NIS-Catalyzed Reactions: Amidation of Acetophenones and Oxidative Amination of Propiophenones
作者:Manjunath Lamani、Kandikere Ramaiah Prabhu
DOI:10.1002/chem.201202703
日期:2012.11.12
Single‐step amination: The N‐iodosuccinimide (NIS)‐catalyzed amidation of acetophenone derivatives by using tert‐butylhydroperoxide (TBHP) as an oxidant is presented. A variety of acetyl derivatives of heterocyclic compounds were easily converted to their corresponding ketoamides under these conditions. A new, NIS‐catalyzed amination of propiophenone and its derivatives in the presence of TBHP to furnish
Simple Catalytic Mechanism for the Direct Coupling of α-Carbonyls with Functionalized Amines: A One-Step Synthesis of Plavix
作者:Ryan W. Evans、Jason R. Zbieg、Shaolin Zhu、Wei Li、David W. C. MacMillan
DOI:10.1021/ja4096472
日期:2013.10.30
The direct alpha-amination of ketones, esters, and aldehydes has been accomplished via copper catalysis. In the presence of catalytic copper(II) bromide, a diverse range of carbonyl and amine substrates undergo fragment coupling to produce synthetically useful alpha-amino-substituted motifs. The transformation is proposed to proceed via a catalytically generated alpha-bromo carbonyl species; nucleophilic displacement of the bromide by the amine then delivers the alpha-amino carbonyl adduct while the catalyst is reconstituted. The practical value of this transformation is highlighted through one-step syntheses of two high-profile pharmaceutical agents, Plavix and amfepramone.