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2
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0014447324
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Oxford University Press, Oxford
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M. Calvin, Chemical Evolution, Oxford University Press, Oxford, 1969
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(1969)
Chemical Evolution
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Calvin, M.1
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29
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46149104629
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All reactions in aqueous media were performed in triplicate
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All reactions in aqueous media were performed in triplicate
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31
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32044463187
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Y. Hayashi T. Sumiya J. Takahashi H. Gotoh T. Urushima M. Shoji Angew. Chem., Int. Ed. 2006 45 958
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(2006)
Angew. Chem., Int. Ed.
, vol.45
, pp. 958
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Hayashi, Y.1
Sumiya, T.2
Takahashi, J.3
Gotoh, H.4
Urushima, T.5
Shoji, M.6
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34
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46149125639
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Similar conditions in the presence of anionic surfactant such as sodium dodecylsulfate (SDS) produced only racemates For example reaction in NaCl (3.0 M) produced the syn- 3 with 44% ee. For discussion on the effects of added salts and their concentrations on reactivity in water see:
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Similar conditions in the presence of anionic surfactant such as sodium dodecylsulfate (SDS) produced only racemates
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35
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3242699566
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NMR analysis of the reaction mixture showed a significant equilibrium concentration of the imine 2
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R. Breslow Acc. Chem. Res. 2004 37 471
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(2004)
Acc. Chem. Res.
, vol.37
, pp. 471
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Breslow, R.1
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38
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46149113578
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One referee suggested the use of ethyl glyoxylate in excess to trap the p-anisidine. However, we were unable to observe any significant change in the selectivity The syn- 3 with 98% ee was let to stand in water at rt without any alteration of er or dr after three days. However, upon addition of p-anisidine, we observed isomerisation of syn- 3 into enantiopoor anti- 3, however, we were not able to assign the enantiomers
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One referee suggested the use of ethyl glyoxylate in excess to trap the p-anisidine. However, we were unable to observe any significant change in the selectivity
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39
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46149119752
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a = 6.95) isomerization of the anti-Mannich into syn-Mannich as reported by Barbas et al.
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a = 6.95) isomerization of the anti-Mannich into syn-Mannich as reported by Barbas et al.
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41
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3042698496
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A preliminary study showed that anti- 3, isolated from the reaction in DMF, catalyzed the formation of anti: syn- 3 (10: 9) mixture with no measurable selectivity. Work is currently under way to assess the catalytic effect of the enantiomerically pure anti- 3
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D. E. Ward M. Sales P. J. Sasmal J. Org. Chem. 2004 69 4808
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(2004)
J. Org. Chem.
, vol.69
, pp. 4808
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Ward, D.E.1
Sales, M.2
Sasmal, P.J.3
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43
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20344388819
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S. Narayan J. Muldoon M. G. Finn V. V. Fokin H. C. Kolb K. B. Sharpless Angew. Chem., Int. Ed. 2005 44 3275
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(2005)
Angew. Chem., Int. Ed.
, vol.44
, pp. 3275
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Narayan, S.1
Muldoon, J.2
Finn, M.G.3
Fokin, V.V.4
Kolb, H.C.5
Sharpless, K.B.6
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