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77958186423
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Sibi has elegantly shown that related N-acyl pyrazolidinones can be used in asymmetric Diels-Alder reactions (and other cycloadditions); for select examples see
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41
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77958181377
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note
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1/2 ∼8 h) and preferential endo selectivity (exo:endo ratio 14:86).
-
-
-
-
42
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77958167757
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15N NMR, see Supplementary data.
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15N NMR, see Supplementary data.
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-
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43
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77958163582
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note
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2O (95:5) gave no change in reactivity. Catalyst 34 also returned only starting material using both cyclohexadiene and isoprene.
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44
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77958160765
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15N NMR chemical shifts, see Supplementary data.
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15N NMR chemical shifts, see Supplementary data.
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46
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0037214262
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Kita, Y.8
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