Direct Synthesis of 3-Acylindoles through Rhodium(III)-Catalyzed Annulation of<i>N</i>-Phenylamidines with α-Cl Ketones
作者:Jianhui Zhou、Jian Li、Yazhou Li、Chenglin Wu、Guoxue He、Qiaolan Yang、Yu Zhou、Hong Liu
DOI:10.1021/acs.orglett.8b03383
日期:2018.12.7
versatile 3-acylindoles through Rh(III)-catalyzed C–H activation and annulation cascade of N-phenylamidines with α-Cl ketones was developed, in which α-Cl ketones serve as unusual one-carbon (sp3) synthons. This strategy features high regioselectivity, efficiency, wide substrate tolerance, and mild reaction conditions, which further underscore its synthetic utility in drug molecule synthesis.
One-Pot Protocol for the Synthesis of Imidazoles and Quinoxalines using<i>N</i>-Bromosuccinimide
作者:Sachin D. Pardeshi、Pratima A. Sathe、Kamlesh S. Vadagaonkar、Atul C. Chaskar
DOI:10.1002/adsc.201700900
日期:2017.12.11
N‐bromosuccinimide (NBS)‐mediated one‐pot, green, efficient and practical synthesis of substituted imidazoles and quinoxalines has been achieved by the reaction of styrenes with N‐arylbenzamidines and o‐phenylenediamines, respectively, in a water:1,4‐dioxane mixture. The reaction involves formation of an α‐bromo ketone as an intermediate in the presence of NBS and water, followed by condensation with
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
§ Authors contributed equally to this work. Abstract A copper-catalyzed expedient, practical, and straightforward approach for the one-pot three-component modular synthesis of multisubstituted imidazoles has been described by using arylacetic acids, N-arylbenzamidines, and nitroalkanes. The reaction involves simultaneous activation of C–H and N–H bonds of arylacetic acids and N-arylbenzamidines, respectively