Synthesis and evaluation of some novel derivatives of 2- propoxybenzylideneisonicotinohydrazide for their potential antimicrobial activity

Article abstract of DOI:10.2298/JSC110310170M

A novel series of Mannich bases containing isoniazid were prepared. First, reaction of 2-propoxybenzaldehyde with isoniazid gave the corresponding hydrazone (2a). Subsequently, product 2a after the Mannich reaction of aminomethylation with formaldehyde and secondary amines gave 2b-k. The inhibitory potencies of the synthesized compounds were assayed in vitro against a panel of microorganisms and against the A549 human lung adenocarcinoma cell line. Compounds 2c and 2k displayed moderate to potent antimicrobial activity against all the tested strains and they also exhibited significant cytotoxicity in a dose-dependent manner with IC50 values ranging from 2.84 to 8.55 μg/mL and 0.007-0.030 mM. The structures of the newly synthesized compounds were evaluated by elemental and spectral (IR, 1H-NMR, 13C-NMR) methods. The results demonstrated the potential and importance of developing new Mannich bases which would be effective against resistant microbial strains and may be useful leads for anticancer drug development in the future. 2012 Copyright (CC) SCS.

Full text of DOI:10.2298/JSC110310170M

J. Serb. Chem. Soc. 77 (5) 589–597 (2012)
JSCS–4292
UDC 547.588.18+547.233+547–316+
547.281.1:615.28:615.277
Original scientific paper
Synthesis and evaluation of some novel derivatives of
2-propoxybenzylideneisonicotinohydrazide for their
potential antimicrobial activity
MANAV MALHOTRA1, MANU ARORA2, ABDUL SAMAD3, KAPENDRA SAHU4,
5
6
*
PRIYANKA PHOGAT and AAKASH DEEP
1Department of Pharmaceutical Chemistry, Meerut Institute of Engineering and Technology,
Bypass Road-Baghpat Crossing, Meerut-250005, Uttar Pradesh, India, 2Institute of Pharmacy
and Emerging Sciences, Baddi University, Baddi-173205, India, 3Department of Pharma-
ceutical Chemistry, College of Pharmacy in Al-Kharj, King Saud University, Riyadh, Saudi
Arabia, 4Department of Pharmaceutical Sciences, Rajiv Gandhi Technical University, Bho-
pal-462033, India, 5Department of Pharmaceutical Sciences, Hindu College of Pharmacy,
Sonepat-131001, India and 6Department of Pharmaceutical Sciences,
Maharshi Dayanand University, Rohtak-124001, India
(Received 10 March, revised 18 June 2011)
Abstract: A novel series of Mannich bases containing isoniazid were prepared.
First, reaction of 2-propoxybenzaldehyde with isoniazid gave the correspond-
ing hydrazone (2a). Subsequently, product 2a after the Mannich reaction of
aminomethylation with formaldehyde and secondary amines gave 2b–k. The
inhibitory potencies of the synthesized compounds were assayed in vitro against
a panel of microorganisms and against the A549 human lung adenocarcinoma
cell line. Compounds 2c and 2k displayed moderate to potent antimicrobial
activity against all the tested strains and they also exhibited significant cyto-
toxicity in a dose-dependent manner with IC50 values ranging from 2.84 to 8.55
µg/mL and 0.007–0.030 mM. The structures of the newly synthesized com-
1
pounds were evaluated by elemental and spectral (IR, H-NMR, 13C-NMR)
methods. The results demonstrated the potential and importance of developing
new Mannich bases which would be effective against resistant microbial strains
and may be useful leads for anticancer drug development in the future.
1
Keywords: benzylidene; antimicrobial; cytotoxicity; Mannich bases; H-NMR;
13C-NMR.
INTRODUCTION
The incidence of microbial infections has increased to startling levels world-
wide in the last 25 years because of antimicrobial resistance. The hasty develop-
*Corresponding author. E-mail: aakashdeep82@gmail.com
doi: 10.2298/JSC110310170M
589
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ment of resistance to existing antibacterial and antifungal drugs poses a major
threat to public health and generates a serious challenge to the scientific commu-
nity. The increasing number of immuno-compromised patients as a result of can-
cer chemotherapy, organ transplantation and HIV infection are the major factors
contributing to this increase. Consequently, there is a vital need for the develop-
ment of new antimicrobial agents having potent activity against the resistant mic-
2–5
roorganism.
