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DOI: 10.1055/s-2002-25329
Addition of Organometallic Reagents to Imines Bearing Stereogenic N-Substituents. Stereochemical Models Explaining the 1,3-Asymmetric Induction
Publication History
Publication Date:
07 February 2007 (online)
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Abstract
The addition of organometallic reagents to imines bearing stereogenic N-substituents was investigated by ourselves and many other groups. From the results of these studies it appears that the sense of asymmetric induction and the degree of diastereoselectivity are affected by the structure of the imine (derived from mono- or bidentate aldehyde and/or amine), the nature of the organometallic reagent RMLn (the metal and its ligands, the structure of R, the degree of association), the presence of Lewis acids, and the solvent. The reaction pathways and the stereochemical models so far proposed are critically discussed and new ones are presented.
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1 Introduction
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2 1-Arylethylamines as the Auxiliaries
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2.1 Addition of Organolithium Reagents
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2.2 Addition of Allylic Organometallic Reagents
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2.3 Addition of Organometallic Reagents to the Glyoxal
Diimine -
2.4 Lewis Acid-Mediated Addition of Organometallic
Reagents -
3 α-Aminoacid Esters as the Auxiliaries
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4 β-Aminoalcohols and their O-Substituted Derivatives as
the Auxiliaries -
5 Conclusions: New Stereochemical Models for the
1,3-Asymmetric Induction
Key words
amines - 1,3-asymmetric induction - chiral auxiliaries - imines - organometallic reactions - stereochemical models
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References
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