Palladium-metalated
PCN-222 enables the aerobic photo-oxidative
cross-condensation of anilines with benzylic amines yielding a series
of linear and cyclic imines. The reaction is very efficient under
mild conditions, which allows the isolation of simple, yet elusive,
intermediates such as 2-(benzylideneamino)aniline and 2-(benzylideneamino)phenols.
Recyclability studies show excellent activity and selectivity after
five runs. The methodology was successfully applied for the synthesis
of an antitumor agent (PMX-610).
A novel iron‐catalyzed borylation of propargylic acetates leading to allenylboronates has been developed. The method allows the preparation of a variety of di‐, tri‐ and tetrasubstituted allenylboronates at room temperature with good functional group compatibility. Stereochemical studies show that an anti‐SN2’ displacement of acetate by boron occurs; this also allows transfer of chirality to yield enantiomerically enriched allenylboronates. The synthetic utility of this protocol was further substantiated by transformations of the obtained allenylboronates including oxidation and propargylation.
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