Hydrazones belong to the Schiff base family containing azome-
thine –NHN=CH– protons and the hydrazone moiety is considered one of the pri-
vileged structural fragments in modern medicinal chemistry due to its broad
pharmacological vistas. Among the important pharmacophores responsible for
antimicrobial activity, the hydrazone group is still considered a viable lead struc-
ture for the synthesis of more efficacious and broad-spectrum antimicrobial agents.
Some widely used antibacterial drugs, such as nitrofurazone, furazolidone and
ftivazide, contain the hydrazone group. Furthermore, pharmacokinetic and
cellular permeability of a drug can be increased by derivatization to a biorever-
sible form of this drug, namely hydrazone. It is believed that the hydrazone
functional group increases the lipophilicity of the parent amine and amides,
which results in an enhancement of absorption through biomembranes and it is
this enhanced lipophilicity of hydrazones which enables them to cross bacterial
6,7
and fungal membranes. Hydrazones are formed when hydrazines react with an
aldehyde or a ketone under specific condition. Hydrazones have been reported to
8,9
10,11
12
13
possess antimicrobial,
antitubercular,
antileprotic, anticonvulsant,
14
15,16
17
18,19
analgesic, anti-inflammatory,
antiplatelet, anticancer
and antiviral
20
properties.
Inspired by the above facts and in continuation of an ongoing research pro-
gram in the field of the synthesis and antimicrobial activity of medicinally impor-
21–24
tant compounds,
the synthesis and antimicrobial activity of some novel deri-
vatives of isoniazid are reported herein.
EXPERIMENTAL
Melting points of the synthesized compounds were determined in open-glass capillaries
on a Stuart SMP10 melting point apparatus and are uncorrected. The purity of the compounds
was checked by thin layer chromatography (TLC). Silica gel plates 0.25 mm, 60 GF254, pre-
coated sheets, obtained from Merck, Darmstadt (Germany), were used for the TLC and the
spots were visualized by iodine vapor or ultraviolet light as visualizing agents. The infrared
(IR) spectra were obtained on a Perkin-Elmer 1600 FTIR spectrometer in KBr pellets. The
nuclear magnetic resonance (NMR) spectra were recorded in deuterated dimethyl sulfoxide
(DMSO-d6) solutions using tetramethylsilane as the internal reference. A Varian-Mercury 300
1
MHz spectrometer was used for recording the H-NMR spectra while the 13C-NMR spectra
were acquired on a Bruker Avance II 400 spectrometer. Elemental analyses were performed
on an ECS 4010 elemental combustion system. The necessary chemicals were purchased from
Loba Chemie, Fluka and Sigma-Aldrich.
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ANTIMICROBIAL ACTIVITY OF ISONIAZID DERIVATIVES
591
Synthesis of 2-propoxybenzylideneisonicotinohydrazide.
A mixture of 2-propoxybenzaldehyde (1.64 g, 0.010 mol) and isoniazid (1.37 g, 0.010
mol) in 15 ml of super dry ethanol was refluxed for 5 h. Completion of the reaction was
confirmed by thin layer chromatography (TLC). The reaction mixture was then poured into
ice-cold water and the obtained precipitate was filtered and dried in oven at a low temperature.
The product was recrystallized from absolute ethanol.
Synthesis of substituted Mannich bases (2b–k)
2-Propoxybenzylideneisonicotinohydrazide (1) (679 mg, 0.0024 mol), formaldehyde
(0.10 ml, 0.0036 mol) and the required substituted secondary amine (0.0024 mol) were placed
in 100 ml round-bottom flask to which 50 ml of super dry ethanol was added, the pH was
adjusted to 4 with hydrochloric acid and the mixture was refluxed for 28–33 h. Completion of
the reaction was confirmed by TLC. The reaction mixture was allowed to cool to room tem-
perature and then diethyl ether was added. The reaction mixture was kept for 3–5 h in a
refrigerator. The resulting solid was filtered off and washed with n-hexane. The products were
recrystallized from absolute ethanol.
Antimicrobial evaluation
The synthesized compounds were evaluated for their in vitro antimicrobial activity
against the Gram-positive bacteria Staphylococcus aureus (MTCC 96), Bacillus subtilis
(MTCC 121), Gram-negative Escherichia coli (MTCC 40), Pseudomonas aeruginosa (MTCC
2453) and the fungal strains Candida albicans (MTCC 227) and Aspergillus niger (MTCC
8189). The antimicrobial activity was assessed by the serial two-fold dilution technique.
