Synthesis and antioxidant properties of novel quinoline-chalcogenium compounds

Article abstract of DOI:10.1016/j.tetlet.2012.10.067

Herein we describe our results on the synthesis and antioxidant properties of 4-arylchalcogenyl-7-chloroquinolines. This new class of compounds has been synthesized in high yields by the reaction of 4,7-dichloroquinoline with diaryl dichalcogenides using KOH as base, DMSO as solvent at 100 °C under air atmosphere and tolerates a range of substituents in the arylchalcogenyl moiety. The obtained compounds 3a and 3j were screened for in vitro antioxidant activity and the results demonstrated that compound 3j presented a potent antioxidant effect when compared to compound 3a.

Full text of DOI:10.1016/j.tetlet.2012.10.067

Tetrahedron Letters 54 (2013) 40–44
Contents lists available at SciVerse ScienceDirect
Tetrahedron Letters
journal homepage: www.elsevier.com/locate/tetlet
Synthesis and antioxidant properties of novel quinoline–chalcogenium
compounds
Lucielli Savegnago a, , Aline I. Vieira b, Natália Seus b, Bruna S. Goldani b, Micheli R. Castro b,
⇑
Eder João Lenardão b, Diego Alves b,
⇑
a Grupo de Pesquisa em Neurobiotecnologia - GPN, CDTec, Universidade Federal de Pelotas, UFPel, Pelotas, RS, Brazil
b Laboratório de Síntese Orgânica Limpa - LASOL - CCQFA - Universidade Federal de Pelotas – UFPel, P.O. Box 354, 96010-900 Pelotas, RS, Brazil
a r t i c l e i n f o
a b s t r a c t
Article history:
Herein we describe our results on the synthesis and antioxidant properties of 4-arylchalcogenyl-7-
chloroquinolines. This new class of compounds has been synthesized in high yields by the reaction of
4,7-dichloroquinoline with diaryl dichalcogenides using KOH as base, DMSO as solvent at 100 °C under
air atmosphere and tolerates a range of substituents in the arylchalcogenyl moiety. The obtained
compounds 3a and 3j were screened for in vitro antioxidant activity and the results demonstrated that
compound 3j presented a potent antioxidant effect when compared to compound 3a.
Ó 2012 Elsevier Ltd. All rights reserved.
Received 25 September 2012
Revised 15 October 2012
Accepted 17 October 2012
Available online 1 November 2012
Keywords:
Organochalcogen compounds
Selenium
Tellurium
Quinolines
Antioxidant
Organochalcogen compounds, especially containing selenium
and tellurium, are attractive molecules because of their applicabil-
ity in organic reactions1,2 and interesting biological activities.3,4
Applications in chemistry and biochemistry are well described in
various books and reviews.1–4 Among these organochalcogen com-
pounds, those containing nitrogen atoms are a special class of mol-
ecules and they have been employed in various organic
transformations, for instance, in asymmetric synthesis.2e–g In the
last few years, the growth of interest in organochalcogen chemistry
can be attributed to its specific properties and pharmaceutical
applications.1–4 Consequently, the search for new and efficient
methodologies for the synthesis of novel nitrogen-functionalized
organochalcogen compounds remain widely explored.
In the context of nitrogen-functionalized compounds, quino-
lines5 are an important class of heterocyclic compounds and their
structural unit widely existing in alkaloids, therapeutic agents, and
synthetic analogues with interesting biological activities.6 A range
of quinoline derivatives have been used as antiviral, anticancer,
antibacterial, antifungal, antiobesity, and anti-inflammatory
agents.7 Especially, 7-chloroquinoline derivatives are biological ac-
tive units and display a broad range of pharmacological activity,
including antimalarial and antitubercular properties.8 Because of
its importance as a substructure in a wide variety of synthetic
and natural products, considerable efforts have been directed to
the development of new structures based on 7-chloroquinoline.
