Structure–activity relationships of untenone A and its derivatives for inhibition of DNA polymerases
摘要:
We found that untenone A and mannzamenone A inhibit mammalian DNA polymerases alpha and beta, and human terminal deoxynucleotidyl transferase (TdT). The syntheses of both compounds and the structure-activity relationships of untenone A derivatives are described. (C) 2004 Elsevier Ltd. All rights reserved.
A total synthesis of the proposed structure of plakevulin A was accomplished. However, the NMR spectral data of the synthetic plakevulin A were not identical of those of the reported compound. We next converted the synthetic plakevulin A into 1-dihydrountenone A. The 1H and 13C NMR spectral data of 1-dihydrountenone A were identical with those of reported plakevulin A except for the peaks derived from
完成了所提出的全乳胶蛋白A结构的全合成。但是,人工合成的芹菜素A的NMR光谱数据与所报道化合物的NMR光谱数据并不相同。接下来,我们将合成的芦荟蛋白A转化为1-二氢烯酮A。1-二氢烯酮A的1 H和13 C NMR光谱数据与报道的芦荟蛋白A相同,除了从乙酰丙酸衍生的峰。因此,我们对天然产物的样品进行了纯化,并确认了天然样品中含有1-二氢烯酮A和乙酰丙酸的比例为1:1。我们还发现,不是香菇素A,而是1-二氢烯酮A具有对哺乳动物DNA聚合酶α和β的抑制活性。
Convenient synthesis of a marine cyclopentanoid: untenone A
(+/-)-Untenone A, one of the marine cyclopentanoids, has been conveniently synthesized via (+/-)-cis-1-hexadecylcyclopent-2- en-1,4 diol 9 which has been produced from 1-hexadecylcyclopenta-1,3-diene 6 via photo-oxidation and the following reduction. The key step of the present synthesis is the selective alkylation of cyclopenta-1,3-diene to form 6. Optically active (-)- and (+)-untenone A have been prepared from (-)- and (+)-9, respectively, after enzymatic kinetic resolution of (+/-)-9. (C) 2010 Elsevier Ltd. All rights reserved.