XIV
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International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
140
T1: P–7
New ester with thioxoimidazoquinazoline ring
Agnieszka Szyszkowska
1
, and Iwona Zarzyka
1
1
Department of Organic Chemistry, Rzeszow University of Technology, 35-959 Rzeszów,
Powstańców Warszawy 6, Poland, e-mail: szyszkowska.a@wp.pl
Thioxoimidazo[4,5-g]quinazoline (I) and thioxoimidazo[4,5-h]quinazoline (II) derivatives
(Fig. 1) exhibit biological activity. They have a potent and selective effect of inhibiting cyclic
guanosine 3',5'-1 monophosphate (cGMP)-specific phosphodiesterase and are useful in treating
or ameliorating cardiovascular diseases such as thrombosis, angina pectoris, hypertension, heart
failure and arteriosclerosis, asthma, sexual impotence, etc. These compounds are also used to
inhibit neoplasia, especially for the treatment of cancer and pre-cancerous lesions [1–7].
N
N
N
H
N
H
S
(I)
NH
N
H
S
N
N
(II)
Fig. 1. General formula of 2-thioxoimidazo[4,5-g]quinazoline (I) and 2-thioxoimidazo[4,5-h]quinazoline (II).
Currently,
research,
concerning
the
synthesis
of
novel
derivatives
with
thioxoimidazoquinazoline ring, is still conducted.
In present work, bisester with thioxoimidazoquinazoline ring was obtained in reaction of 1-
phenyl-2H,6H-3-thioxoimidazo[1,5-c]quinazolin-5-one (III) with ethyl bromoacetate. Reaction
scheme was performed in Figure 2. Reaction was carried out under mild conditions in the
presence of potassium carbonate as catalyst. 2,6-bis(ethoxycarbonylmethyl)-1-phenyl-3-
thioxoimidazo[1,5-c]quinazoline-5-one (IV), (Fig. 2) was isolated at high yield and
characterized by instrumental methods: elemental analysis, IR, 1H- and 13C-NMR
spectroscopies and 2D experiments correlation spectroscopy.
N
N
N
O
S
COOC
2
H
5
COOC
2
H
5
NH
N
NH
O
S
CH
2
COOC
2
H
5
Br
(IV)
(III)
2
+
- 2 HBr
Fig. 2. Scheme of 2,6-bis(ethoxycarbonylmethyl)-1-phenyl-3-thioxoimidazo[1,5-c]quinazolin-5-one synthesis.
Keywords: thioxoimidazoquinazoline ring, ester, synthesis, structure characterization
References
[1] S. W. Schneller, A. C. Ibay, E. A. Martinson, J. N. Wells, J Med Chem. 29 (1986) 972.
[2] S. W. Schneller, A. C. Ibay, W. J. Christ, R. F. Bruns, 32 (1986) 2247.
[3] C. Gennari, R. Todeschini, M. G. Beretta, G. Favini, C. Scolastico, J. Org. Chem. 51 (1986) 612.
[4] A. J. Barker, pat. EP635507 (1993).
[5] D. Machii, K. Matsuno, pat. WO95/06648 (1993).
[6] Y. Onoda, Y. Nomoto, T. Ohno, K. Yamada, M. Ichimura, pat. US6127541A (2000).
[7] R. Pamukeu, G. Piazza, pat. US2002193389 (2002).