In this regard, there are a large number of methodologies in the
literature for the synthesis of chalcogenium-containing quinolines,
especially selenium derivatives.9 This class of compounds has great
importance since they combine the well known applicability of the
quinoline unit6–8 with that of the selenium moieties3,4 and their
functions range from antioxidant, antifungal, and antibacterial
agents, to selective DNA binding and photocleaving agents.9a–g
However, to the best of our knowledge, the synthesis of
7-chloroquinolines having an arylchalcogen moiety at the position
4 of quinoline ring is not described. In this sense, and due to our
interest correlated to the preparation of nitrogen-functionalized
organochalcogen compounds,10 we describe herein the synthesis
of 4-arylchalcogenyl-7-chloroquinolines by the reaction of 4,7-
dichloroquinoline with diaryl dichalcogenides using KOH as base
and DMSO as solvent at 100 °C under air atmosphere (Fig. 1).
Additionally, the obtained 4-phenylselanyl-7-chloroquinoline 3a
and 4-phenyltellanyl-7-chloroquinoline 3j were screened for their
in vitro antioxidant activity.
Initially, our studies were focused on the synthesis of
7-chloro-4-(phenylselanyl)quinoline 3a, and for this proposal,
some experiments were performed. Recently, the copper-catalyzed
cross-coupling reactions of diaryl diselenides with aryl halides have
become a versatile tool for the synthesis of substituted aryl
selenides.11 For this reason, we started studying the reaction of
4,7-dichloroquinoline 1 (0.3 mmol) and diphenyl diselenide 2a
(0.15 mmol) in the presence of CuO nanoparticles (CuO NPs)
(3 mol %), using DMSO as solvent at 100 °C in the open atmosphere
(Scheme 1, condition A). Under this condition,11c the formation of
⇑
Corresponding authors. Tel./fax: +55 53 3275 7533.
E-mail address: diego.alves@ufpel.edu.br (D. Alves).
0040-4039/$ - see front matter Ó 2012 Elsevier Ltd. All rights reserved.
http://dx.doi.org/10.1016/j.tetlet.2012.10.067

L. Savegnago et al. / Tetrahedron Letters 54 (2013) 40–44
41
or only a trace of product 3a (Table 1, entries 4–8). Among the
tested bases, the best result was obtained using KOH (0.3 mmol)
which gave the product 3a in good yield (Table 1, entry 1). Check-
ing the Table 1, it is possible to verify that the reaction afforded the
selenium–quinoline 3a in high yield exclusively using DMSO as
solvent. Using other solvents, such as, toluene, EtOH, glycerol,
and DMF the formation of product 3a was not detected (Table 1,
entries 10–13). A great decrease in the yield of product 3a was ob-
served when the reaction was performed using 0.15 mmol of KOH
(Table 1, entry 15). Finally, aiming to improve the yield of product
3a, we used an excess of diphenyl diselenide 2a (0.3 mmol) in the
reaction, but no enhancement in the product yield was observed
(Table 1; entry 16 vs 1). Analysis of the results showed in Table 1
indicated that the best reaction conditions12 were the use of 4,7-
YAr
N
ArY YAr
2
Cl
N
Antioxidant
activity
KOH, DMSO
in vitro
Cl
100 oC, 24 h, air
Cl
3
1
Y = Se, Te
Figure 1. Synthesis of 4-arylchalcogenyl-7-chloroquinolines.
Cl
Se
N
reaction
conditions
Se Se
+
Cl
N
1
2a
Cl
(0.3 mmol)
(0.15 mmol)
3a
dichloroquinoline
1 (0.3 mmol) and diphenyl diselenide 2a
CuONPs (3 mol%), DMSO, 24 h at 100 oC, air (no product)
(0.15 mmol), in the presence of KOH (0.3 mmol) using DMSO as
solvent at 100 °C under air atmosphere for 24 h.
Condition A:
Condition B:
CuONPs (3 mol%), KOH (0.3 mmol), DMSO, 24 h at 100 oC, air (84%)
After that, the variability of our methodology reacting other dia-
ryl diselenides 2b–i with 4,7-dichloroquinoline 1 was evaluated
(Table 2). The results showed in Table 2 reveal that the reaction
worked well with a range of substituted diaryl diselenides, afford-
ing good yields of the products. The reactions are little sensitive to
the electronic effect of the aromatic ring in diaryl diselenide.
