Cobalt(III)-Catalyzed [4 + 2] Annulation of <i>N</i>-Chlorobenzamides with Maleimides
作者:Nachimuthu Muniraj、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.orglett.8b04117
日期:2019.2.15
A Co(III)-catalyzed novel [4 + 2] annulation of N-chlorobenzamides with maleimides has been reported. Mostly, maleimides are known to furnish the Michael-type or 1,1-type cyclized products while treating with amides. In this reaction, maleimides furnished [4 + 2] annulated products in good yields at room temperature while being treated with the internal oxidizing N-chlorobenzamide as a directing group
Cobalt(III)-Catalyzed C–H Activation/Annulation Cascade Reaction of N-Chlorobenzamides with 2-Acetylenic Ketones at Room Temperature
作者:Yong Wu、Zhouping Wu、Qinwen Zheng、Guanghui Lv、Ruizhi Lai、Yao Hu、Li Hai
DOI:10.1055/a-1794-1314
日期:2022.7
N-chlorobenzamides with 2-acetylenic ketones at roomtemperature is reported. This reaction sets N–Cl bond of N-chlorobenzamide as an internal oxidant, displaying broad functional group tolerance and excellent reverse selectivity of alkyne insertion under mild and safe conditions. The cascade reaction offers a straightforward and mild protocol to construct isoquinolones in high yields at room temperature
Reverse Regioselective Cp*Co(III)-Catalyzed [4 + 2] C–H Annulation of <i>N</i>-Chloroamides with Vinylsilanes: Synthesis of 4-Silylated Isoquinolones and Their Synthetic Utilities
作者:Arijit Ghosh、Tamanna Rana、Nilanjan Bhaduri、Amit B. Pawar
DOI:10.1021/acs.orglett.3c03115
日期:2023.11.3
have developed a Cp*Co(III)-catalyzed reverse regioselective [4 + 2] annulation of N-chlorobenzamides/acrylamides with vinylsilanes for the synthesis of 4-silylated isoquinolones. The reaction was performed at ambient temperature under redox-neutral conditions. The reaction utilized the N–Cl bond as an internal oxidant, furnished the required products with excellent regioselectivities, and demonstrated
Ru(II)-Catalyzed Regioselective Redox-Neutral [4 + 2] Annulation of <i>N</i>-Chlorobenzamides with 1,3-Diynes at Room Temperature for the Synthesis of Isoquinolones
作者:Arijit Ghosh、Goraksha T. Sapkal、Amit B. Pawar
DOI:10.1021/acs.joc.3c00175
日期:——
Herein, we report Ru(II)-catalyzed C–H/N–H bond functionalization of N-chlorobenzamides with 1,3-diynes via regioselective (4 + 2) annulation for the synthesis of isoquinolones under redox-neutral conditions at roomtemperature. This represents the first example of C–H functionalization of N-chlorobenzamides using an inexpensive and commercially available [Ru(p-cymene)Cl2]2 catalyst. The reaction is