Synthesis of new 2-substituted 6-bromo-3-methylthiazolo[3,2-alpha]-benzimidazole derivatives and their biological activities.
Z Naturforsch C J Biosci, 2011/1-2011/2;66(1-2):7-16.
Abdel-Aziz HA[1], Hamdy NA, Gamal-Eldeen AM, Fakhr IM
Affiliations
PMID: 21476431
Impact factor: 1.885
Abstract
1-(6-Bromo-3-methyl-1,3-thiazolo[3,2-alpha]benzimidazol-2-yl)ethanone (2) was prepared by bromination at ambient temperature of 1-(3-methylthiazolo[3,2-alpha]benzimidazol-2-yl)ethanone (1). The structure of 2 was determined by single-crystal X-ray diffraction. The precursor 5 was synthesized by heating a mixture of acetyl 2 and bromine. Various 2-substituted 6-bromo-3-methylthiazolo[3,2-alpha]benzimidazoles containing 1,3-thiazole, 1,4-benzothiazine, quinoxaline or imidazo[1,2-alpha]pyridine moieties were prepared starting from bromoacetyl 5. Taken together from the biological investigations, 2, 5, and 7a were potent immunosuppressors against both macrophages and T-lymphocytes, and 7b, 11b, and 14 were potent immunostimulators towards both types of immune cells. The results also revealed that, among others, 2 and 14 were the most significant inhibitors of LPS-stimulated NO generation, and that 5, 7a, and 7b had a weak radical scavenging activity against DPPH radicals. Moreover, 2, 5, and 7a had a concomitant strong cytotoxicity against colon carcinoma, hepatocellular carcinoma, and lymphoblastic leukemia cells. Collectively, compounds 2, 5, and 7a are multipotent compounds with promising biological activities.
MeSH terms
Benzimidazoles; Cell Line, Tumor; Crystallography, X-Ray; Humans; Magnetic Resonance Spectroscopy; Structure-Activity Relationship
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