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19944375026
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32
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19944396077
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note
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1H NMR NOE experiments. A tentative explanation for the reversal in the facial selectivity of the epoxidation of the Diels-Alder adducts is that while the methylene group of the spiro-lactone ring placed at a pseudo-axial position of the enone ring in the transition state for 3a, it is placed at a pseudo-equatrial position in the case of 3b to avoid repulsion between the CbzNH group and the reagent;
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33
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19944405692
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6: C, 66.83; H, 5.35; N, 3.54%. Found: C, 66.71; H, 5.55; N, 3.48%
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6: C, 66.83; H, 5.35; N, 3.54%. Found: C, 66.71; H, 5.55; N, 3.48%;
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34
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19944418724
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6: C, 66.83; H, 5.35: N, 3.54%. Found: C, 66.87; H, 5.34; N, 3.54%
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6: C, 66.83; H, 5.35: N, 3.54%. Found: C, 66.87; H, 5.34; N, 3.54%.
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36
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0021134827
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41
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19944403823
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-
The numbering system of 5 was based on that of 4
-
The numbering system of 5 was based on that of 4.
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42
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0346326023
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2242478440
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50
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19944363071
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Bromination at the C4 position via enolization of 18 with LDA also failed
-
Bromination at the C4 position via enolization of 18 with LDA also failed.
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-
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51
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19944396709
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The calculations were performed with PC Spartan Pro, Wavefunction, Inc., Irvine, CA 92715
-
The calculations were performed with PC Spartan Pro, Wavefunction, Inc., Irvine, CA 92715.
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