Tertiary amine synthesis via reductive coupling of amides with Grignard reagents. Issue 11 (20th September 2017)

• Record Type: Journal Article
• Authors: Xie, Lan-Gui; Dixon, Darren J.
• Is Part Of: Chemical science. Volume 8:Issue 11(2017)
• Page Start: 7492
• Page End: 7497
• Publication Date: 2017-09-20
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7sc03613b
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : A new iridium catalyzed reductive coupling reaction of Grignard reagents and tertiary amides affording functionalised tertiary amine products is described. Abstract : A new iridium catalyzed reductive coupling reaction of Grignard reagents and tertiary amides affording functionalised tertiary amine products via an efficient and technically-simple one-pot, two-stage experimental protocol, is reported. The reaction – which can be carried out on gram-scale using as little as 1 mol% Vaska's complex [IrCl(CO)(PPh3 )2 ] and TMDS as the terminal reductant for the initial reductive activation step – tolerates a broad range of tertiary amides from (hetero)aromatic to aliphatic (branched, unbranched and formyl) and a wide variety of alkyl (linear, branched), vinyl, alkynyl and (hetero)aryl Grignard reagents. The new methodology has been applied directly to bioactive molecule synthesis and the high chemoselectivity of the reductive coupling of amide has been exploited in late stage functionalization of drug molecules. This reductive functionalisation of tertiary amides provides a new and practical solution to tertiary amine synthesis.