Chemoselective [3 + 2] annulation of oxime acetate with 2-aryl-3-ethoxycarbonyl-pyrroline-4,5-dione: an entry to pyrrolo[2,3-<i>b</i>]pyrrole derivatives
A novel chemoselective [3 + 2] annulation reaction of easily accessible ketoxime acetate with 2-aryl-3-ethoxycarbonyl pyrroline-4,5-dione has been developed for the synthesis of unknown pyrrolo[2,3-b]pyrrole frameworks. This method involves copper-mediated N–O bond cleavage followed by the formation of carbon–carbon and carbon–nitrogen bonds. This operationally simple protocol provides broader functional
A new route to substituted furocoumarins <i>via</i> copper-catalyzed cyclization between 4-hydroxycoumarins and ketoximes
作者:Tuong A. To、Yen H. Vo、Anh T. Nguyen、Anh N. Q. Phan、Thanh Truong、Nam T. S. Phan
DOI:10.1039/c8ob01064a
日期:——
A newroute to substituted furocoumarins via copper-catalyzed cyclization between 4-hydroxycoumarins and ketoximes was developed. CuBr2 exhibited higher activity than other copper salts, affording the desired furocoumarins in high yields. The transformation proceeded readily in the absence of stoichiometric external oxidants. The significance of this synthetic strategy would be (1) the easily available
An elemental sulfur atom donor strategy for constructing a thiophene-fused thiazole bis-S-heterocyclic skeletonviaCu-catalyzed three-component tandem cyclization has been developed.
一种通过铜催化的三组分串联环化反应构建噻吩-螺噻唑双硫杂环骨架的元素硫原子给体策略已经被开发。
Conversion of Pyridine to Imidazo[1,2-<i>a</i>]pyridines by Copper-Catalyzed Aerobic Dehydrogenative Cyclization with Oxime Esters
A rapid and environmentally friendly conversion of pyridine to imidazo[1,2-a]pyridines has been developed via copper-catalyzedaerobicdehydrogenativecyclization with ketone oxime esters.
通过铜与酮肟酯的需氧脱氢环化反应,已开发了吡啶向咪唑并[1,2- a ]吡啶的快速环保转化。
Copper-Catalyzed Radical/Radical C sp 3H/PH Cross-Coupling: α-Phosphorylation of Aryl Ketone<i>O</i>-Acetyloximes
作者:Jie Ke、Yuliang Tang、Hong Yi、Yali Li、Yongde Cheng、Chao Liu、Aiwen Lei
DOI:10.1002/anie.201501287
日期:2015.5.26
selective radical/radical cross‐coupling of two different organic radicals is a great challenge due to the inherent activity of radicals. In this paper, a copper‐catalyzed radical/radical CH/PH cross‐coupling has been developed. It provides a radical/radical cross‐coupling in a selective manner. This work offers a simple way toward β‐ketophosphonates by oxidative coupling of aryl ketone o‐acetyloximes