The present invention is novel compounds which are 2-substituted amino-4,6-di-tertiarybutyl-5-hydroxy-1,3-pyrimidines and pharmaceutically acceptable acid addition or base salts thereof, pharmaceutical compositions and methods of use therefor. The invention compounds are described as having activity as inhibitors of 5-lipoxygenase and/or cyclooxygenase providing treatment of conditions advantageously affected by such inhibition including inflammation, arthritis, pain, fever and the like. Thus, the present invention is also a pharmaceutical composition or method of manufacturing a pharmaceutical composition for the use of treating the noted conditions.
transfer radical addition (ATRA) reaction of olefins using bromomalonates as halogen-bonding donors was developed. Using 4-phenylpyridine as the halogen-bonding acceptor, the desired reaction proceeded well under external irradiation of 380 nm light to furnish the corresponding ATRA reaction product. The ATRA reaction was effective in generating the corresponding products for a variety of olefins. Furthermore
Compounds, preferably 5-pyrimidinol and 3-pyridinol derivatives, that act as effective chain breaking antioxidants of both the lipid and water-soluble variety (analogous to the natural Vitamins E and C), many of which are more reactive toward peroxyl radicals than the most potent form of Vitamin E. These compounds may exhibit many chemopreventive effects associated with conditions in which free radical-mediated cellular damage or disruption is implicated and Vitamins E and C are shown to have protective effects. Additionally, these compounds should be excellent oxidation inhibitors as additives to fuels, lubricants, rubber, polymers, chemicals, solvents and foodstuffs.
The Effect of Ring Nitrogen Atoms on the Homolytic Reactivity of Phenolic Compounds: Understanding the Radical-Scavenging Ability of 5-Pyrimidinols
作者:Luca Valgimigli、Giovanni Brigati、Gian Franco Pedulli、Gino A. DiLabio、Marina Mastragostino、Catia Arbizzani、Derek A. Pratt
DOI:10.1002/chem.200304960
日期:2003.10.17
BDEs, 5-pyrimidinols appear to transfer their phenolichydrogen-atom to peroxyl radicals as quickly as equivalently substituted phenols, while their reactivity toward alkyl radicals far exceeds that of the corresponding phenols. We suggest that this rate enhancement, which is large in the case of alkyl radical reactions, small in the case of peroxyl radical reactions, and nonexistent in the case of
合成了六个取代的5-嘧啶醇,研究了它们与自由基反应的热化学和动力学,并将其与同等取代的酚进行了比较。为了评估其作为自由基的氢原子供体的潜力,我们使用自由基平衡电子顺磁共振技术测量了其OH键离解焓(BDE)。这表明,5-嘧啶醇中的OH BDE平均比同等取代的酚类中的高约2.5 kcal mol(-1)。结果与理论预测吻合良好,证实了取代基对5-嘧啶醇的OH BDE的影响与对苯酚中Obond; H BDE的影响基本相同。通过抑制AIBN引发的苯乙烯的自氧化,以及通过竞争动力学与烷基和烷氧基的反应,研究了这些化合物与过氧自由基的反应动力学。尽管它们的OH BDE较大,但5-嘧啶醇似乎将其酚氢原子转移到过氧自由基上的速度与同等取代的酚一样快,而它们对烷基自由基的反应性却远远超过了相应的酚。我们建议,这种速率的提高是由于这些原子的过渡态中的极性效应引起的,该速率的提高在烷基自由基反应的情况下较大,在
2,2,6,6-Tetramethylheptane-3,4,5-trione
作者:C. W. Shoppee、D. Stevenson
DOI:10.1039/p19720003015
日期:——
The preparation of 2,2,6,6-tetramethylheptane-3,4,5-trione, orange needles, m.p, 16°, is described together with some of its properties, and those of its derivatives.