• 제목/요약/키워드: Aromatic bromination

검색결과 5건 처리시간 0.019초

A Green Protocol for the Bromination and Iodination of the Aromatic Compounds using H5IO6/NaBr and H5IO6/NaI in the Water

  • Yousefi-Seyf, Jaber;Tajeian, Kazem;Kolvari, Eskandar;Koukabi, Nadiya;Khazaei, Ardeshir;Zolfigol, Mohammad Ali
    • Bulletin of the Korean Chemical Society
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    • 제33권8호
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    • pp.2619-2622
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    • 2012
  • Bromination and iodination of the aromatic compounds have efficiently been carried out at room temperature and $70^{\circ}C$, respectively, in short reaction times using orthoperiodic acid/sodium bromide (1:2) and orthoperiodic acid/sodium iodide (1:2) in water to prepare the corresponding halo compounds with excellent yields.

Functional Analyses and Application of Microbial Lactonohydrolases

  • Shimizu, Sakayu;Honda, Kohsuke;Kataoka, Michihiko
    • Biotechnology and Bioprocess Engineering:BBE
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    • 제7권3호
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    • pp.130-137
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    • 2002
  • Microbial lactonohydrolases (intramolecular ester bond-hydrolyzing enzymes) with unique properties were found. The lactonohydrolase from Fusarium oxysporum catalyzes enantiose-lective hydrolysis of aldonate lactones and D-pantoyl lactone (D-PL). This enzyme is useful for the large-scale optical resolution of racemic PL. The Agrobacterium tumefaciens enzyme catalyzes asymmetric hydrolysis of PL, but the stereospecificity is opposite to that of the Fusarium enzyme. Dihydrocoumarin hydrolase (DHase) from Acinetobacter calcoaceticus is a bifunctional enzyme, which catalyzes not only hydrolysis of aromatic lactones but also bromination of monochlorodi-medon in the presence of H$_2$O$_2$and dihydrocoumarin. DHase also hydrolyzes several linear esters, and is useful for enantioselective hydrolysis of methyl DL-$\beta$-acetylthioisobutyrate and regioselective hydrolysis of methyl cetraxate.

새로운 2-이미노티아졸린 유도체의 합성과 항균활성 (II) (A Synthesis of New 2-Iminothiazolines and Their Antifungal Activities (II))

  • 남기달;최경자;조광연;한호규
    • Applied Biological Chemistry
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    • 제41권6호
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    • pp.471-476
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    • 1998
  • 신 농약을 개발할 목적으로 선도화합물인 티아졸린의 곁가지를 변화시킨 새로운 2-이미노티아졸린 유도체를 합성하여 항균활성을 검색하였다. 디키틴과 아닐린으로부터 제조된 아세토아세트아닐리드 유도체를 브롬화하여 상응하는 감마-브로모아세토아세트아닐리드 유도체를 얻고 이를 티오우레아 유도체와 반응시켜 2-이미노티아졸린 유도체를 합성하였다. 2-이미노티아졸린의 항균활성을 검색하고자 6 종류의 대표적인 식물 병원균에 대한 시험(in vivo)을 하였다. 2-페노치환체들은 벼도열병균에 대하여 250 ppm에서 탁월한 항균성을 나타냈다. 1차 활성시험에서 방제가 90이상으로 평가된 것만 선발하여 2차 활성시험(농도저하 시험)을 수행하였다. 2-아릴기에 전자주게보다 전자 끌게, 전자끌게 중에서도 할로겐치환체가 도입된 경우에 고 활성을 나타냈으며 불소원자가 치환된 경우에 활성이 비교적 양호하였다.

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