Amoxicillin was used as the standard drug for the antibacterial activity and nystatin was used
as the standard drug for the antifungal activity. All the compounds were dissolved in dimethyl
sulfoxide (DMSO) to give a concentration of 100 µg mL-1. Twofold dilutions of the test and
standard compounds were prepared in double strength nutrient broth for bacteria (Indian
Pharmacopoeia: peptone 10 g, meat extracts 10 g, sodium chloride 0.5 g, distilled water 1000
mL, and pH 7.2±0.2) or Sabouraud dextrose broth for fungi (Indian Pharmacopoeia)25. The
stock solutions were serially diluted to give concentrations of 50–0.78 µg mL-1 in the res-
pective nutrient broth. The inoculum size was approximately 106 colony forming units (CFU)
mL-1. The tubes were incubated at 37±1 °C for 24 h (bacteria) and 25 °C for 7 d (A. niger)
and 37±1 °C for 48 h (C. albicans). After incubation, the inoculated culture tubes were
macroscopically examined for turbidity. The culture tube showing turbidity (lower concen-
tration) and the culture tube showing no turbidity (higher concentration) gave the minimum
inhibitory concentration (MIC) for the compound.
Cytotoxicity studies
The A549 (human lung adenocarcinoma) cell line was obtained from the National Centre
for Cell Science, Pune, India. The cells were grown in Dulbecco's modified Eagle medium
(DMEM) supplemented with 2 mmol L-1 L-glutamine, 10 % fetal bovine serum (FBS), peni-
cillin (50 IU mL-1) and streptomycin (50 mg mL-1) at a temperature of 37 °C in a humidified
incubator with a 5 % CO2 atmosphere. Gemcitabine, a well known anticancer drug, was used
as the positive control for comparison.26 The viability of the cells was assessed by the MTT
2-(5-dimethylthiazol-2-yl)-3,5-diphenyl-2H-tetrazolium bromide) assay, which is based on the
reduction of MTT by the mitochondrial dehydrogenase of intact cells to a purple formazan
product.27 Cells (1×104) were placed in a 96-well plate. After 24 h, they were treated with
different concentrations (0–25 µg/mL) of the test compounds diluted appropriately with cul-
ture media for 48 h. Cells grown in media containing an equivalent amount of DMSO served
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as the positive control and cells in medium without any supplementation were used as the
negative control. After the treatment, the media containing the compounds were carefully
removed. MTT in phosphate-buffered saline (PBS, 100 μL, 0.40 mg mL-1) was added to each
well and incubated in the dark for 4 h. Then DMSO (100 μL) was added to each well and kept
in an incubator for 4 h for dissolution of the formed formazan crystals. The amount of
formazan was determined by measuring the absorbance at 540 nm using an ELISA plate
reader. The data are presented as percent post treatment recovery (% of live cells), whereas the
absorbance from non-treated control cells was defined as 100 % live cells.
RESULT AND DISCUSSION
The synthesis of target compounds were carried as outlined in the Scheme 1.
An equimolar quantity of 2-propoxybenzaldehyde and isoniazid in 15 ml of abso-
lute ethanol was refluxed for 7 h to form acid hydrazone. The completion of reac-
tion was confirmed by thin layer chromatography (TLC). Then 2-propoxybenzyl-
ideneisonicotinohydrazide along with formaldehyde and secondary amines was
refluxed for 34–42 h in presence of 50 ml of super dry ethanol and the pH was
adjusted to 4 with hydrochloric acid. The employed secondary amines are
specified in Table I.
CH3
CH3
O
O
O
C
O
O
H
C2H5OH
N
NH
NH2
C NH N
C
H
N
+
Isoniazid
2-propoxybenzaldehyde
2-propoxybenzylidene isonicotinohydrazide
(2a)
R
HCHO
NH
R'
CH3
R
O
N
O
R'
C NH N
C
H
N
Substituted Mannich bases(2b-2k)
Scheme 1. General synthetic pathway for the formation of the title compounds.
The purity of the compounds was checked by TLC and they were characte-
1
13
rized by elemental analysis and IR, H- and C-NMR spectroscopy. The results
of the elemental analyses and the spectral data are given in the Supplementary
data to this paper.
