Abstract
Metal-oxenoid, -nitrenoid, and -carbenoid are potent active species
and react with C=C and C-H bonds, forming C-O, C-N
and C-C bonds, respectively. When the metal ion carries
an appropriate chiral ligand, these bond-forming reactions occur
in an enantioselective manner. In the last decade, many well-designed salen
ligands have been found to serve as efficient chiral auxiliaries for
these reactions. In this article are described highly enantioselective
oxene, nitrene, and carbene transfer reactions using chiral first- and
second-generation metallosalen complexes as catalysts. In addition
to these reactions, asymmetric oxidation using metallosalen complexes
as the catalyst and molecular oxygen or hydrogen peroxide as the
terminal oxidant is also described.
Key words
asymmetric catalysis - metallosalen complex - epoxidation - cyclopropanation - molecular
oxygen
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