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Consequently, it is
necessary to develop air-stable, robust and well-defined Pdcomplexes
with inexpensive ligands. We have developed an
interest in exploring the utility of N/O-functionlized Nheterocyclic
carbenes in chemical catalysis, with special
emphasis on developing inexpensive, user-friendly, and highly
efficient precatalyst for C-C cross-coupling reactions.9 To explore
new efficient catalysts for Sonogashira coupling reactions, we
prepared a series of novel chiral NHC-palladium complexes from
the relatively inexpensive L-phenylalanine and reported on using
of these complexes to catalyze the copper-free Sonogashira
coupling reaction under aerobic conditions.
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