According to the results, diaryl diselenides containing electron-
donating groups (OMe, Me) gave lower yields than the diaryl disel-
enides bearing electron-withdrawing groups (Cl, F, CF3) (Table 2,
entries 1–7). We observed that steric effects had no influence on
the product formation and the reaction using dimesityl diselenide
gave the desired product 3h in 78% yield (Table 2; entry 8). When
the reaction was performed with bis(2-thienyl) diselenide 2i, the
respective selenium–quinoline 3i was obtained in 84% yield (Table
2; entry 9). In addition, under the optimized reaction conditions,
the possibility of performing the reaction with diphenyl ditelluride
was also investigated. Thus, 4,7-dichloroquinoline 1 was efficiently
reacted with diphenyl ditelluride 2j, affording the respective 7-
chloro-4-(phenyltellanyl)quinoline 3j in excellent yield (Table 2,
entry 10).
After these studies, we turned our attention to the antioxidant
activity of compounds 3a and 3j. An antioxidant agent is defined
as a molecule that protects a biological target against oxidative
damage and it is this damage that causes many diseases. As a re-
sult, many diseases have been treated with antioxidants to prevent
oxidative damage.13 Synthetic radicals such as 2,2-azinobis-3-
ethyl-benzothiazoline-6-sulfonic acid (ABTS) is often used to eval-
uate the ability of antioxidants to scavenge free radicals, which are
known to be a major factor in the biological damage caused by oxi-
dative stress.14
Scheme 1. Optimization of reaction conditions.
7-chloro-4-(phenylselanyl)quinoline 3a was not observed and the
starting materials were recovered. This reaction was also per-
formed with the addition of KOH (0.3 mmol) as base and gratify-
ingly, the desired product 3a was obtained in 84% after 24 h
(Scheme 1, condition B).
To our delight, when we performed this reaction in the absence
of copper catalyst, the desired product 3a was obtained in similar
yield after 24 h (Table 1, entry 1). This result was also observed in
the reaction under nitrogen atmosphere (Table 1, entry 2). When
the reaction of quinoline 1 and diselenide 2a was performed using
only DMSO as solvent and KOH as base at room temperature, only
traces of product 3a were detected (Table 1; entry 3). We observed
that the nature of the base was critical for the success of the reac-
tion. As shown in Table 1, reactions employing different bases,
such as NaOH, Na2CO3, Cs2CO3, K3PO4, and Et3N, gave a moderate
Table 1
Optimization of reaction conditions in the synthesis of 7-chloro-4-(phenylselanyl)
quinoline 3aa
Cl
base
solvent
temperature
24 h, air
Se
N
+
Se Se
Cl
N
2a
Cl
1
3a
Entry
Solvent
Base
Temperature (°C)
Isolated yield 3a (%)
As shown in Table 3, compound 3j in a concentration equal to or
superior than 1 lM exhibited the antioxidant activity in the ABTS
1
DMSO
DMSO
DMSO
DMSO
DMSO
DMSO
DMSO
DMSO
DMSO
toluene
EtOH
KOH
KOH
KOH
NaOH
Na2CO3
Cs2CO3
K3PO4
Et3N
—
KOH
KOH
KOH
KOH
KOH
KOH
100
100
rt
89
89
traces
58
2b
3
radical scavenging assay, whereas compound 3a did not show
the antioxidant effect in this test (data not shown). A potent radical
scavenging antioxidant often acts as a potent reductant. The ferric
ion reducing antioxidant power (FRAP) method is based on a redox
reaction.15 Thus the reducing capacity of a compound may serve as
a significant indicator of its potential antioxidant activity (Table 4).
In this assay, compound 3a had an antioxidant potential at the
starting concentration of 50 lM (Table 4), while 3j did not show
significant results in all concentrations tested.
As shown in Tables 3 and 4, compounds 3j and 3a were effective
on linoleic acid peroxidation inhibition induced with Fe–Ascorbic
acid, at a concentration equal or superior than 0.1 and 50 lM,
respectively. In this assay, organotellurium compound 3j was most
effective than organoselenium compound 3a, since in minor con-
centrations it presented antioxidant effect.
