Asymmetric Steering of Oxa Diels–Alder R
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Edwin Bläser; Patrik Kolar; Dieter Fenske; Hellmut Goesmann; Herbert Waldmann
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Article
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1999
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John Wiley and Sons
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English
⚖ 171 KB
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Chiral aldehydes 4a,b, obtained by the ozonolysis of the dihydro-γ-pyrones 13 with very high diastereomeric ratios (up to 99:1). The absolute configuration of the predominating corresponding N,NЈ-fumaroylbis[(S)-proline esters] 3 react in the presence of lanthanoid chelate complexes Eu(fod) 3 or dia