A flexible total synthesis of the 2-nitropyrrole-derived marine natural product, (+)-heronapyrrole C, is reported. The approach is based on regioselective access to key building blocks containing the rare 4-substituted 2-nitropyrrole motif. Sharp less asymmetric epoxidation and dihydroxylation and a Shi epoxidation were used to introduce the five stereogenic centers of the bis-THF-diol side chain. The N-benzoyloxymethyl (Boz) protecting group was crucial for functionalization of the 2-nitropyrrole moiety and enabling final deprotection under mild conditions.
Vicarious nucleophilic substitution of hydrogen in nitroderivatives of five-membered heteroaromatic compounds
作者:Mieczyslaw Makosza、Ewa Kwast
DOI:10.1016/0040-4020(95)00445-e
日期:1995.7
Nitro derivatives of thiophene, furan and pyrrole react with carbanions containing leaving groups giving products of replacement of hydrogen with functionalized alkyl substituents. Many specific features of this reaction are discussed.
Synthesis and transformations of pyrrolo[1,2-a][1,3,5]-triazines
作者:Jonas Verhoeven、B. Narendraprasad Reddy、Lieven Meerpoel、Jan Willem Thuring、Guido Verniest
DOI:10.1016/j.tetlet.2018.11.002
日期:2018.12
Pyrrolotriazines and related fused azaheterocycles have high potential for the synthesis of bioactive compounds, especially as a purine base isoster in carbon linked nucleosides. Although many structurally related compounds have already been synthesized and used in medicinal chemistry, pyrrolo[1,3,5]triazines have barely been described. The present work describes the synthesis of such heterocycles
Palladium-Catalyzed Dynamic Kinetic Asymmetric Transformations of Vinyl Aziridines with Nitrogen Heterocycles: Rapid Access to Biologically Active Pyrroles and Indoles
作者:Barry M. Trost、Maksim Osipov、Guangbin Dong
DOI:10.1021/ja1071509
日期:2010.11.10
heterocycles can serve as competent nucleophiles in the palladium-catalyzed dynamic kinetic asymmetric alkylation of vinyl aziridines. The resulting alkylated products were obtained with high regio-, chemo-, and enantioselectivity. Both substituted 1H-pyrroles and 1H-indoles were successfully employed to give exclusively the branched N-alkylated products. The synthetic utility of this process was demonstrated
我们报告说,氮杂环可以在钯催化的乙烯基氮丙啶动态动力学不对称烷基化中作为有能力的亲核试剂。得到的烷基化产物具有高区域选择性、化学选择性和对映选择性。取代的 1H-吡咯和 1H-吲哚都被成功地用于得到支化的 N-烷基化产物。通过将该方法应用于制备几种药物化学先导化合物和溴吡咯生物碱,包括 longamide B、longamide B 甲酯、hanishin、agesamides A 和 B 以及环碘酮,证明了该方法的合成效用。
Trichloroisocyanuric acid (TCCA) and carboxamide interactions in TCCA/NaNO
<sub>2</sub>
triggered nitration of pyrrole and indole in aqueous aprotic media: A kinetic correlation of solvent properties with reactivity
This study deals with the trichloroisocyanuric acid (TCCA) interactions with carboxamides like formamide (FMA), N,N′‐dimethylformamide (DMF), and N,N′‐dimethyl acetamide (DMA) interactions during the nitration of heterocyclic compounds (HC) like pyrrole and indole in the presence of excess of [NaNO2] over the concentrations of all other reactants. All the reactions were performed in aqueous acetonitrile
这项研究涉及三氯异氰尿酸(TCCA)与羧酰胺如甲酰胺(FMA),N,N'-二甲基甲酰胺(DMF)和N,N'-二甲基乙酰胺(DMA)相互作用在杂环化合物(HC)硝化过程中的相互作用[NaNO 2 ]的量超过所有其他反应物的浓度时,像吡咯和吲哚一样。所有反应均在无酸条件下在含有羧酰胺的乙腈水溶液中进行。反应动力学揭示了在[硝化剂]和[HC]中在其他相似条件下的一级反应。为了深入了解添加的羧酰胺(FAA,DMF,DMA等)的反应性种类和作用,观察到的硝化反应速率(log k)被分析为(1 / D),([ D -1] / [2 D + 1]),摩尔分数(n x)和羧酰胺体积(%)的函数,1 /粘度,密度折射率函数)和Hildebrand溶解度参数图。线性回归分析给出了很好的相关系数(R 2值),表明除了反应介质的介电常数(D)的作用外,几种溶剂性质的重要性。亚伯拉罕,科佩尔,棕榈和塔夫脱提出的多种
Potassium Periodate/NaNO<sub>2</sub>
/KHSO<sub>4</sub>
-Mediated Nitration of Aromatic Compounds and Kinetic Study of Nitration of Phenols in Aqueous Acetonitrile
作者:Y. Hemanth Sriram、Touheeth Fatima、K. C. Rajanna、M. Satish Kumar、R. Madhusudan Raju
DOI:10.1002/kin.21102
日期:2017.8
Synthesis and kinetics of potassium periodate(KIO4)/NaNO2/KHSO4)‐initiated nitration of aromaticcompounds have been studied in aqueous acetonitrile medium. Synthesis of nitroaromatic compounds is achieved under conventional and solvent‐free microwave conditions. Reaction times in microwave‐assisted reaction are comparatively less than in conventional reaction. The reaction kinetics for the nitration