stirring. The solution was set aside for 30 min,
and then it was heated for 1 h on water bath. On cooling, the crystals that separated, were
collected by filtration, washed with n-hexane and were purified by recrystallization from
ethanol to yield colorless, needle shaped crystals of 2-hydroxy-3-methyl quinoxaline. Yield
80%, m.p. 246 °C. (Lit. m.p. 245 °C)14. IR (KBr) 3008 cm-1 for (N-H stretching vibration of
2° amide), 2968 cm-1 for (C-H stretching vibration of methyl group), 1665 cm-1 for (C=O
stretching vibration of amide) and 1610 cm-1 for (C=C) multiple bond stretching vibration of
aromatic nucleus).
Synthesis of 2-chloro 3-methylquinoxaline (3)
2-Hydroxy-3-methyl quinoxaline (16.0 g, 0.10 M) in 60 mL of POCl3 was refluxed for 90 min.
Then excess of POCl3 was distilled off and the residue was cooled to room temperature and
added to crushed ice taken in a 1L beaker. The mixture was made alkaline by adding 2%
NaOH solution to isolate the product. The crude product was recrystallized from petroleum
o
ether (40-60 C), to yield the crystals of 2-chloro-3-methyl quinoxaline (3). Yield : 60%,
o
o
m.p. 88 C (Lit. m.p. 86-87 C)15. IR (KBr) data clearly showed the disappearance of C=O
stretching vibration of amide and appearance of C-Cl stretching vibration of aryl halide at
1038.52 cm-1.
Synthesis of 3-methylquinoxalin-2-thiosodium (4)
A mixture of 2-chloro3-methylquinoxaline, (0.9 g, 0.005 M) and sodium sulphide, (0.8 g,
0.005 M) in 10 mL of DMF was refluxed for 1.5 h. The completion of reaction was
indicated by a change in color of reaction mixture from dirty green to complete yellow color.
This compound was prepared separately for each synthesis to follow.
General method of synthesis of 2-chloro-N-(substituted phenyl)-acetamides
Substituted anilines (0.01 M) were dissolved in 10 mL of glacial acetic acid in a clean dry
conical flask. Then chloroacetylchloride (0.015 M) was added drop wise and the mixture
was warmed on a water bath for 15-30 min with occasional swirling. Saturated solution of
anhydrous sodium acetate was added to the warm solution to yield the precipitate on cooling
in an ice bath. The product was filtered, washed well with water and purified by
recrystallization from ethanol. The purity of compounds was validated by monitoring TLC.
N-(benzo[d]thiazol-2-yl)-2-chloroacetamide was synthesized separately. A mixture of
equimolar amounts of 2-aminobenzothiazole (0.1 mole) and chloroacetyl chloride (0.1 mole)
in 30 mL chloroform with anhydrous K2CO3 (0.1 mole) were refluxed for 14 h. After
completion of the reaction (monitored by TLC), excess of solvent was distilled off .The
residue was stirred with water (50 mL) and treated with 5% NaHCO3 (30 mL) solution. The
crude product was filtered washed with water to remove the alkali and recrystallized from
methanol to yield the pale yellow product.
Synthesis of 2-(2-methylquinoxalin-3-ylthio)-N-substituted phenyl)acetamides (5a-k)
3-Methylquinoxalin-2-thiosodium was prepared as described earlier and then equimolar
quantities of pure 2-chloro-N-(substituted phenyl)acetamide were added to the reaction
vessel containing DMF and refluxed further for 6-9 h. The reaction mixture was cooled to
room temperature and added to ice water in a beaker with stirring. The crude product that
separated was filtered, washed well with water, decolorized with activated charcoal and
purified by recrystallization from ethanol.

Synthesis and Antimicrobial Activity
639
2-(Benzylthio)-3-methyl quinoxaline (5l)
Benzyl chloride (0.6 mL, 0.005 M) was added to reaction vessel containing
3-methylquinoxalin-2-thiosodium in DMF and refluxed for 2 h. The mixture was cooled to
room temperature and poured in to ice water in a beaker with stirring to yield the product,
which was filtered, washed with water and recrystallized from ethanol to yield crystals of
2(benzylthio)-3-methylquinoxaline. The purity of compound was validated by m.p.
determination and TLC technique. Physical data of compounds (5a-l) and structures are
shown in the Table 2.
