New Radical Approaches to 3-Deoxy-<scp>d</scp>-oct-2-ulosonic Acids (KDO)
作者:Torsten Linker、Boo Geun Kim、Uwe Schilde
DOI:10.1055/s-2005-865325
日期:——
led to key intermediates in the synthesis of 3-deoxy-D-oct-2-ulosonic acids (KDO). Manganese(III) acetate and cerium(IV) ammonium nitrate were the reagents of choice for the oxidative generation of radicals, whereas samarium(II) iodide was employed for reductivecouplings. Both strategies were realized by using easily available starting materials, with acetic acid as C 2 and ethyl acrylate as C 3
两种不同的方法,用不饱和碳水化合物作为自由基受体和碳水化合物衍生的醛作为自由基前体,导致合成 3-脱氧-D-辛-2-超声酸 (KDO) 的关键中间体。乙酸锰 (III) 和硝酸铈 (IV) 铵是自由基氧化生成的首选试剂,而碘化钐 (II) 用于还原偶联。这两种策略都是通过使用容易获得的起始材料实现的,分别以乙酸作为 C 2 和丙烯酸乙酯作为 C 3 结构单元。
Manganese(III)-Mediated Radical Reactions in Carbohydrate Chemistry: A New Route to 3-Deoxy-<scp>d</scp>-<i>manno</i>-oct-2-ulosonic Acid (KDO)
作者:Torsten Linker、Klaus Hartmann、Boo Kim
DOI:10.1055/s-2004-835648
日期:——
from a carbohydrate is employed as a substrate for manganese-mediated radical reactions for the first time. The addition of malonate is interesting for the mechanism of such reactions, whereas acetic acid as radical precursor affords lactones in excellent yield. The main diastereomer was easily separated and represents a key intermediate in the synthesis of KDO.
源自碳水化合物的无环烯烃首次被用作锰介导的自由基反应的底物。丙二酸的添加对于此类反应的机制很有趣,而乙酸作为自由基前体以优异的产率提供内酯。主要的非对映体很容易分离,是合成 KDO 的关键中间体。
Karrer; Davis, Helvetica Chimica Acta, 1948, vol. 31, p. 1614