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19
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37049076394
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The ee of (R,E)-26 was assessed as >98% by 1H NMR chiral shift studies with (R)-trifluoroanthrylethanol and comparison with an authentic racemic standard For a synthesis of the analogous ethyl ester see:
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24
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33746456336
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For examples of conjugate addition of lithium amides to acyclic γ-alkoxy-α,β-unsaturated esters see:
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A. S. Kireev O. N. Nadein V. J. Agustin N. E. Bush A. Evidente M. Manpadi M. A. Ogasawara S. K. Rastogi S. Rogelj S. T. Shors A. Kornienko J. Org. Chem. 2006 71 5694
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44
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0023043811
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For a discussion of the selectivity observed upon conjugate addition of organocopper reagents to γ-alkoxy-α,β-unsaturated esters see:
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84943009986
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note
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An analogous argument was proposed by Yamamoto to explain the selectivity observed upon conjugate addition of lithium N-benzyl-N-trimethylsilylamide 6 and lithium dibenzylamide 12 to a range of mandelate- and lactate-derived α,β-unsaturated esters; see reference 6 within.
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Stein, K.A.17
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53
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0035900461
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The relative 3,4-anti-configuration of 39 determined from the X-ray crystal structure also allows the assigned relative 3,4-anti-configuration within β-amino ester 31 to be unambiguously confirmed It seems likely that epimerisation of the lactone rather than the ester is taking place as lactones are know to be relatively acidic; for selected examples see:
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