Synthesis of Benzimidazoles by PIDA-Promoted Direct C(sp<sup>2</sup>)H Imidation of<i>N</i>-Arylamidines
作者:Jinbo Huang、Yimiao He、Yong Wang、Qiang Zhu
DOI:10.1002/chem.201202271
日期:2012.10.29
A metal‐free synthesis of diversified benzimidazoles from N‐arylamidines through a phenyliodine(III) diacetate (PIDA) promoted intramolecular direct C(sp2)H imidation has been developed. The reaction proceeds smoothly at 0 °C or ambient temperature to provide the desired products in good to excellent yields. The synthesis of 2‐alkyl‐ or 2‐alkyl‐fused benzimidazoles, which are generally inaccessible
Synthesis of substituted imidazopyridines from perfluorinated pyridine derivatives
作者:Alireza Poorfreidoni、Reza Ranjbar-Karimi
DOI:10.1016/j.tetlet.2016.11.045
日期:2016.12
4-Phenylsulfonyl tetrafluoropyridine was reacted with various N-aryl amidines to give the corresponding imidazopyridine systems via an intramolecular nucleophilic aromatic substitution process whilst pentafluoropyridine gave N′-(perfluoropyridin-4-yl)-N-phenylbenzimidamide and 2,3,5,6-tetrafluoro-N-phenylpyridin-4-amine by a competing elimination reaction.
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。
Vinylene carbonate: beyond the ethyne surrogate in rhodium-catalyzed annulation with amidines toward 4-methylquinazolines