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Wipf, B.; Kupfer, E.; Bertazzi, R.; Leuen-berger, H. G. W. Helv. Chim. Acta 1983, 66, 485. R Enantiomer: Seebach, D.; Zueger, M. Helv. Chim. Acta 1982, 65, 495. Kramer, A.; Pfander, H. Helv. Chim. Acta 1982, 65, 293. Ethyl (S)-3-hydroxybutanoate, methyl (R)-3-hydroxybutanoate and (R)-3-hydroxybutyric acid are commercially available from Fluka. (S)-3-Hydroxybutyric acid, sodium salt and (R)-3-hydroxybutyric acid, sodium salt are available from Aldrich.
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S Enantiomer: Seebach, D.; Sutter, M. A.; Weber, R. H.; Zueger, M. F. Org. Synth. 1984, 63, 1. Wipf, B.; Kupfer, E.; Bertazzi, R.; Leuen-berger, H. G. W. Helv. Chim. Acta 1983, 66, 485. R Enantiomer: Seebach, D.; Zueger, M. Helv. Chim. Acta 1982, 65, 495. Kramer, A.; Pfander, H. Helv. Chim. Acta 1982, 65, 293. Ethyl (S)-3-hydroxybutanoate, methyl (R)-3-hydroxybutanoate and (R)-3-hydroxybutyric acid are commercially available from Fluka. (S)-3-Hydroxybutyric acid, sodium salt and (R)-3-hydroxybutyric acid, sodium salt are available from Aldrich.
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For utilization of N-alkyl imines in enolate imine condensations, see
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Anti elimination of (8£,6S)-configurated 3-(hydroxyethyl)azetidinones is expected to produce Z-configurated enelactams. Because of ambiguous chemical shifts, we confirmed the structure of 25 according to a protocol (eq 3) reported by Merck.
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Anti elimination of (8£,6S)-configurated 3-(hydroxyethyl)azetidinones is expected to produce Z-configurated enelactams. Because of ambiguous chemical shifts, we confirmed the structure of 25 according to a protocol (eq 3) reported by Merck. Johnston, D. B. R.; Schmitt, S. M.; Bouffard, F. A.; Christensen, B. G. J. Am. Chem. Soc. 1978, 100, 313.
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