Heteroarylmethoxyphenylalkoxyiminoalkylcarboxylic Acids as Leukotriene Biosynthesis Inhibitors
作者:Teodozyj Kolasa、David E. Gunn、Pramila Bhatia、Keith W. Woods、Todd Gane、Andrew O. Stewart、Jennifer B. Bouska、Richard R. Harris、Keren I. Hulkower、Peter E. Malo、Randy L. Bell、George W. Carter、Clint D. W. Brooks
DOI:10.1021/jm9904102
日期:2000.2.1
A novel series of heteroarylmethoxyphenylalkoxyiminoalkylcarboxylic acids was studied as leukotrienebiosynthesisinhibitors. A hypothesis of structure-activity optimization by insertion of an oxime moiety was investigated using REV-5901 as a starting point. A systematic structure-activity optimization showed that the spatial arrangement and stereochemistry of the oxime insertion unit proved to be
Symmetrical Bis(heteroarylmethoxyphenyl)alkylcarboxylic Acids as Inhibitors of Leukotriene Biosynthesis
作者:Teodozyj Kolasa、David E. Gunn、Pramila Bhatia、Anwer Basha、Richard A. Craig、Andrew O. Stewart、Jennifer B. Bouska、Richard R. Harris、Keren I. Hulkower、Peter E. Malo、Randy L. Bell、George W. Carter、Clint D. W. Brooks
DOI:10.1021/jm000180n
日期:2000.8.1
challenge in actively sensitized guinea pigs, 47.Na dosed orally blocked bronchoconstriction with an ED(50) = 0.4 mg/kg, the most potent activity we have observed for any leukotrieneinhibitor in this model. The mode of inhibitory action of 47.Na occurs at the stage of 5-lipoxygenase biosynthesis as it blocks both leukotriene pathways leading to LTB(4) and LTC(4) but not PGH(2) biosynthesis. However,
tuning the electrontransfer between radicals and enolates has been developed. This method elicits the innate reactivity of AIBN with a copper catalyst and enables a cascade reaction with cinnamic acids. Electron paramagnetic resonance studies and control experiments indicate that the redox‐active copper species not only activates the radical by coordination, but also serves as a bridge to bring the
Stereoselective intermolecular radical additions to amide-substituted alkenes
作者:Ned A. Porter、Daniel M. Scott、Ian J. Rosenstein、Bernd Giese、Andreas Veit、Heinz Georg Zeitz
DOI:10.1021/ja00005a051
日期:1991.2
substrate examined was the diamide of fumaric acid, 2. Hexyl, cyclohexyl, and tert-butyl radicaladdition to the amide of 4-oxo-2-pentenoic acid (1) gave approximately equal amounts of addition at the carbonyl and amide ends of the alkene. This approach provides the highest reported stereoselectivity for radicaladdition to an acyclic chiral alkene. Furthermore, a rationale for the diastereoselectivity is
Catalytic Synthesis of 1<i>H</i>-2-Benzoxocins: Cobalt(III)-Carbene Radical Approach to 8-Membered Heterocyclic Enol Ethers
作者:Minghui Zhou、Lukas A. Wolzak、Zirui Li、Felix J. de Zwart、Simon Mathew、Bas de Bruin
DOI:10.1021/jacs.1c10927
日期:2021.12.8
several opportunities for the synthesis of new bioactive compounds. The reactions are shown to proceed via cobalt(III)-carbene radical intermediates, which are involved in intramolecular hydrogen transfer (HAT) from the allylic position to the carbene radical, followed by a near-barrierless radical rebound step in the coordination sphere of cobalt. The proposed mechanism is supported by experimental observations
使用顺磁性钴(II)卟啉催化剂[Co II (TPP)](TPP=四苯基卟啉)对邻烯丙基羰基-芳基N-芳基磺酰腙进行金属自由基活化,为合成新型8元杂环化合物提供了一种有效且强大的方法烯醇醚。该合成方案通用且实用,能够以高产率合成多种独特的 1 H -2-苯并氧辛。催化环化反应具有优异的化学选择性,具有较高的官能团耐受性,并为合成新的生物活性化合物提供了多种机会。该反应通过钴(III)-卡宾自由基中间体进行,该中间体参与从烯丙基位置到卡宾自由基的分子内氢转移(HAT),然后在钴的配位层中进行近无障碍的自由基反弹步骤。所提出的机制得到了实验观察、密度泛函理论(DFT)计算和自旋捕获实验的支持。