Synthesis of bicyclic tetrahydropyridine enamides and enecarbamates by hetero-Cope rearrangement of nitroso cycloadducts
作者:Francesco Berti、Andrea Menichetti、Valeria Di Bussolo、Lucilla Favero、Mauro Pineschi
DOI:10.1007/s10593-018-2289-8
日期:2018.4
The hetero-Cope rearrangement reactions of inverse carbamate and amide nitroso Diels–Alder cycloadducts with 1,2-dihydropyridines to give novel tetrahydropyridine enamides and enecarbamates have been studied in detail identifying optimal reaction conditions. The possibility to obtain tetrahydropyridine enamides and carbamates containing a free OH at the C-4 position is restricted to only particular
氨基甲酸酯和酰胺亚硝基Diels-Alder环加成物与1,2-二氢吡啶的杂Cope重排反应可得到新颖的四氢吡啶烯酰胺和烯氨基甲酸酯,详细研究了最佳反应条件。当处理氨基甲酸酯亚硝基环加合物时,获得在C-4位上含有游离OH的四氢吡啶酰胺和氨基甲酸酯的可能性仅限于特定的取代方式。另一方面,从容易获得的酰胺亚硝基环加合物和催化量的亚铜盐开始,现在可以得到几种取代的4a,7,8a-四氢吡啶并[4,3- e ]-[1,4,2]二恶嗪产量中等至良好。
Heterogeneous Gold(I)‐Catalyzed Oxidative Ring Expansion of 2‐Alkynyl‐1,2‐Dihydropyridines or ‐Quinolines Towards Functionalized Azepines or Benzazepines
作者:Bingbo Niu、Quan Nie、Bin Huang、Mingzhong Cai
DOI:10.1002/adsc.201900512
日期:2019.9.3
A novel and efficient heterogeneous gold(I)‐catalyzed highly regio‐ and chemoselective oxidative ring expansion of 2‐alkynyl‐1,2‐dihydropyridines or ‐quinolines has been developed that proceeds smoothly through exclusive 1,2‐migration of a vinyl or phenyl group with pyridine N‐oxide as oxidant under mild conditions. The reaction provides a general and practical method for the synthesis of a wide variety
Copper-Catalyzed Coupling of Pyridines and Quinolines with Alkynes: A One-Step, Asymmetric Route to Functionalized Heterocycles
作者:Daniel A. Black、Ramsay E. Beveridge、Bruce A. Arndtsen
DOI:10.1021/jo702293h
日期:2008.3.1
[GRAPHICS]A copper (I)-catalyzed, asymmetric method to directly functionalize pyridines, quinolines, and isoquinolines with terminal alkynes is described. The reaction is readily diversified to incorporate a range of pyridine-based heterocycles and electron-rich or electron-poor alkynes. This provides a straightforward alternative to nucleophilic or cross-coupling approaches to directly derivatize these heterocycles, and yields useful propargylcarbamates.
Copper-Catalyzed Coupling of Imines, Acid Chlorides, and Alkynes: A Multicomponent Route to Propargylamides
作者:Daniel A. Black、Bruce A. Arndtsen
DOI:10.1021/ol036462+
日期:2004.4.1
The use of imines in a metal-catalyzed coupling with alkynes and acid chlorides is described. This process proceeds rapidly with Cul as the catalyst and provides an efficient and general three-component coupling method to prepare propargylamides. The coupling can also be diversified to allow the formation of N-carbamate-protected propargylamines with the use of chloroformates.