Spectral data of the synthesized compounds (5a-5l)
2-(2-Methylquinoxalin-3-ylthio)-N-(2-chlorophenyl)acetamide (5a)
IR (KBr cm-1): 3280 (N-H), 3040 (C-H), 2960(-CH2-) 1650 (C=O), 1600 (C=N), 1440
1
and 1250 (-C-S-CH2), 1050 (C-Cl) aryl chloride and 640 (CH2-S). H NMR (CDCl3):
δ 2.745 (s,3H,CH3) δ 4.224 (s,2H,CH2 ), δ 6.987-8.345 (m,8H, Ar-H) and at δ 9.166
(s,1H,N-H).
2-(2-Methylquinoxalin-3-ylthio)-N-(3-chlorophenyl)acetamide (5b)
IR (KBr cm-1): 3260 (N-H), 3040 (C-H), 2880(-CH2-), 1660 (C=O), 1600 (C=N), 1420 and
1250 (-C-S-CH2), 1050 (C-Cl) aryl chloride and 680 (CH2-S). 1H NMR (CDCl3): δ 2.839
(s, 3H, CH3), δ 4.065 (s, 2H, CH2), δ 7.218--8.024 (m, 8H, Ar-H) and δ 8.495 (s, 1H, N-H).
2-(2-Methylquinoxalin-3-ylthio)-N-(4-chlorophenyl)acetamide (5c)
IR (KBr cm-1): 3250 (N-H), 3040 (C-H), 2890(-CH2-), 1650 (C=O), 1595 (C=N), 1440
1
and 1250 (-C-S-CH2), 1050 (C-Cl) aryl chloride and 660 (CH2-S). H NMR (CDCl3):
δ 2.737 (s,3H,CH3) ,δ 4.070 (s,2H,CH2 ) ,δ 7.188--8.052 (m,8H, Ar-H) and δ 9.748
(s,1H,N-H).
2-(2-Methylquinoxalin-3-ylthio)-N-(4-bromophenyl)acetamide (5d)
IR (KBr cm-1): 3280 (N-H), 3040 (C-H), 2890(-CH2-), 1650 (C=O), 1600 (C=N), 1440 and
1250 (-C-S-CH2), 1045 (C-Br) aryl bromide and 680 (CH2-S). 1H NMR (CDCl3): δ 2.736
(s,3H,CH3 ), δ 4.067 (s,2H,CH2 ), δ 7.257-8.056 (m,8H, Ar-H) and δ 9.756 (s,1H,N-H).
2-(2-Methylquinoxalin-3-ylthio)-N-p-tolyl acetamide (5e)
IR (KBr cm-1): 3290 (N-H), 3040 (C-H), 2890(-CH2-), 1650 (C=O), 1610 (C=N), 1400 and
1250 (-C-S-CH2) and 680 (CH2-S). 1H NMR (CDCl3) : δ 2.263 and δ 2.319 (d,6H,2CH3),
δ 3.431 (s,2H,CH2), δ 6.694-7.691(m,8H, Ar-H) and δ 8.400 (s,1H,N-H).
2-(2-Methylquinoxalin-3-ylthio)-N-(4-methoxyphenyl)acetamide (5f)
IR (KBr cm-1): 3270 (N-H), 3040 (C-H), 2840(-CH2-), 1650 (C=O), 1600 (C=N), 1400 and
1
1250 (-C-S-CH2), 1250; 1035 (C-O) and 640 (CH2-S). H NMR (CDCl3) : δ 2.738
(s,3H,CH3), δ 3.743(s,3H,OCH3), δ 4.073 (s,2H,CH2 ), δ 6.774-8.042 (m,8H, Ar-H) and δ
9.487 (s,1H,N-H) .
2-(2-Methylquinoxalin-3-ylthio)-N-(3-chloro-4-fluorophenyl)acetamide (5g)
IR (KBr cm-1): 3280 (N-H), 3020 (C-H), 2880(-CH2-), 1670 (C=O), 1600 (C=N), 1440 and
1250 (-C-S-CH2), 1115 (C-F) aryl chloride 1050 (C-Cl) aryl chloride and 680 (CH2-S). 1H
NMR (CDCl3) : δ 2.737 (s,3H,CH3 ) δ 4.062 (s,2H,CH2 ) ,δ 6.964-8.058 (m,7H, Ar-H) and δ
9.776 (s,1H,N-H).

640
D.C.P.SINGH et al.
