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37
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27744477745
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note
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-1, retention times (R)-6b 7.5 mins, (S)-6b 8.4 mins. From optical rotation data for the single enantiomers of 5a, 3a and 2a we assumed no racemisation occurred as the route was identical to that for the synthesis of 6b and this was verified by later analysis of similar series.
-
-
-
-
38
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27744442831
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note
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-1, retention times for (E)-7b 29.0 mins and 31.2 mins.
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-
-
-
40
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27744595704
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note
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This temperature is from our observations on attempted enantioselective aza-[2,3]-Wittig rearrangements with chiral benzylic anions. See ref. 3.
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41
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0001474132
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48
-
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27744442976
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note
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2O, in the presence of DMAP and higher boiling DMF.
-
-
-
-
49
-
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27744470260
-
-
note
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-1, retention times for (R)-9a 14.2 mins, (S)-9a 16.0 mins and (S)-9b 11.6, (R)-9b 16.2.
-
-
-
-
52
-
-
27744517057
-
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note
-
-1, retention times (E,S)-13b 59.7 mins and (E,R)-13b 63.6 mins.
-
-
-
-
55
-
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0011369773
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(b) D. N. Gupta, P. Hodge and J. E. Davies, J. Chem. Soc., Perkin Trans. I, 1981, 2970.
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56
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0032476172
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J. M. Padron, G. Kokotos, T. Martin, T. Markidid, W. A. Gibbons and V. S. Martin, Tetrahedron; Asymmetry. 1998, 9, 3381.
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Gibbons, W.A.5
Martin, V.S.6
-
57
-
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27744510939
-
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note
-
The corresponding TBS protected serieswas synthesised, but this suffered from a difficult selective Boc deprotection step that proceeded in only 39% yield.
-
-
-
-
58
-
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27744473180
-
-
note
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-1, retention times for (S)-16 18.4, (R)-16 24.0.
-
-
-
-
59
-
-
27744496687
-
-
note
-
-1, retention times (E,S)-17 8.4 mins, (E,S)-17 13.3 mins.
-
-
-
-
60
-
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27744594537
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-
note
-
-1, retention times (S)-18 9.9 mins, (R)-18 19.0 mins.
-
-
-
-
61
-
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27744550300
-
-
note
-
3).
-
-
-
-
62
-
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27744487735
-
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note
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-1, retention times (E,R)-19 14.6 mins, (E,S)-19 16.1 mins.
-
-
-
-
63
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37049068853
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J. S. Davies, C. L. Higginbotham, E. J. Treemer, C. Brown and R. C. Treadgold, J. Chem. Soc., Perkin Trans. 1, 1992, 10, 3043.
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Davies, J.S.1
Higginbotham, C.L.2
Treemer, E.J.3
Brown, C.4
Treadgold, R.C.5
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