使用分子碘作为合成苯并咪唑衍生物的唯一氧化剂,已经实现了分子内芳基CH氨基化反应。通过将芳基胺与相应的腈或芳基碘加成或偶联,可以轻松制备所需的底物。在以碳酸钾(K 2 CO 3)为碱的情况下,这些底物的碘介导的氧化环化作用可提供中等至良好收率的相应产物。此处介绍的无过渡金属协议对空气不敏感,操作简单。这种通用且环保的合成方法学广泛适用于各种N芳基取代的am和吡啶2胺,可直接接触1 H来自相应前体的-苯并[ d ]咪唑和吡啶并[1,2- a ]苯并咪唑衍生物。
使用分子碘作为合成苯并咪唑衍生物的唯一氧化剂,已经实现了分子内芳基CH氨基化反应。通过将芳基胺与相应的腈或芳基碘加成或偶联,可以轻松制备所需的底物。在以碳酸钾(K 2 CO 3)为碱的情况下,这些底物的碘介导的氧化环化作用可提供中等至良好收率的相应产物。此处介绍的无过渡金属协议对空气不敏感,操作简单。这种通用且环保的合成方法学广泛适用于各种N芳基取代的am和吡啶2胺,可直接接触1 H来自相应前体的-苯并[ d ]咪唑和吡啶并[1,2- a ]苯并咪唑衍生物。
Synthesis of 1,3-Benzodiazepines through [5 + 2] Annulation of <i>N</i>-Aryl Amidines with Propargylic Esters
作者:Xia Song、Qianting Zhou、Jie Zhao、Yuqin Jiang、Xiaopeng Zhang、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.orglett.0c03515
日期:2020.12.18
In this paper, an efficient synthesis of functionalized 1,3-benzodiazepines through an unprecedented [5 + 2] annulation of N-aryl amidines with propargylic esters is presented. The reactions proceed through Rh(III)-catalyzed C(sp2)−H alkenylation followed by annulation and deacetoxylation along with cascade C−H/N−H/C−O bond cleavage and C−C/C−N bond formation. Furthermore, the cytotoxicity of selected
Synthesis of Spiro[benzo[<i>d</i>][1,3]oxazine-4,4′-isoquinoline]s via [4+1+1] Annulation of <i>N</i>-Aryl Amidines with Diazo Homophthalimides and O<sub>2</sub>
作者:Qianting Zhou、Xia Song、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.orglett.1c04193
日期:2022.2.18
Synthesis of spiro[benzo[d][1,3]oxazine-4,4′-isoquinoline]s through a unique [4+1+1] annulation of N-aryl amidines with diazo homophthalimides and O2 is presented. This unprecedented spirocyclization reaction features readily obtainable substrates, structurally and pharmaceutically attractive products, a cost-free and clean oxygen source, sustainable reaction medium, tolerance of a broad spectrum of
介绍了通过N-芳基脒与重氮高邻苯二甲酰亚胺和 O 2的独特 [4+1+1] 环化合成螺[苯并[ d ][1,3]恶嗪-4,4'-异喹啉]s 。这种前所未有的螺环化反应具有易于获得的底物、结构和药学上有吸引力的产品、免费且清洁的氧源、可持续的反应介质、广泛的官能团耐受性以及基于连续 C(sp 2 )的有趣反应机制–H/C(sp 3 )–H 键断裂和氧插入。
Rh(III)-Catalyzed Synthesis of 2-Alkylbenzimidazoles from Imidamides and <i>N</i>-Hydroxycarbamates
作者:Yanlin Li、Chunqi Jia、Huan Li、Linhua Xu、Lianhui Wang、Xiuling Cui
DOI:10.1021/acs.orglett.8b02057
日期:2018.8.17
An efficient tandem reaction of imidamides and N-hydroxycarbamates has been developed. Valuable 2-alkylbenzimidazoles could be easily obtained in up to 97% yield for more than 20 examples. The products would further streamline the synthesis of molecules, which are essential building blocks in organic synthesis and drug discovery. This protocol features high regioselectivity, efficiency, good tolerance
By employing elemental selenium as the selenium source, we have realized the amidine-directed Rh(III)-catalyzedcascade C–H selenylation/[5 + 1] annulation for the direct construction of structurally novel selenadiazine, benzoselenadiazine, and benzoselenazol-3-amine frameworks with specific site selectivity and good functional group tolerance. Besides, the obtained products can serve as fundamental