TY  - JOUR
AU  - Džambaski, Zdravko
AU  - Marković, Rade
AU  - Kleinpeter, Erich
AU  - Baranac-Stojanović, Marija
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1344
AB  - A series of 5-unsubstituted and 5-substituted 2-alkylidene-4-oxothiazolidine-S-oxides were synthesized by the sulfur-oxidation with m-CPBA. The stereochemistry of 5-substituted sulfoxides was determined by means of NMR spectroscopy and DFT theoretical calculations. It was found that the thermodynamically less stable anti-isomer was initially formed in the course of the oxidation, but it underwent epimerization to the mixture enriched in the more stable syn-isomer, during the work-up process. The higher stability of syn-isomers is ascribed to the stronger hyperconjugative sigma(C-H)->sigma*(S-O) interaction versus the weaker sigma(C-C)->sigma*(S-O) delocalization in their anti-counterparts and to the existence of intramolecular 1,5-CH center dot center dot center dot C hydrogen bonds.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Tetrahedron
T1  - 2-Alkylidene-4-oxothiazolidine S-oxides: synthesis and stereochemistry
VL  - 69
IS  - 31
SP  - 6436
EP  - 6447
DO  - 10.1016/j.tet.2013.05.087
ER  - 

@article{
author = "Džambaski, Zdravko and Marković, Rade and Kleinpeter, Erich and Baranac-Stojanović, Marija",
year = "2013",
abstract = "A series of 5-unsubstituted and 5-substituted 2-alkylidene-4-oxothiazolidine-S-oxides were synthesized by the sulfur-oxidation with m-CPBA. The stereochemistry of 5-substituted sulfoxides was determined by means of NMR spectroscopy and DFT theoretical calculations. It was found that the thermodynamically less stable anti-isomer was initially formed in the course of the oxidation, but it underwent epimerization to the mixture enriched in the more stable syn-isomer, during the work-up process. The higher stability of syn-isomers is ascribed to the stronger hyperconjugative sigma(C-H)->sigma*(S-O) interaction versus the weaker sigma(C-C)->sigma*(S-O) delocalization in their anti-counterparts and to the existence of intramolecular 1,5-CH center dot center dot center dot C hydrogen bonds.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Tetrahedron",
title = "2-Alkylidene-4-oxothiazolidine S-oxides: synthesis and stereochemistry",
volume = "69",
number = "31",
pages = "6436-6447",
doi = "10.1016/j.tet.2013.05.087"
}

Džambaski, Z., Marković, R., Kleinpeter, E.,& Baranac-Stojanović, M.. (2013). 2-Alkylidene-4-oxothiazolidine S-oxides: synthesis and stereochemistry. in Tetrahedron
Oxford : Pergamon-Elsevier Science Ltd., 69(31), 6436-6447.
https://doi.org/10.1016/j.tet.2013.05.087

Džambaski Z, Marković R, Kleinpeter E, Baranac-Stojanović M. 2-Alkylidene-4-oxothiazolidine S-oxides: synthesis and stereochemistry. in Tetrahedron. 2013;69(31):6436-6447.
doi:10.1016/j.tet.2013.05.087 .

Džambaski, Zdravko, Marković, Rade, Kleinpeter, Erich, Baranac-Stojanović, Marija, "2-Alkylidene-4-oxothiazolidine S-oxides: synthesis and stereochemistry" in Tetrahedron, 69, no. 31 (2013):6436-6447,
https://doi.org/10.1016/j.tet.2013.05.087 . .

TY  - JOUR
AU  - Stojanović, Milovan
AU  - Marković, Rade
AU  - Kleinpeter, Erich
AU  - Baranac-Stojanović, Marija
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1011
AB  - Syntheses of thiazolidine-fused heterocycles via exo-mode cyclizations of vinylogous N-acyliminium ions incorporating heteroatom-based nucleophiles have been examined and discussed. The formation of (5,6)-membered systems was feasible with all nucleophiles tried (O, S and N), while the closing of the five-membered ring was restricted to O- and S-nucleophiles. The closure of a four-membered ring failed. Instead, the bicyclic (5,6)-membered acetal derivative and the tricyclic system with an eight-membered central ring were obtained from the substrates containing O and S nucleophilic moieties, respectively. The reaction outcome and stereochemistry are rationalized using quantum chemical calculations at B3LYP/6-31G(d) level. The exclusive cis-stereoselectivity in the formation of (5,6)- and (5,5)-membered systems results from thermodynamic control, whereas the formation of the eight-membered ring was kinetically controlled.
PB  - Royal Soc Chemistry, Cambridge
T2  - Organic & Biomolecular Chemistry
T1  - Synthesis of thiazolidine-fused heterocycles via exo-mode cyclizations of vinylogous N-acyliminium ions
VL  - 10
IS  - 3
SP  - 575
EP  - 589
DO  - 10.1039/c1ob06451g
ER  - 

