Selective annulation of benzamides with internal alkynes catalyzed by an electron-deficient rhodium catalyst
作者:Ping Zhang、Wenju Chang、Hongyun Jiao、Yanshang Kang、Wenxuan Zhao、Peipei Cui、Yong Liang、Wei-Yin Sun、Yi Lu
DOI:10.1016/j.cclet.2021.01.024
日期:2021.5
s with internalalkynes was successfully established under mild reaction conditions, with the assistance of Lewis acid silver salt. Particularly, electron-deficient benzamide substrates were smoothly transformed into the desired products in this catalytic system. The catalytic system showed a broad tolerance for different substituents on the aromatic rings or aryl, alkyl-substituted alkynes.
在路易斯酸银盐的辅助下,在温和的反应条件下成功建立了电子缺陷[Cp E RhCl 2 ] 2催化的N-五氟苯基苯甲酰胺与内部炔烃的环化反应。尤其是,在该催化体系中,缺电子的苯甲酰胺底物可以平稳地转化为所需的产物。催化体系显示出对芳环或芳基,烷基取代的炔烃上不同取代基的宽容度。
Rhodium(III)-Catalyzed C(sp<sup>2</sup>)–H Chemoselective Annulation to O-Cyclized Isochromen-imines from Benzamides
作者:Ping Zhang、Wenju Chang、Yan-Shang Kang、Wenxuan Zhao、Pei-Pei Cui、Yong Liang、Wei-Yin Sun、Yi Lu
DOI:10.1021/acs.orglett.0c03425
日期:2020.12.18
selective annulation of benzamides with internal alkynes has been achieved to the formation of O-cyclized isochromen-imines. Various substituents are well-tolerated under mild reaction conditions. Density functional theory calculations indicate that silver carbonate could act as a Lewis acid to assist the ligand to improve the chemical selectivity of the reaction in a catalyticsystem.