To determine the antioxidant effect of 3a and 3j, the sodium
nitroprussate (SNP) assay was used as a classical inductor of lipid
4
5
6
7
8
9
10
11
12
13
15c
16d
100
100
100
100
100
100
100
reflux
100
100
100
100
traces
traces
traces
n.d.
n.d.
n.d.
n.d.
n.d.
n.d.
39
Glycerol
DMF
DMSO
DMSO
91
a
Reactions are performed with 4,7-dichloroquinoline 1 (0.3 mmol), diphenyl
diselenide 2a (0.15 mmol), base (0.3 mmol), and at 100 °C under air atmosphere for
24 h.
b
Reaction under nitrogen atmosphere.
Reactions are performed with 0.15 mmol of KOH.
Reactions are performed using 0.3 mmol of diphenyl diselenide 2a.
c
d

42
L. Savegnago et al. / Tetrahedron Letters 54 (2013) 40–44
Table 2
Variability in the synthesis of 4-arylchalcogenyl-7-chloroquinolinesa
R
Cl
KOH
DMSO
Se
N
+
Se Se
100 oC, 24 h, air
R
R
Cl
N
2
Cl
1
3
Entry
Product (Yield)
Entry
Productb (Yield)
F
Se
Se
1
6
Cl
N
Cl
Cl
N
3a (89%)
3f (89%)
Se
Se
CF3
2
3
7
8
Cl
Cl
N
N
3b (81%)
3g (87%)
Se
Se
N
Cl
Cl
N
3c (79%)
3h (78%)
O
S
Se
Se
4
5
9
N
Cl
N
3i (84%)
3d (78%)
Cl
Te
Se
10
Cl
N
Cl
N
3j (90%)
3e (88%)
a
Reactions are performed with 4,7-dichloroquinoline 1 (0.3 mmol), diaryl dichalcogenide 2a–j (0.15 mmol), and KOH (0.3 mmol) in
DMSO (1 mL) at 100 °C under air atmosphere for 24 h.
b
Yields are given for isolated products.
Table 3
Antioxidant activity of compound 3j on ABTS, linoleic acid oxidation, and TBARS assays
(l
M)
% Oxidation linoleic acid
% Scavenging ABTS
TBARS (% oxidation)
Cortex
Hippocampus
Cerebellum
0.1
1
5
10
53.65 12.16⁄⁄⁄
52.33 7.89⁄⁄⁄
40.75 6.89⁄⁄⁄
38.98 4.95⁄⁄⁄
61.02
1.72 0.18
7.74 0.18⁄⁄
27.50 4.72⁄⁄
86.45 1.2⁄⁄
86.45
65.98 10.91⁄⁄⁄
16.08 2.69⁄⁄⁄
14.23 5.1⁄⁄⁄
14.80 1.23⁄⁄⁄
85.2
85.70 2.95
41.05 14.36⁄⁄⁄
11.85 1.38⁄⁄⁄
9.65 1.95⁄⁄⁄
90.35
81.55 6.02
39.95 16.73⁄⁄⁄
18.55 2.17⁄⁄⁄
13.73 2.51⁄⁄⁄
86.27
Imax (%)
Each value is expressed as mean standard error of the mean (S.E.M) (n = 4). (⁄) Denote p <0.05; (⁄⁄) p <0.01; (⁄⁄⁄) p <0.001 as compared to the respective control sample (one
way ANOVA/Newman-Keuls). Imax: maximal inhibition (%). TBARS results are compared to the induced (SNP-100% of oxidation).
peroxidation.16 The brain is susceptible to oxidative impairment,
due to a high content of polyunsaturated fatty acids, abundance
of redox-active transition metals. Moreover, some authors have
shown that the cortex and the hippocampus are more susceptible
to oxidative damage as compared to the cerebellum and thus have
an increased risk of neurodegenerative disease.17 Thus, based on
the considerations above, we evaluated the effect of compounds
3a and 3j in the lipid peroxidation induced by SNP by the method
of TBARS (substance reactive acid thiobarbituric-TBARS) in the cor-
tex, the cerebellum and the hippocampus of mice (Table 3 and 5).

