Addressing Challenges in Palladium-Catalyzed Cross-Couplings of Aryl Mesylates: Monoarylation of Ketones and Primary Alkyl Amines
作者:Pamela G. Alsabeh、Mark Stradiotto
DOI:10.1002/anie.201303305
日期:2013.7.8
Mor(DalPhos) for Me(sylates): Described are the first examples of ketone mono‐α‐arylation and primary aliphatic aminemonoarylation employing aryl methanesulfonate coupling partners. A range of functionalized arylmesylates were employed with dialkyl ketones, and also with primary and secondary amines as well as the otherwise challenging coupling partners acetone and methylamine. Ad=adamantyl.
A novelcatalyticsystem based on copper(I) and chiral bis(phosphine) dioxides is described. This allows the arylation of silyl enol ethers to access enolizable α-arylated ketones in good yields and enantiomeric excess up to 95%. Noncyclic ketones are amenable substrates with this method, which complements other approaches based on palladium catalysis. Optimization of the ligand structure is accomplished