@article{
author = "Stojanović, Milovan and Marković, Rade and Kleinpeter, Erich and Baranac-Stojanović, Marija",
year = "2012",
abstract = "Syntheses of thiazolidine-fused heterocycles via exo-mode cyclizations of vinylogous N-acyliminium ions incorporating heteroatom-based nucleophiles have been examined and discussed. The formation of (5,6)-membered systems was feasible with all nucleophiles tried (O, S and N), while the closing of the five-membered ring was restricted to O- and S-nucleophiles. The closure of a four-membered ring failed. Instead, the bicyclic (5,6)-membered acetal derivative and the tricyclic system with an eight-membered central ring were obtained from the substrates containing O and S nucleophilic moieties, respectively. The reaction outcome and stereochemistry are rationalized using quantum chemical calculations at B3LYP/6-31G(d) level. The exclusive cis-stereoselectivity in the formation of (5,6)- and (5,5)-membered systems results from thermodynamic control, whereas the formation of the eight-membered ring was kinetically controlled.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "Organic & Biomolecular Chemistry",
title = "Synthesis of thiazolidine-fused heterocycles via exo-mode cyclizations of vinylogous N-acyliminium ions",
volume = "10",
number = "3",
pages = "575-589",
doi = "10.1039/c1ob06451g"
}

Stojanović, M., Marković, R., Kleinpeter, E.,& Baranac-Stojanović, M.. (2012). Synthesis of thiazolidine-fused heterocycles via exo-mode cyclizations of vinylogous N-acyliminium ions. in Organic & Biomolecular Chemistry
Royal Soc Chemistry, Cambridge., 10(3), 575-589.
https://doi.org/10.1039/c1ob06451g

Stojanović M, Marković R, Kleinpeter E, Baranac-Stojanović M. Synthesis of thiazolidine-fused heterocycles via exo-mode cyclizations of vinylogous N-acyliminium ions. in Organic & Biomolecular Chemistry. 2012;10(3):575-589.
doi:10.1039/c1ob06451g .

Stojanović, Milovan, Marković, Rade, Kleinpeter, Erich, Baranac-Stojanović, Marija, "Synthesis of thiazolidine-fused heterocycles via exo-mode cyclizations of vinylogous N-acyliminium ions" in Organic & Biomolecular Chemistry, 10, no. 3 (2012):575-589,
https://doi.org/10.1039/c1ob06451g . .

TY  - JOUR
AU  - Stojanović, Milovan
AU  - Marković, Rade
AU  - Kleinpeter, Erich
AU  - Baranac-Stojanović, Marija
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/814
AB  - endo-Mode cyclizations of vinylogous N-acyliminium ions incorporating heteroatom-based nucleophiles have been examined as a route to the synthesis of condensed thiazolidines. The scope of these reactions and stereochemical outcome are discussed and explained using quantum chemical calculations.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Tetrahedron
T1  - endo-Mode cyclizations of vinylogous N-acyliminium ions as a route to the synthesis of condensed thiazolidines
VL  - 67
IS  - 49
SP  - 9541
EP  - 9554
DO  - 10.1016/j.tet.2011.10.011
ER  - 

@article{
author = "Stojanović, Milovan and Marković, Rade and Kleinpeter, Erich and Baranac-Stojanović, Marija",
year = "2011",
abstract = "endo-Mode cyclizations of vinylogous N-acyliminium ions incorporating heteroatom-based nucleophiles have been examined as a route to the synthesis of condensed thiazolidines. The scope of these reactions and stereochemical outcome are discussed and explained using quantum chemical calculations.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Tetrahedron",
title = "endo-Mode cyclizations of vinylogous N-acyliminium ions as a route to the synthesis of condensed thiazolidines",
volume = "67",
number = "49",
pages = "9541-9554",
doi = "10.1016/j.tet.2011.10.011"
}

Stojanović, M., Marković, R., Kleinpeter, E.,& Baranac-Stojanović, M.. (2011). endo-Mode cyclizations of vinylogous N-acyliminium ions as a route to the synthesis of condensed thiazolidines. in Tetrahedron
Oxford : Pergamon-Elsevier Science Ltd., 67(49), 9541-9554.
https://doi.org/10.1016/j.tet.2011.10.011

Stojanović M, Marković R, Kleinpeter E, Baranac-Stojanović M. endo-Mode cyclizations of vinylogous N-acyliminium ions as a route to the synthesis of condensed thiazolidines. in Tetrahedron. 2011;67(49):9541-9554.
doi:10.1016/j.tet.2011.10.011 .