XIV
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International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
141
T1: P–8
Spectral characterization of 2-(ethoxycarbonylmethyl)-6H-1-phenyl-3-
thioxoimidazo[1,5-c]quinazoline-5-one
Agnieszka Szyszkowska
1
, Karol Hęclik
2
, and Iwona Zarzyka
1
1 Department of Organic Chemistry, Faculty of Chemistry, Rzeszow University of Technology, 35-
959 Rzeszów, Powstańców Warszawy 6, Poland, e-mail: szyszkowska.a@wp.pl
2 Department of Biochemistry and Biotechnology, Faculty of Chemistry, Rzeszow University of
Technology, 35-959 Rzeszów, Powstańców Warszawy 6, Poland
Heterocyclic compounds containing a sulfur atom are interesting substances, since many of
them can have biologically activity [1–3]. Derivatives of imidazolines with sulfur atoms arouse
also high popularity. A number of 2-thioxoimidazolines and their derivatives exhibit significant
biological activities [4, 5], e.g. inflammatory activity [6], inhibitory activity of gentamycin
nephrotoxicity [7] and dopamine β-hydroxylase and anti-aggregating activity against collagen
[8]. Therefore, it can be supposed that thioxoimidazoquinazoline derivatives should also display
significant biological activity.
In this work, we demonstrate the equimolar reaction of 1-phenyl-2H,6H-3-thioxoimidazo [1,5-
c]quinazolin-5-one (I) with ethyl bromoacetate (II) results in 2-(ethoxycarbonylmethyl)-1-
phenyl-6H-3-thioxoimidazo[1,5-c]quinazoline-5-one (III) formation (Fig. 1).
NH
N
N
O
S
COOC
2
H
5
NH
N
NH
O
S
CH
2
COOC
2
H
5
Br
K
2
CO
3
(III)
(I)
(II)
Fig. 1. Synthesis scheme of 2-(ethoxycarbonylmethyl)-1-phenyl-6H-3-thioxoimidazo[1,5-c]quinazolin-5-one.
2-(ethoxycarbonylmethyl)-1-phenyl-6H-3-thioxoimidazo[1,5-c]quinazolin-5-one is formed as
only reaction product. The new ester has been identified by elemental analysis, the 1H- and
13C-NMR, and IR measurements.
Quantum-mechanical modelling carried out with the use of DFT method, confirmed this way
of substitution. It was calculated that 99.96 % of the monoester is formed at position No. 2. The
reason of the reaction chemoselectivity is the distribution of electron density in 1-phenyl-
2H,6H-3-thioxoimidazo[1,5-c]quinazolin-5-one molecule. I was explained in details earlier, in
[9], which refers to monohydroxyalkylated derivatives of 1-phenyl-2H,6H-imidazo[1,5-
c]quinazoline-3,5-dione.
Keywords: thioxoimidazoquinazoline ring; ester; synthesis; structure characterization; quantum-mechanical
calculation
References
[1] F. Suzuki, T. Kuroda, Y. Nakasato, H. Manabe, K. Ohmori, S. Kitamura, S. Ichikawa, T. Ohno, J. Med.
Chem. 35 (1992) 4045.
[2] R. D. Northcross, I. Paterson, Chem. Rev. 95 (1995) 2041.
[3] D. J. Faulkner, Nat. Prod. Rep. 12 (1995) 223.
[4] K. Matsuda, I. Yanagisawa, Y. Isomura, T. Mase, T. Shibanuma, Synth. Commun. 27 (1997) 3565.
[5] W. du Mont, G. Mugesh, C. Wismach, P. G. Jones, Angew. Chem., Int. Ed. 40 (2001) 2486.
[6] J. Fatimi, J. F. Lagorce, J. L. Duroux, M. L. Chabernaud, J. Buxeroud, C. Raby, Chem. Pharm. Bull. 42
(1994) 698.
[7] B. H. Ali, A. A. Bashir, M. O. Tanira, Hum. Exp. Toxicol. 14 (1995) 13.
[8] L. I. Kruse, C. Kaiser, W. E. DeWolf, J. S. Frazee, E. Garvey, E. L. Hilbert, W. A. Faulkner, K. E. Flaim, J.
L. Sawyer, B. A. Berkowitz, J. Med. Chem. 29 (1986) 2465.
[9] A. Szyszkowska, K. Hęclik, D. Trzybiński, K. Woźniak, A. Klasek, I. Zarzyka, J. Mol. Struct. 1127 (2017)
708.
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