We
report a straightforward and efficient Pd/enamine catalytic
procedure for the direct asymmetric α-allylation of branched
aldehydes. The use of simple chiral amines and easily prepared achiral
or racemic phosphoric acids, together with a suitable Pd-source resulted
in a highly active and enantioselective catalyst system for the allylation
of various α-branched aldehydes with different allylic alcohols.
The reported procedure could provide an easy access to both product
antipodes. Furthermore, two possible orthogonal derivatizations of
the enantioenriched aldehydes were performed without any decrease
in enantioselectivity.
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