L. Savegnago et al. / Tetrahedron Letters 54 (2013) 40–44
43
Table 4
Antioxidant activity of compound 3a on FRAP and linoleic acid oxidation assays
(l
M)
% Oxidation linoleic acid
(lM)
FRAP (abs)
50
100
500
1000
Imax (%)
77.71 1.48⁄⁄⁄
50.38 4.97⁄⁄⁄
38.39 3.48⁄⁄⁄
32.48 4.37⁄⁄⁄
67.52
10
50
75
100
0.089 0.009⁄
0.167 0.027⁄⁄
0.239 0.029
0.305 0.027⁄⁄
Each value is expressed as mean S.E.M (n = 4). (⁄) Denote p <0.05; (⁄⁄) p <0.01; (⁄⁄⁄) p <0.001 as compared to the respective control
sample (one way ANOVA/Newman-Keuls). Imax: maximal inhibition (%). Abs = absorbance.
Table 5
Antioxidant activity of compound 3a on TBARs induced by SNP in mice
TBARS (% oxidation)
Cortex
(l
M)
Hippocampus
(lM)
(l
M)
Cerebellum
50
75
100
—
Imax (%)
34.97 19.16⁄⁄
31.99 15.12
27.79 13.07⁄⁄
—
5
10
50
100
Imax (%)
74.27 1.57⁄⁄
68.15 3.69⁄⁄⁄
17.56 3.00⁄⁄⁄
17.76 5.75⁄⁄⁄
82.44
10
25
50
100
Imax (%)
40.32 6.9⁄⁄⁄
29.48 9.49⁄⁄⁄
17.67 1.46⁄⁄⁄
26.30 12.75⁄⁄⁄
82.33
72.21
Each value is expressed as mean S.E.M (n = 4). (⁄) Denote p <0.05; (⁄⁄) p <0.01; (⁄⁄⁄) p <0.001 as compared to the induced (SNP-100% of oxidation) (one way ANOVA/Newman-
Keuls). Imax: maximal inhibition (%).
T. Organoselenium Chemistry: Synthesis and Reactions; Wiley-VCH:; Wiley-VCH:
Weinheim, 2011; (e) Menezes, P. H.; Zeni, G. Vinyl Selenides Patai’s. In
Chemistry of Functional Groups; John Wiley & Sons, 2011; (f) Petragnani, N.;
As shown in Table 5, compound 3a was effective in inhibiting
the lipid peroxidation induced by SNP in the cortex, the cerebellum
and the hippocampus of mice at a concentration equal to or higher
than 5, 10, or 50 M, respectively. The compound 3j showed a sig-
nificant inhibition of lipid peroxidation in the concentration equal
or higher than 0.1 M in the hippocampus, whereas in the cortex
and the cerebellum starting from a concentration of 1 M (Table
Stefani, H. A. Tellurium in Organic Synthesis, 2nd ed.; Academic Press: London,
2007.
l
2. For Reviews see: (a) Perin, G.; Lenardão, E. J.; Jacob, R. G.; Panatieri, R. B. Chem.
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l
l
3). In fact, organotellurium compounds can protect against the
pro-oxidant effects of peroxynitrite.16
Some studies have described that the toxicity of organosele-
nium and organotellurium compounds could be associated with
the d-aminolevulinate dehydratase (d-ALA-D) inhibition. d-ALA-D
is a sulfhydryl containing enzyme which can be inhibited at differ-
ent pro oxidant situations and this enzyme can be used as a marker
of toxicity .18–20 Thus, based on considerations above, we investi-
gated whether compounds 3a and 3j can inhibit the d-ALA activity.
Our results showed that d-ALA-D activity was not modified under
the tested concentrations for organic compounds 3a and 3j.
