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N,N- and N,S-ligands for the enantioselective hydrosilylation of acetophenone with iridium catalysts

✍ Scribed by Iyad Karamé; M Lorraine Tommasino; Marc Lemaire

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
164 KB
Volume
196
Category
Article
ISSN
1381-1169

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✦ Synopsis

Enantiomerically pure C 2 -symmetric diamines and dithioureas as well as a series of monothioureas have been tested as chiral inducers for hydrosilylation of acetophenone with iridium catalysts. Some new N,S-ligands have been synthesized in good yields, one of them bearing four chiral centers. Enantioselectivities with dithioureas are better than the ones observed with analog diamine ligands. Up to 74% e.e. was reached for acetophenone hydrosilylation with a 10-fold excess of ligand versus iridium precursor.

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