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