Simple Catalytic Mechanism for the Direct Coupling of α-Carbonyls with Functionalized Amines: A One-Step Synthesis of Plavix
摘要:
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.
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.