++2 heterocycles+2 heteroatom+tetrahedron+j.het.che

[organic]

Здравствуйте! помогите со статьями:

1. Transformations of N-Heteroarylformamidines. A Novel Synthesis of Imidazo[2,1-b]thiazole and Imidazo[2,1-b][1,3,4]thiadiazole Derivatives
Simona Fajgelj, Branko Stanovnik, and Miha Tisler
Heterocycles
Vol 24, Issue 2, 1986, pp.379-386,

DOI:

http://dx.doi.org/10.3987/R-1986-02-0379

2.Synthesis and Antimicrobial Evaluation of Novel Pyrazolo[1,5-a]pyrimidine, Pyrimido[1,2-a]benzimidazole, Triazolo[4,3-a]pyrimidine and Pyrido[1,2-a]benzimidazole Derivatives Incorporated Phenylsulfonyl Moiety
Mohamed R. Shaaban
Heterocycles
Vol 75, Issue 12, 2008, pp.3005-3014,

DOI:

http://dx.doi.org/10.3987/COM-08-11471

3.An aminoimidazole and its utility in heterocyclic synthesis
Elkholy, Yehya M.; Erian, Ayman W.;
Heteroatom Chemistry
Volume 14 Issue 6, 2003, Pages 503 - 508

DOI:

http://dx.doi.org/10.1002/hc.10178

4. Polyfunctional fused heterocyclic compounds via indene-1,3-diones
Hamdi M. Hassaneen, Tayseer A. Abdallah,, Hyam A. Abdelhadi, Huwaida M. E. Hassaneen,, Richard M. Pagni
Heteroatom Chemistry
Volume 14, Issue 6, Date: 2003, Pages: 491-497

DOI:

http://dx.doi.org/10.1002/hc.10166

5. Heterocyclic Synthesis via Enaminonitriles: an Efficient, One Step Synthesis of Some Novel Azolo[1,5-]Pyrimidine, Pyrimido[1,2-]-Benzimidazole, Pyrido[1,2-]Benzimidazole Pyrimidine and Pyrazole Derivatives
Eljazi I. Al-Afaleq
Synthetic Communications
Volume 30, Issue 11 June 2000 , pages 1985 - 1989

DOI:

http://dx.doi.org/10.1080/00397910008087248

6.Studies with 1-functionally substituted alkylbenzotriazoles: An efficient route for the synthesis of 1-azolylbenzotriazoles, benzotriazolylazines and benzotriazolylazoloazines
Fatima Al-Omran
Journal of Heterocyclic Chemistry
Volume 37, Issue 5, Date: September/October 2000, Pages: 1219-1223

DOI:

http://dx.doi.org/10.1002/jhet.5570370532

7. Dienophilicity of imidazole in inverse electron demand Diels–Alder reactions: cycloadditions with 1,2,4,5-tetrazines and the structure of zarzissine
Zhao-Kui Wan, Grace H. C. Woo and John K. Snyder
Tetrahedron
Volume 57, Issue 26, 25 June 2001, Pages 5497-5507

DOI:

http://dx.doi.org/10.1016/S0040-4020(01)00476-8

Заранее большое спасибо!

[vitaki]

3 и 4
Дои на статью № 3 содержит лишнюю ;

[vitaki]

6 и 7

[Dextra]

1 и 2

[Demcha]

5