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11
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0000139463
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Nishiyama H., Itoh Y., Matsumoto H., Park S.-B., and Itoh K. J. Am. Chem. Soc. 116 (1994) 2223-2224
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13
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0033518561
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Evans D.A., Kozlowski M.C., Murry J.A., Burgey C.S., Campos K.R., Connell B.T., and Staples R. J. Am Chem. Soc. 121 (1999) 669-685
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Campos, K.R.5
Connell, B.T.6
Staples, R.7
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15
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0037418796
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For a recent report about the use of secondary binding sites for the asymmetric cyclopropanation of furans see
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For a recent report about the use of secondary binding sites for the asymmetric cyclopropanation of furans see. Schinnerl M., Bohm C., Seitz M., and Reiser O. Tetrahedron: Asymmetry 14 (2003) 765-771
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Schinnerl, M.1
Bohm, C.2
Seitz, M.3
Reiser, O.4
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17
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34047187328
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note
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All the new products were fully characterized and show spectral data in agreement with the proposed structure.
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18
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34047151128
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note
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Other combinations such as tosyl chloride/triethylamine or the use of Burgess reagent gave the product in lower yields or did not work at all.
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24
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10244222363
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For a PEG-supported bis(oxazoline)-copper(II) promoted reaction in water see
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For a PEG-supported bis(oxazoline)-copper(II) promoted reaction in water see. Benaglia M., Cinquini M., Cozzi F., and Celentano G. Org. Biomol. Chem. 2 (2004) 3401-3407
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Org. Biomol. Chem.
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Benaglia, M.1
Cinquini, M.2
Cozzi, F.3
Celentano, G.4
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25
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0033575446
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For the same reaction promoted by bis(oxazoline)-copper (II) complexes in aqueous solvents see
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For the same reaction promoted by bis(oxazoline)-copper (II) complexes in aqueous solvents see. Kobayashi S., Nagayama S., and Busujiama T. Tetrahedron 55 (1999) 8739-8746
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(1999)
Tetrahedron
, vol.55
, pp. 8739-8746
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Kobayashi, S.1
Nagayama, S.2
Busujiama, T.3
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26
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34047142511
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note
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2 complex catalysed the reaction in 41% yield basically without stereoselection.
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27
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0000070865
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Evans D.A., Peterson G.S., Johnson J.S., Barnes D.M., Campos K.R., and Woerpel K.A. J. Org. Chem. 63 (1998) 4541-4544
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J. Org. Chem.
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Evans, D.A.1
Peterson, G.S.2
Johnson, J.S.3
Barnes, D.M.4
Campos, K.R.5
Woerpel, K.A.6
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28
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34047136957
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note
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6)/ligand 1 complex at RT promoted the reaction with 7% ee. The result seems to suggest that the addition of a sidearm in the ligand has some beneficial effect on the enantioselectivity of the process. In this sense the figure of Scheme 2 represents a very preliminary working model that accounts for the formation of the product (S)-15.
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29
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34047156422
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note
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At the present based on these preliminary results it would be premature to invoke the presence of π-π interactions.
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30
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34047186186
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note
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For a discussion on the stereochemical models for bis(oxazolines) copper(II) complexes see Refs. [8,2c].
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31
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34047118446
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note
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1-symmetric bis(oxazoline) might bring about the formation of two different complexes; our working hypothesis is that for steric reasons one should be favoured over the other; of course also the control of the approach of the aldehyde is another point that deserves further studies. Preliminary attempted NMR studies showed the presence of more than one species in solution.
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32
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8744245317
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For other catalysts prepared following the same design principles see:
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For other catalysts prepared following the same design principles see:. Le J.C.-D., and Pagenkopf B.L. Org. Lett. 6 (2004) 4097
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(2004)
Org. Lett.
, vol.6
, pp. 4097
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Le, J.C.-D.1
Pagenkopf, B.L.2
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