Asymmetric synthesis with "privileged" ligands*
Marco Bandini**, Pier Giorgio Cozzi, and Achille Umani-Ronchi
Dipartimento di Chimica "G. Ciamician", University
of Bologna, Via Selmi 2, I-40126 Bologna, Italy
Abstract: Different types of chiral "privileged" ligands
1 and 2 in promoting enantioselective addition of allylating agents
to aliphatic and aromatic aldehydes are described. Here, a new concept
in the asymmetric allylation reaction is presented. Redox [Cr (Salen) ]
mediated addition of allyl halides to carbonyl compounds is described,
and mechanistic investigations are discussed. These results open access
to the fascinating area of the catalytic redox processes mediated by
metallo-Salen complexes.
* Lecture presented at the XIXth International Conference
on Organometallic Chemistry (XIX ICOMC) , Shanghai, China, 23-28 July
2000. Other presentations are published in this issue, pp. 205-376.
** Corresponding author
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