2-(2-Methylquinoxalin-3-ylthio)-N-(2, 3-dimethylphenyl)acetamide (5h)
IR (KBr cm-1): 3280 (N-H), 3000 (C-H), 2900(-CH2-), 1650 (C=O), 1600 (C=N), 1440 and
1
1250 (-C-S-CH2), and 680 (CH2-S). H NMR (CDCl3): δ 2.755 (s,3H,CH3) , δ 1.905 and
δ 2.198 (d,6H,2CH3), δ 4.179 (s,2H,CH2 ), δ 6.947-8.005 (m,7H, Ar-H) and δ 8.768 (s,1H,
N-H). MS: m/z 338 (M+ +1)
Methyl-2-(2-(2-methylquinoxalin-3-ylthio) acetamide)benzoate (5i)
IR (KBr cm-1): 3280 (N-H), 2960 (C-H), 2900(-CH2-), 1680 (C=O), 1600 (C=N), 1440 and 1250
(-C-S-CH2), 1270; 1115 (C-O) and 700 (CH2-S).1H NMR (CDCl3) : δ 2.794 (s,3H,CH3 ), δ 3.760
(s,3H,OCH3), δ 4.278 (s,2H,CH2 ), δ 7.026-8.690 (m,8H, Ar-H) and δ 11.631 (s,1H,N-H).
2-(2-Methylquinoxalin-3-ylthio)-N-(benzo[d]thiazol-2-yl)acetamide (5j)
IR (KBr cm-1): 3260 (N-H), 3040 (C-H), 2900(-CH2-), 1700 (C=O), 1600 (C=N), 1440 and
1250 (-C-S-CH2), 740 (Benzothiazole ring) and 690 (CH2-S). 1H NMR (CDCl3) : δ 2.739
(s,3H,CH3 ), δ 4.191 (s,2H,CH2 ), δ 7.261-8.143 (m,8H, Ar-H) and δ 11.303 (s,1H,N-H).
2-(2-Methylquinoxalin-3-ylthio) –N-cyclohexylacetamide (5k)
IR (KBr cm-1): 3280 (N-H), 2960 (C-H), 2900(-CH2-), 1640 (C=O), 1550 (C=N), 1440 and 1250
(-C-S-CH2), and 720 (CH2-S)1H NMR (CDCl3): δ 1.005-1.841 (m,10H,C6H10), δ 2.838 (s,3H,CH3 ),
δ 3.722-3.748(t,1H,CH-) , δ 3.927 (s,2H,CH2) δ 7.144-7.986 (m,4H, Ar-H) and δ 8.011 (s,1H,N-H).
2-(Benzylthio)-3-methylquinoxaline (5l)
IR (KBr cm-1): 2960 (C-H),), 2900(-CH2-), 1600 (C=N), 1440 and 1250 (-C-S-CH2) and 720
(CH2-S). 1H NMR (CDCl3): δ 2.834 (s, 3H, CH3), δ 4.065 (s, 2H, CH2) and δ 7.260-8.051
(m, 9H, Ar-H).
Antibacterial activity
The antibacterial activity was assayed by agar plate disc diffusion method16 at the
concentration of 50 µg per disk. All the synthesized compounds were tested in vitro for their
antibacterial activity against gram positive microorganisms such as Staphylococcus aureus
(NCIM 2079), Bacillus subtilis (NCIM 2439) and gram negative Escherichia coli (NCIM
2831), Pseudomonas aerugenosa (NCIM 2863) strains. Each test compounds were dissolved
in dimethyl sulphoxide (DMSO) to get a concentration of 10 mg/mL. The disc (6 mm in
diameter) was impregnated with 5 µL of each test solution to get 50 µg/disc, air dried and
placed on the agar medium, previously seeded with 0.2 mL of broth culture of each
organism for 18 h. The plates were incubated at 37 0C for 24 h and the inhibition zones were
measured in mm. Discs impregnated with DMSO were used as a control and ciprofloxacin
discs as antibacterial reference standard.
Antifungal activity
The antifungal activity17 was assayed by sabouraud dextrose agar media plate disc diffusion
method at the concentration of 50 µg per disk. All the synthesized compounds were tested
in vitro for their antifungal activity against microorganisms such as Asperagellus niger
(NCIM 618) and Candida albicans (NCIM 3557). Each test compound was dissolved in
dimethyl sulphoxide (DMSO) to get a concentration of 10 mg/mL. The disc (6 mm in
diameter) was impregnated with 5 µL of each test solution to get 50 µg/disc; air dried and
placed on the sabouraud dextrose agar media, previously seeded with 0.2 mL of broth
0
culture of each organism for 18 h. The plates were incubated at 22 C for 48 h and the
inhibition zones were measured in mm .Discs impregnated with DMSO were used as a
control and fluconazole discs as antifungal reference standard.

