Treatment of (α-aminoalkyl)lithium reagents with aryl
iodides in the presence of catalytic amounts
of CuCN and PdCl2(PPh3)2 or
[(p-MeOC6H4)3P]4Pd
affords 2-aryl substituted amines in modest to
good yields. The yields can be improved by use of softer ligands
such as AsPh3 and SbPh3 or by
use of bis(diphenylphosphino)ferrocene (dppf). Coupled products
are obtained with electron-rich
aryl iodides (XArI, X = Me, OMe), and the reaction fails with
electron-poor aryl iodides (XArI, X =
NO2, CO2Li). Treatment of the
(α-aminoalkyl)lithium reagents with vinyl iodides and
Pd(0)/dppf/CuCN afforded the coupling products in low to modest
yields.
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