Iodine-catalyzed oxidative functionalization of purines with (thio)ethers or methylarenes for the synthesis of purin-8-one analogues
作者:Juanping Zhuge、Ziyang Jiang、Wei Jiang、Gary Histand、Dongen Lin
DOI:10.1039/d1ob00118c
日期:——
An efficient oxidative functionalization of purine-like substrates with (thio)ethers or methylarenes under mild conditions is described. Using I2 as the catalyst, and TBHP as the oxidant, this protocol provides a valuable synthetic tool for the assembly of a wide range of 9-alkyl(benzyl)purin-8-one derivatives with high atom- and step-economy and exceptional functional group tolerance.
描述了在温和条件下用(硫)醚或甲基芳烃对嘌呤样底物进行有效的氧化功能化。该协议使用 I 2作为催化剂,TBHP 作为氧化剂,为组装各种具有高原子经济性和阶梯经济性的 9-烷基(苄基)purin-8-one 衍生物提供了一种有价值的合成工具。官能团耐受性。
Metal-free C(sp<sup>2</sup>)–H functionalization of azoles: K<sub>2</sub>CO<sub>3</sub>/I<sub>2</sub>-mediated oxidation, imination, and amination
作者:Ranajit Das、Mainak Banerjee、Rakesh Kumar Rai、Ramesh Karri、Gouriprasanna Roy
DOI:10.1039/c8ob00535d
日期:——
available simple K2CO3/I2 reagent combination. The iodinated azole adduct, produced via the in situ generation of N-heterocyclic carbene, is the key intermediate for C2−H oxidation, imination, and amination of azoles. Significantly, these reactions proceed under mild conditions with high to excellent yields, are scalable to large quantity and exhibit a broad substrate scope. Interestingly, this direct
通过使用可商购的简单K 2 CO 3 / I 2试剂组合,可以实现多种唑类的直接C2-H氧化和亚胺化。碘化唑加成物,产生通过所述原位生成N-杂环碳烯的,为C2-H氧化,亚胺化,和唑类的胺化的关键中间体。重要的是,这些反应在温和的条件下以高至优异的产率进行,可扩展至大量并显示出广泛的底物范围。有趣的是,这种直接的C2-H胺化方法使我们能够获得各种具有药理活性的N 6-烷基或N 6芳基取代的苯并咪唑并喹唑啉酮骨架通过分子内CH串联进行一锅反应。
TEMPO‐Mediated Synthesis of
<i>N</i>
‐(Fluoroalkyl)imidazolones via Reaction of Imidazoles with Iodofluoroacetate
report a TEMPO‐mediated oxidativecopper‐catalyzed synthesis of N‐(fluoroalkyl)imidazolones via the radical addition of imidazoles with iodofluoroacetate. A possible key intermediate involving TEMPO was observed by ESI‐MS. We also found that aerobicoxidation conditions were effective for the transformation in the presence of a copper catalyst, enabling access to a number of N‐(fluoroalkyl)imidazolones
We report a H3PO3/I2 mediated formation of N-benzyl benzo heterocyclic ketones from the reaction of benzo heterocyclic compounds with aromatic aldehydes or benzyl alcohol derivatives under metal-free conditions in one-pot. For the first time, aromatic aldehydes were used as benzylated reagents to synthesize benzo heterocyclic ketones in the presence of K2CO3. Control experiments indicated that the
我们报告了 H 3 PO 3 /I 2介导的N-苄基苯并杂环酮的形成,该反应由苯并杂环化合物与芳香醛或苯甲醇衍生物在无金属条件下在一锅中反应。首次以芳香醛为苄基化试剂在K 2 CO 3存在下合成苯并杂环酮。对照实验表明羰基氧最有可能来源于K 2 CO 3。H 3 PO 3还起到促进剂和氢源的双重作用。这种新方法具有底物范围广、成本低、条件简单等特点。