Synthesis and Antimicrobial Activity
641
Results and Discussion
The IR spectra of compounds (5a-k) showed bands at 3280 cm-1 (N-H ) stretching vibration
for secondary amides, at 2920 cm-1 (-CH2)- stretching vibration, at 1650-1700 cm-1 (C=O)
stretching vibration for amides, at 1440-1250cm-1 (-C-S-CH2-) stretching vibration and at
640 cm-1 (-C-S-) stretching vibration. The 1H NMR spectra also confirmed this synthesis by
1
showing δ values for various hydrogens. The H NMR spectra revealed a singlet at δ 2.838
for CH3 of quinoxaline ring, a singlet at δ 3.900-4.300 for(-S–CH2-),a singlet at δ 8.000-9.700
for secondary (N-H) and multiplets at δ 6.900-8.000 for aromatic hydrogens. The attachment
of various substituent groups in the synthesized compounds were also validated by their
1
respective IR and H NMR spectra. The mass spectrum of compound (5h) has further
validated the structure of this compound.
Antibacterial activity
The antibacterial activity was determined by the disc diffusion method at the concentration of
50 µg per disk. All the synthesized compounds were tested in vitro for their antibacterial
activity against gram positive microorganisms such as Staphylococcus aureus (NCIM 2079),
Bacillus subtilis (NCIM 2439), Escherichia coli (NCIM 2831), Pseudomonas
aerugenosa(NCIM 2863) (gram negative), using ciprofloxacin as standard antibacterial. The
results of activity, presented in the Table 3 suggested that the compounds 5a, 5c, 5d, 5h, 5i, 5j,
5k and 5l were highly active where as compounds 5b, 5e, 5f and 5g were moderately active
against microorganism S. aureus. The compound 5b only was found highly active and rest of
the compounds was found moderately active against B. subtilis. The compounds 5j and 5k
were found highly active and rest moderately active against microorganism E.coli. The activity
of the compounds 5b, 5c, 5d and 5i were found most active, (comparable to standard
antibacterial ciprofloxacin), 5j moderately active whereas compounds 5a, 5e, 5f, 5h and 5l
were found inactive against microorganism P.aerugenosa (Table 3).
Table 3. Results of antimicrobial activity
Zone of Inhibition
S. aureus B. subtilis E.coli. P.aerugenosa A.niger C.albican
Compounds
+++
++
++
+++
++
++
++
++
++
++
++
++
++
++
+++
++
++
-
+++
+++
+++
-
++
++
++
++
++
++
++
++
-
-
-
5a.
5b.
+++
+++
++
++
++
++
++
-
5c.
5d.
5e.
5f.
-
++
++
+++
++
-
++
++
-
++
++
+++
-
5g.
5h.
+++
+++
+++
+++
+++
+++
++
+++
++
++
-
5i.
5j.
5k.
5l.
+++
+++
++
+++
++
++
+++
+++
++
Ciprofloxacin
Fluconazole
+++
+++
‘-‘ Inactive (inhibition zone < 6 mm); slightly active = ‘+’ (inhibition zone 7-9 mm); moderately
active = ‘++’ (inhibition zone 10-13 mm); highly active = ‘+++’ (inhibition zone > 14 mm).

642
D.C.P.SINGH et al.
Antifungal activity
The antibacterial activity was determined by the disc diffusion method at the concentration of 50
µg per disk. All the synthesized compounds were tested in vitro for their antifungal activity
against microorganisms such as Asperagellus niger and Candida albicans, using fluconazole as
standard antifungal. The compound 5j was highly active against both microorganisms
Asperagellus niger (NCIM 618) and Candida albicans (NCIM 3557). Compounds 5g and 5k
were highly active where as compounds 5a, 5b, 5c, 5d and 5i were inactive against Candida
albicans while rest of the compounds showed moderate activity against Asperagellus niger.
Conclusion
A series of the compounds (5a-5l) were synthesized and tested for antimicrobial activity, the
compound 5b, 5c, 5d and 5i were found most active (comparable to standard antibacterial
Ciprofloxacin) against P.aerugenosa. The compound 5j was highly active against both
microorganisms Asperagellus niger and Candida albicans when compared to Fluconazole as
standard antifungal agent.
Acknowledgment
The authors are thankful to Director, College of Pharmacy and Managing Director, I.F.T.M.
Moradabad for providing research facilities. We extend our thanks to Director, National Collection
of Industrial Microorganisms, National Chemical Laboratory, Pune for providing microbial strains.
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