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ANTIMICROBIAL ACTIVITY OF ISONIAZID DERIVATIVES
593
In general, the IR spectra of all compounds 2a–k showed absorption band in
the 3279–3255, 2978–2946, 2862–2835, 1677–1663, 1659–1641, 1581–1552,
–1
1174–1125 and 1079–1038 cm regions, conforming the presence of NH, CH,
CH , C=N, C=O, C=C and C–N, respectively. The structures of the prepared de-
2
1
rivatives were confirmed by their H-NMR spectrum based on the chemical shifts,
multiplicities, and coupling constants. The spectra of most compounds showed
the characteristic NH proton at δ 11.98–11.79 ppm, the proton of –N=C–H at δ
8.79–8.21 ppm, the 4 protons of pyridine at around δ 8.86–7.46 ppm, the cha-
racteristic protons of benzylidene at δ 7.77–6.78 ppm, the 2 protons of Ar–O–
–CH at δ 3.94–3.62 ppm and the 2 protons of Ar–CH –N at δ 3.69–3.49 ppm,
2
2
13
The C-NMR spectra of most compounds had characteristic signals of C=O at
around δ 163.91–163.18 ppm, of pyridine at δ 149.88–122.15 ppm, of the –N=C–H
group at δ 143.48–143.19 ppm, of benzylidene at δ 157.58–115.75 ppm and of
Ar–O–CH at δ 72.84–72.19 ppm and Ar–CH –N at δ 55.89–45.59 ppm.
2
2
TABLE I. Structure and physical data of the synthesized Mannich bases
CH3
O
R
O
C NH N
C
H
N
Compound
R
Molecular formulae
Yield, %
M.p., °C
2b
2c
2d
2e
2f
–N(CH3)2
–N(C2H5)2
–N(C3H7)2
–N(C4H9)2
–N(C6H5)2
C19H24N2O2
C21H28N4O2
C23H32N4O2
C25H36N4O2
C29H28N4O2
C22H28N4O2
48
45
52
43
39
48
227–230
235–238
212–215
218–221
182–185
188–191
2g
N
2h
2i
C21H26N4O2
C21H26N4O3
45
40
193–196
223–226
N
N
O
2j
C21H27N5O2
C22H29N5O2
43
46
205–208
117–120
N
NH
2k
N
NCH3
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The compounds were evaluated for their antimicrobial properties in compa-
rison the control antibacterial agent amoxicillin and antifungal agent nystatin.
The results of antibacterial screening, Table II, revealed that all the tested
compounds showed moderate to good bacterial inhibition. Compounds 2c and 2k
displayed excellent activity against the microbial strains. Compounds 2d, 2h, 2i
TABLE II. Antimicrobial screening results (MIC / µg mL-1) of the tested compounds
Gram-positive bacteria
B. subtilis S. aureus
Gram-negative bacteria
Fungal strain
C. albicans A. nigar
Compound
P. aeruginosa
12.5
3.12
1.56
6.25
12.5
12.5
25
E. coli
6.25
6.25
3.12
25
6.25
12.5
12.5
6.25
12.5
12.5
1.56
0.15
–
2a
2b
2c
2d
2e
2f
2g
2h
25
12.5
12.5
1.56
12.5
>100
6.25
25
25
25
12.5
>100
3.12
12.5
12.5
>100
6.25
25
6.25
0.78
3.12
25
12.5
12.5
6.25
6.25
6.25
3.12
0.15
–
1.56
12.5
3.12
6.25
12.5
12.5
12.5
12.5
12.5
–
25
12.5
12.5
6.25
1.56
0.25
–
2i
2j
2k
6.25
12.5
6.25
0.15
–
3.12
6.25
25
Amoxicillin
Nystatin
–
0.25
0.78
and 2j showed moderate antibacterial activity. Of all the synthesized derivatives,
compound 2a was found to be the least active compound against most of bacte-
rial strains. Concerning the antifungal activity of the tested compounds, only two
fungal strains were selected, C. albicans and A. niger. The data of the antifungal
screening, Table II, revealed that all the tested compounds showed moderate to
good fungal inhibition as compared to standard drug nystatin. Among the deriva-
tives, compound 2c exhibited the highest antifungal activity against both fungal
strains, while compounds 2e, 2g and 2j showed moderate antifungal activity. Of
all the synthesized derivatives, compound 2b was found to be the least active
compound against both fungal strains.
In addition, all the tested compounds demonstrated remarkable cytotoxicity
against A549 lung cancer cell line, Table III. In particular, compounds 2c and 2k
displayed significant inhibitory activity superior to that of the reference com-
pound gemcitabine.
