Palladium-catalysed arylation of tert-cyclobutanols with arylbromide involving enantioselective C-Cbondcleavage affords chiral ketones with moderate to good enantioselectivity.
A novel enantioselective C-C bondcleavage has been achieved using palladium catalysts and chiral N,P-bidentate ligands in the asymmetric arylation, vinylation, and allenylation of tert-cyclobutanols. In these reactions, the enantioselective beta-carbon elimination of Pd(II) alcoholate formed in situ is the key step. Treatment of tert-cyclobutanols with arylating reagents in toluene in the presence
Ligand-Accelerated Pd-Catalyzed Ketone γ-Arylation via C–C Cleavage with Aryl Chlorides
作者:Asraa Ziadi、Ruben Martin
DOI:10.1021/ol300119u
日期:2012.3.2
efficient Pd-catalyzed arylative ring expansion of cyclobutanols viaC–Cbondcleavage is presented. The method allows the coupling of aryl chlorides at low catalyst loadings with a wide range of functional groups and substitution patterns, thus constituting a straightforward alternative for preparing rather elusive γ-arylatedketones.