Stojanović, Milovan, Marković, Rade, Kleinpeter, Erich, Baranac-Stojanović, Marija, "endo-Mode cyclizations of vinylogous N-acyliminium ions as a route to the synthesis of condensed thiazolidines" in Tetrahedron, 67, no. 49 (2011):9541-9554,
https://doi.org/10.1016/j.tet.2011.10.011 . .

TY  - JOUR
AU  - Baranac-Stojanović, Marija
AU  - Klaumuenzer, Ute
AU  - Marković, Rade
AU  - Kleinpeter, Erich
PY  - 2010
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3172
AB  - Structures of a series of push-pull 2-alkylidene-4-thiazolidinones and 2-alkylidene-4,5-fused bicyclic thiazolidine derivatives were optimized at the B3LYP/6-31G(d) level of theory in the gas phase and discussed with respect to configurational and conformational stability. Employing the GIAO method, C-13 NMR chemical shifts of the C-2, C-2', C-4 and C-5 atoms were calculated at the same level of theory in the gas phase and with inclusion of solvent, and compared with experimental data. Push-pull effect of all compounds was quantified by means of the quotient pi*/pi, length of the partial double bond, C-13 NMR chemical shift difference (Delta delta(C=C)) and H-1 NMR chemical shifts of olefinic protons. The effect of bromine on donating and accepting ability of other substituents of the push-pull C=C double bond is discussed, too. (C) 2010 Elsevier Ltd. All rights reserved.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Tetrahedron
T1  - Structure, configuration, conformation and quantification of the push pull-effect of 2-alkylidene-4-thiazolidinones and 2-alkylidene-4,5-fused bicyclic thiazolidine derivatives
VL  - 66
IS  - 46
SP  - 8958
EP  - 8967
DO  - 10.1016/j.tet.2010.09.040
ER  - 

@article{
author = "Baranac-Stojanović, Marija and Klaumuenzer, Ute and Marković, Rade and Kleinpeter, Erich",
year = "2010",
abstract = "Structures of a series of push-pull 2-alkylidene-4-thiazolidinones and 2-alkylidene-4,5-fused bicyclic thiazolidine derivatives were optimized at the B3LYP/6-31G(d) level of theory in the gas phase and discussed with respect to configurational and conformational stability. Employing the GIAO method, C-13 NMR chemical shifts of the C-2, C-2', C-4 and C-5 atoms were calculated at the same level of theory in the gas phase and with inclusion of solvent, and compared with experimental data. Push-pull effect of all compounds was quantified by means of the quotient pi*/pi, length of the partial double bond, C-13 NMR chemical shift difference (Delta delta(C=C)) and H-1 NMR chemical shifts of olefinic protons. The effect of bromine on donating and accepting ability of other substituents of the push-pull C=C double bond is discussed, too. (C) 2010 Elsevier Ltd. All rights reserved.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Tetrahedron",
title = "Structure, configuration, conformation and quantification of the push pull-effect of 2-alkylidene-4-thiazolidinones and 2-alkylidene-4,5-fused bicyclic thiazolidine derivatives",
volume = "66",
number = "46",
pages = "8958-8967",
doi = "10.1016/j.tet.2010.09.040"
}

Baranac-Stojanović, M., Klaumuenzer, U., Marković, R.,& Kleinpeter, E.. (2010). Structure, configuration, conformation and quantification of the push pull-effect of 2-alkylidene-4-thiazolidinones and 2-alkylidene-4,5-fused bicyclic thiazolidine derivatives. in Tetrahedron
Oxford : Pergamon-Elsevier Science Ltd., 66(46), 8958-8967.
https://doi.org/10.1016/j.tet.2010.09.040

Baranac-Stojanović M, Klaumuenzer U, Marković R, Kleinpeter E. Structure, configuration, conformation and quantification of the push pull-effect of 2-alkylidene-4-thiazolidinones and 2-alkylidene-4,5-fused bicyclic thiazolidine derivatives. in Tetrahedron. 2010;66(46):8958-8967.
doi:10.1016/j.tet.2010.09.040 .

Baranac-Stojanović, Marija, Klaumuenzer, Ute, Marković, Rade, Kleinpeter, Erich, "Structure, configuration, conformation and quantification of the push pull-effect of 2-alkylidene-4-thiazolidinones and 2-alkylidene-4,5-fused bicyclic thiazolidine derivatives" in Tetrahedron, 66, no. 46 (2010):8958-8967,
https://doi.org/10.1016/j.tet.2010.09.040 . .