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Synthesis 2004(14): 2266-2272
DOI: 10.1055/s-2004-831167
DOI: 10.1055/s-2004-831167
PAPER
© Georg Thieme Verlag Stuttgart · New York
Highly Efficient Double-Activation Catalysts for the Synthesis of Ketone Cyanohydrins
Further Information
Received
30 April 2004
Publication Date:
13 August 2004 (online)
Publication History
Publication Date:
13 August 2004 (online)
Abstract
Tertiary cyanohydrin trimethylsilyl ethers were synthesized in excellent chemical yields by using salen-Al complex (0.25 mol%) and N-oxide (0.5 mol%) without solvent at ambient temperature. The relationship between the ligand structure and catalyst efficiency is discussed. Preliminary mechanistic studies were carried out, and transition states were proposed accounting for the action of the double-activation catalysts.
Key words
addition reactions - aluminum - ketones - Schiff bases - nitriles
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References
Compound 5a has been obtained in 94% ee using chiral salen-Al complex, which will be described in another paper.