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ANTIMICROBIAL ACTIVITY OF ISONIAZID DERIVATIVES
595
TABLE III. The cytotoxicity data against the A549 lung cancer cell line of the synthesized
compounds
a
Cell death at various doses (in µg/mL), %
IC50
IC50
mM
Compound
µg mL-1
1
2
5
10
25
2a
2b
2c
2d
2e
2f
2g
2h
2i
3.13
4.19
10.54
9.12
5.83
4.15
4.85
9.15
8.87
8.22
9.53
6.53
17.55
18.13
30.73
23.26
19.63
18.25
18.33
21.35
20.17
19.77
25.23
15.18
30.85
31.18
41.18
36.55
32.15
31.52
31.87
34.16
32.55
32.12
39.19
25.93
47.62
48
60.81
61.28
77.29
71.39
65.64
62.81
64.35
70.19
69.39
66.29
74.11
71.18
8.55
8.12
2.84
4.18
6.58
7.73
7.15
5.18
5.92
6.29
3.36
6.19
0.030
0.023
0.007
0.010
0.015
0.016
0.018
0.014
0.015
0.016
0.008
0.023
73.48
69.84
60.45
51.13
55.18
66.65
63.72
61.15
71.19
54.58
2j
2k
Gemcitabine
a
The half maximal (50%) inhibitory concentration (IC) of a substance
CONCLUSIONS
In conclusion, the present paper describes the preparation and biological eva-
luation of a series of novel isoniazid derivatives. The synthesized compounds
1
13
were characterized by suitable analytical techniques, i.e., IR, H-NMR, C-NMR
and elemental analysis and the data obtained was in full agreement of the pro-
posed structures. Among the synthesized derivatives, compound 2c and 2k, having
a diethylamino and methylpiperazine moieties, were the most active compounds
with significant biological activity. Based on preliminary antimicrobial and cyto-
toxicity results, it is supposed that both these compounds display antimicrobial
and cytotoxicity activities through a non-specific mechanism of action or that they
exert antimicrobial action due to their cytotoxicity activity. Taken together, the
compounds reported in this paper could serve as potential leads for future studies
and that further investigations are warranted to determine the mechanism of ac-
tion of these molecules.
SUPPLEMENTARY MATERIAL
Аnalytical and spectral data of synthesized compounds are available electronically from
http://www.shd.org.rs/JSCS/, or from the corresponding author on request.
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И З В О Д
СИНТЕЗА И ИСПИТИВАЊЕ АНТИМИКРОБНЕ АКТИВНОСТИ НЕКИХ НОВИХ
ДЕРИВАТА 2-ПРОПОКСИБЕНЗИЛИДЕН-ИЗОНИКОТИНОХИДРАЗИДА
MANAV MALHOTRA1, MANU ARORA2, ABDUL SAMAD3, KAPENDRA SAHU4,
PRIYANKA PHOGAT5 и AAKASH DEEP6
1Department of Pharmaceutical Chemistry, Meerut Institute of Engineering and Technology, Bypass Road-
Baghpat Crossing, Meerut-250005, Uttar Pradesh, India, 2Institute of Pharmacy and Emerging Sciences, Baddi
University, Baddi-173205, India, 3Department of Pharmaceutical Chemistry, College of Pharmacy in Al-Kharj,
King Saud University, Riyadh, Saudi Arabia, 4Department of Pharmaceutical Sciences, Rajiv Gandhi Technical
University, Bhopal-462033, India, 5Department of Pharmaceutical Sciences, Hindu College of Pharmacy, Sone-
pat-131001 и 6Department of Pharmaceutical Sciences, Maharshi Dayanand University, Rohtak-124001, India
Синтетисана је серија нових Манихових база, деривата изонијазида. Прво је реакцијом
2-пропоксибензалдехида са изонијазидом добијен одговарајући хидразон (2а). Производ 2а
је у Маниховој реакцији аминометиловања формалдехидом и секундарним аминима дао про-
изводе (2b–k). Инхибиторна in vitro активност добијених једињења испитана је према панелу
микроорганизама и А549 ћелијској линији аденокарцинома плућа. Деривати 2c и 2k имају
умерену активност према микроорганизмима, и показују значајну цитотоксичност која за-
виси од примењене концентрације једињења. IC50 вредности налазе се у опсегу 2,84–8,55
µg/mL и 0,007–0,030 mM. Структуре синтетисаних једињења одређене су на основу резул-
1
тата елементалне анализе и спектралних података (IC, H-NMR и 13C-NMR). Добијени ре-
зултати показују на значај развоја Манихових база, које могу бити активне према резистент-
ним сојевима микроорганизама, и могу бити развијани као успешни модели за развој анти-
туморских једињења.
(Примљено 10. марта, ревидирано 18. јуна 2011)
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