In summary, we have demonstrated the efficient synthesis and
antioxidant activity of a range of novel 4-arylchalcogenyl-7-
chloroquinolines. This new class of compounds was synthesized
in high yields by the reaction of 4,7-dichloroquinoline with diaryl
dichalcogenides under simple reaction conditions and tolerates a
range of substituents in the arylchalcogenyl moiety. The obtained
results revealed that compounds 3a and 3j have antioxidant
activity in vitro and the data demonstrated that 3j exhibited a
potent antioxidant effect when compared to 3a. This protocol is
an efficient method to produce new selenium–nitrogen com-
pounds with antioxidant activity.
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Acknowledgments
We are grateful to CAPES, CNPq, FINEP, and FAPERGS (PRONEX
10/0027-4 and PRONEM 11/2024-9) for the financial support. L.S.,
E.J.L., and D.A. are recipients of CNPq fellowship.
References and notes
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8. For examples of biological active 7-chloroquinolines see: (a) Macedo, B.;
Kaschula, C. H.; Hunter, R.; Chaves, J. A. P.; van der Merwe, J. D.; Silva, J. L.; Egan,
T. J.; Cordeiro, Y. Eur. J. Med. Chem. 2010, 45, 5468; (b) Candéa, A. L. P.; Ferreira,

44
L. Savegnago et al. / Tetrahedron Letters 54 (2013) 40–44
M. L.; Pais, K. C.; Cardoso, L. N. F.; Kaiser, C. R.; Henriques, M. G. M.; Lourenço,
12. General procedure for the synthesis of 7-chloro-4-(arylselanyl)quinolines 3a–k: To
a round-bottomed flask containing the appropriated diaryl dichalcogenide
(0.15 mmol) and 4,7-dichloroquinoline (0.3 mmol), were added DMSO (1.0 mL)
and KOH (0.3 mmol). The reaction mixture was allowed to stir at 100 °C for
24 h. After this time, the solution was cooled to room temperature, diluted
with ethyl acetate (15 mL), and washed with water (3 Â 15 mL). The organic
phase was separated, dried over MgSO4, and concentrated under vacuum. The
obtained products were purified by flash chromatography on silica gel using a
mixture of ethyl acetate/hexane (20:80) as the eluent. Selected spectral and
analytical data for: 7-chloro-4-(phenylselanyl)quinoline (3a): Yield: 0.085 g
(89%); pale yellow solid; mp 81–83 °C. 1H NMR (CDCl3, 400 MHz) d = 8.50 (d,
J = 4.7 Hz, 1H), 8.06 (d, J = 2.0 Hz, 1H), 7.96 (d, J = 8.9 Hz, 1H), 7.63–7.61 (m,
2H), 7.49–7.37 (m, 4H), 6.97 (d, J = 4.7 Hz, 1H). 13C NMR (CDCl3, 100 MHz)
d = 150.38, 148.10, 145.86, 136.14, 135.56, 130.00, 129.36, 128.82, 127.50,
126.60, 126.23, 126.04, 121.93. MS (relative intensity) m/z: 321 (44), 320 (21),
319 (100), 317 (50), 284 (34), 282 (20), 241 (30), 239 (94), 204 (96), 162 (22),
142 (21), 135 (45), 127 (42), 99 (71), 77 (45), 75 (19), 51 (38). 7-Chloro-4-
(phenyltellanyl)quinoline (3j): Yield: 0.099 g (90%); pale yellow solid; mp 80–
82 °C. 1H NMR (CDCl3, 400 MHz) d = 8.43 (d, J = 4.4 Hz, 1H), 8.05 (s, 1H), 7.85 (d,
J = 7.6 Hz, 2H), 7.74 (d, J = 8.8 Hz, 1H), 7.50–7.43 (m, 2H), 7.35–7.31 (m, 3H).
13C NMR (CDCl3, 100 MHz) d = 150.27, 147.88, 140.50, 135.60, 132.94, 130.36,
130.19, 129.43, 129.39, 129.06, 128.66, 127.78, 111.81. MS (relative intensity)
m/z: 371 (12), 369 (45), 367 (39), 365 (22), 241 (32), 239 (100), 204 (95), 162
(27), 135 (29), 127 (29), 99 (47), 77 (59), 51 (28).
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