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Synthesis and antimicrobial screening of some new pyrimido[1,2-a]benzimidazole derivatives

Shah N. M., Joshi H. S.

International Letters of Chemistry, Physics and Astronomy

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2014

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Vol. 6

56--60

EN

Some new pyrimido[1,2-a]benzimidazole derivatives were synthesized by reacting 2-amino benzimidazole and chalcones in n-butanol at reflux temperature. In our present study we have used various heterocyclic chalcones derived from furfural and substituted acetophenones. All synthesized compounds were characterized by IR, 1H NMR and Mass spectroscopy. All synthesized compounds were screened for their antimicrobial activity against gram positive and gram negative bacteria which showed moderate to good activity.

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Synthesis of New 2-Aminobenzimidazole Derivatives. Part 4. Reactions of 2-Arylideneaminobenzimidazole with Selected -Ketoesters

Nawrocka W. P., Kowalska M. W., Sztuba B., Dryś A., Wietrzyk J., Filip B.

Polish Journal of Chemistry

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2007

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Vol. 81, nr 10

1753-1753

EN

Schiff bases 2–6 obtained from 2-aminobenzimidazole 1 with p-(N,N-diethylamino)-, p-chloro-, p-bromo-, 2,4-dimethoxy-, and 3,4-dimethoxybenzaldehyde were subjected to the reaction with 1,3-ketoester: methyl-, ethyl-, benzyl-, and t-butylacetoacetate to form derivatives of pyrimido[1,2-a]benzimidazole 7–23. 1H NMR spectra recorded for the compounds 20–23 in DMSO solution indicate the presence of two conformational forms. Compounds 2, 7–23 were examined for their antiproliferative activity in vitro against the cells of human lung cancer cell lines A549.

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Synthesis and Antiproliferative Activity in vitro of New 2-Aminobenzimidazole Derivatives. Part 3 [1]. Reactions of 2-Arylideneaminobenzimidazole with Selected 1,3-Diketones

Nawrocka W., Sztuba B., Dryś A., Wietrzyk J., Kosendiak J., Opolski A.

Polish Journal of Chemistry

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2006

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Vol. 80, nr 2

279-287

EN

A series of pyrimido[1,2-a]benzimidazole derivatives has been synthesized in the reactions of 2-aminobenzimidazole Schiff bases 1-6 with selected _-diketones; acetylacetone 7-12 or benzoylacetone 13-18. The structures 4, 7-18 were confirmed by the results of elemental analysis and their IR, 1H NMR and MS spectra. Compounds 4, 7-18 were examined for their antiproliferative activityin vitro against 3 cancer cell lines: P338 (mice leukemia), A549 (non-small cell lung carcinoma), SW707 (rectal adenocarcinoma), using SRB (sulphorhodamine B) or MTT (3-(4,5-dimethylthiazol- 2-yl)-2,5-diphenyl tetrazolium bromide) technique. The Schiff base 4 and tricyclic derivatives 9, 14, 16 exhibited the highest cytotoxic activity in vitro.

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Synthesis and Antiproliferative Activity in vitro of New 2-Aminobenzimidazole Derivatives. Part 2 [1]

Nawrocka W., Sztuba B., Liszkiewicz H., Kowalska M., Wietrzyk J., Nevozhai D., Opolski A.

Polish Journal of Chemistry

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2005

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Vol. 79 / nr 4

709-716

EN

A series of 2-methylpyrimido[1,2-a]benzimidazole derivatives has been synthesized in the reactions of 2-aminobenzimidazole (1) with selected halogeno _-diketones: 1,1,1- trifluoro- 2, 1-chloro-1,1-difluoro- 3, 3-chloro-2,4-pentadione- 4 and with 4-fluorobenzoylacetone 5. 2-Aminobenzimidazole (1) in the reactions with _-chloro- and _- bromocinnamaldehyde gave Schiff bases 10 and 11 which have been subjected to reduction using NaBH4 and 3-benzylideno-1,2-dihydro- (12) and 3-benzylideno-1,2,9,10- tetrahydroimidazo[1,2-a]benzimidazole (13) were obtained. The structures 2-13 were identified by the results of elemental analysis and their IR, 1H NMR and MS spectra. Compounds 2-13 were examined for their antiproliferative activity in vitro against the cells of 3 human cancer cell lines, using SRB (sulphorhodamine B) or MTT (3-(4,5- dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) technique. Four out of all tested compounds revealed cytotoxic activity in vitro.