• Title/Summary/Keyword: organoselenium

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New Organoselenium Compounds; Synthesis of Potential Anticancer Alkylselenoallylthiopyridazine Derivatives (새로운 유기셀레늄 화합물: 잠재적 항암효과가 있는 알킬셀레노알릴티오피리다진 유도체의 합성)

  • Lee, Sun-Hee;Park, Myung-Sook
    • YAKHAK HOEJI
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    • v.55 no.1
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    • pp.32-38
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    • 2011
  • A series of new alkylselenoallylthiopyridazine 12~18 was synthesized as expected to retain anticancer activity. Synthetic route for the final compounds 12~18 was proceeded with diselenylation, hydrolysis/alkylation and allylthiolation from 3,6-dichloropyridazine 1. Dichloropyridazinyl diselenide 2 was prepared from the diselenide anion using synthetic route of Bhasin. Diselenide 2 can be reduced to 3-chloropyridazinyl selenolate anion using hydrazine hydrate at rt in the presence of NaOH in THF. The anion thus formed reacts readily with alkyl halide to give the 3-alkylseleno-6-chloropyridazine 3~11. 3-Alkylseleno-6-allylthiopyridazines 12~18 were prepared from 3~11 with allylmercaptan and sodium methoxide.

Synthesis of New Diselenide Compounds as Anti-Inflammatory Agents

  • Shen, Liulan;Shin, Kyung-Min;Lee, Kyung-Tae;Jeong, Jin-Hyun
    • Archives of Pharmacal Research
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    • v.27 no.8
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    • pp.816-819
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    • 2004
  • Many diselenide compounds are used as antioxidants, enzyme inhibitors and cytokine induc-ers. Three new diselenide compounds, bis-(2-hydroxyphenyl) diselenide, bis-(3-hydroxyphe-nyl) diselenide and bis-(4-hydroxyphenyl) diselenide were designed and synthesized as anti-inflammatory agent. All of them were found to have strong in vitro activity in anti-inflammatory assays.

Inhibition of Carcinogen-Activating Cytochrome P450 Enzymes by Xenobiotic Chemicals in Relation to Antimutagenicity and Anticarcinogenicity

  • Shimada, Tsutomu
    • Toxicological Research
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    • v.33 no.2
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    • pp.79-96
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    • 2017
  • A variety of xenobiotic chemicals, such as polycyclic aromatic hydrocarbons (PAHs), aryl- and heterocyclic amines and tobacco related nitrosamines, are ubiquitous environmental carcinogens and are required to be activated to chemically reactive metabolites by xenobiotic-metabolizing enzymes, including cytochrome P450 (P450 or CYP), in order to initiate cell transformation. Of various human P450 enzymes determined to date, CYP1A1, 1A2, 1B1, 2A13, 2A6, 2E1, and 3A4 are reported to play critical roles in the bioactivation of these carcinogenic chemicals. In vivo studies have shown that disruption of Cyp1b1 and Cyp2a5 genes in mice resulted in suppression of tumor formation caused by 7,12-dimethylbenz[a]anthracene and 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone, respectively. In addition, specific inhibitors for CYP1 and 2A enzymes are able to suppress tumor formation caused by several carcinogens in experimental animals in vivo, when these inhibitors are applied before or just after the administration of carcinogens. In this review, we describe recent progress, including our own studies done during past decade, on the nature of inhibitors of human CYP1 and CYP2A enzymes that have been shown to activate carcinogenic PAHs and tobacco-related nitrosamines, respectively, in humans. The inhibitors considered here include a variety of carcinogenic and/or non-carcinogenic PAHs and acethylenic PAHs, many flavonoid derivatives, derivatives of naphthalene, phenanthrene, biphenyl, and pyrene and chemopreventive organoselenium compounds, such as benzyl selenocyanate and benzyl selenocyanate; o-XSC, 1,2-, 1,3-, and 1,4-phenylenebis(methylene)selenocyanate.