The first nickel-catalyzed asymmetric
decarboxylative allylation
(DcA) of allyl 2,2-diarylglycinate imines is reported. This transformation
utilizes a chiral ferrocenyl bidentate ligand and a Ni(0) precatalyst
to mediate the decarboxylative generation and asymmetric allylation
of 2-azaallyl anions, affording α-aryl homoallylic imines in
modest-to-high yields and moderate-to-high enantiomeric ratios. The
resulting Ni-catalyzed transformation proved to be less general in
comparison to our previously reported analogous Pd-mediated protocol,
but it still exhibited certain advantages in regard to the regio-
and enantioselectivity of the C–C bond formation.
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