Copper catalyzed five-component domino strategy for the synthesis of nicotinimidamides
作者:Yu Zhao、Li Li、Zitong Zhou、Man Chen、Weiguang Yang、Hui Luo
DOI:10.1039/d1ob00162k
日期:——
synthesized by a copper-catalyzed multicomponent domino reaction of oxime esters, terminal ynones, sulfonyl azides, aryl aldehydes and acetic ammonium. Its synthetic pathway involves the formation of a highly reactive N-sulfonyl acetylketenimine, characterized by high selectivity, combinations of potential nucleophiles and electrophiles, mild reaction conditions and a wide substrate scope, and is a rare
Copper‐Catalyzed Ring‐Opening (3+2) Annulation of Cyclopropenones with Ketoxime Acetates: Access to 1,2‐Dihydro‐pyrrol‐3‐ones Bearing a Quaternary Carbon Center
copper(I)-catalyzed ring-opening (3+2) annulation to achieve 1,2-dihydro-pyrrol-3-ones is established under redox-neutral conditions, in which ketoximeacetates served as C−N splicing unit. The developed protocol is characterized by good substrate tolerance on both ketoximeacetates and cyclopropenones.
An efficient approach for the synthesis of unsymmetrical and symmetrical multi-substituted pyridines is demonstrated. This process is preceded via iron−catalysed [3+3] annulation of oxime acetates with enaminones. Operational simplicity, use of easily available starting materials and inexpensive catalyst, avoiding the use of additives or ligands are the major advantages of this protocol.
Addition of Oxime Derivatives to Alkynyl Fischer Carbene Complexes
作者:Héctor F. González、Marina Blanco-Lomas、Laura Rivado-Casas、Miguel A. Rodrı́guez、Pedro J. Campos、Diego Sampedro
DOI:10.1021/om300570q
日期:2012.9.24
The addition of oxime derivatives to alkynyl Fischer carbene complexes has been explored through a combined experimental and computational approach. Up to four different heterocycles with diverse regiochemistry and ring size were found, depending on the starting ketone. The reaction mechanism was studied by DFT methods.
Palladium-catalyzed Heck-type reaction of oximes with allylic alcohols: synthesis of pyridines and azafluorenones
We describe herein a palladium-catalyzed Heck-type reaction of O-acetyl ketoximes and allylicalcohols to pyridines. This protocol allows robust synthesis of pyridines and azafluorenones in good to excellent yields with...