(Chiral) lithium–(magnesium–)zinc and lithium–cobalt combinations as dual reagents for aromatic deproto-metalation and aryl transfer to aldehydes
作者:David Tilly、Katia Snégaroff、Gandrath Dayaker、Floris Chevallier、Philippe C. Gros、Florence Mongin
DOI:10.1016/j.tet.2012.08.008
日期:2012.10
the deprotonating ability of mixed lithium–cobalt combinations containing amido and alkyl ligands were compared using anisole as substrate and anisaldehyde to trap the formed arylmetal species. As before, the deprotonating ability is reduced when 2,2,6,6-tetramethylpiperidino ligands are replaced by less hindered/basic alkyls or chiral amido. The trapping step using aldehydes being in this case more