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For two pioneering reports, see: a) M. Marigo, T. Schulte, J. Franzén, K. A. Jorgensen, J. Am. Chem. Soc. 2005, 127, 15710;
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55249111616
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For some selected general reviews on asymmetric organocatalysis, see: a
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For some selected general reviews on asymmetric organocatalysis, see: a) P. Melchiorre, M. Marigo, A. Carlone, G. Bartoli, Angew. Chem. 2008, 120, 6232;
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special issue on organocatalysis Chem. Rev. 2007, 107(12);
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c) special issue on organocatalysis Chem. Rev. 2007, 107(12);
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a values of 16 and 17: D. A. Alonso, S. Kitagaki, N. Utsumi, C. F. Barbas III, Angew. Chem. 2008, 120, 4664;
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a values of 16 and 17: D. A. Alonso, S. Kitagaki, N. Utsumi, C. F. Barbas III, Angew. Chem. 2008, 120, 4664;
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See also f
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See also f) D. R. Li, A. Murugan, J. R. Falck, J. Am. Chem. Soc. 2008, 130, 46;
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a) S. Bertelsen, P. Diner, R. L. Johansen, K. A. Jorgensen, J. Am. Chem. Soc. 2007, 129, 1536.
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41
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36349020257
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For a similar reaction using enones as Michael acceptors, see: b
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For a similar reaction using enones as Michael acceptors, see: b) A. Carlone, G. Bartoli, M. Bosco, F. Pesciaioli, P. Ricci, L. Sambri, P. Melchiorre, Eur. J. Org. Chem. 2007, 5492.
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Eur. J. Org. Chem
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67650424959
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a) C. M. Reisinger, X. Wang, B. List, Angew. Chem. 2008, 120, 8232;
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b) X. Lu, Y. Liu, B. Sun, B. Cindric, L. Deng, J. Am. Chem. Soc. 2008, 130, 8134.
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45
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62249110220
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For an earlier example of an attempted amine-catalyzed conjugate addition of alcohols to enals furnishing low levels of enantioselection, see: a D. Díez, M. G. Nuñez, A. Benéitez, R. F. Moro, I. S. Marcos, P. Basabe, H. B. Broughton, J. G. Urones, Synlett 2009, 390;
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For an earlier example of an attempted amine-catalyzed conjugate addition of alcohols to enals furnishing low levels of enantioselection, see: a) D. Díez, M. G. Nuñez, A. Benéitez, R. F. Moro, I. S. Marcos, P. Basabe, H. B. Broughton, J. G. Urones, Synlett 2009, 390;
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46
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34447530438
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b) T. Kano, Y. Tanaka, K. Maruoka, Tetrahedron 2007, 63, 8658.
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Kano, T.1
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47
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70349900468
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The absolute configuration of the compounds 4 was assigned by analogy from the X-ray analysis of the corresponding O-acetyl p-chlorobenzoyl derivative of 4 b (see the Supporting Information). CCDC 723339 contains the supplementary crystallo-graphic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data-request/cif.
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The absolute configuration of the compounds 4 was assigned by analogy from the X-ray analysis of the corresponding O-acetyl p-chlorobenzoyl derivative of 4 b (see the Supporting Information). CCDC 723339 contains the supplementary crystallo-graphic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data-request/cif.
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48
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We also think that it is the dihydroxyacetone dimer 2 itself which acts as the oxygen nucleophile because reactions in solvents having the ability to retrodimerize 2, such as MeOH or THF, proceeded with very low conversions.
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We also think that it is the dihydroxyacetone dimer 2 itself which acts as the oxygen nucleophile because reactions in solvents having the ability to retrodimerize 2, such as MeOH or THF, proceeded with very low conversions.
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49
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The reaction of crotonaldehyde with hydroxyacetophenone under the optimized reaction conditions did not furnish any product; only unmodified starting materials were recovered
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The reaction of crotonaldehyde with hydroxyacetophenone under the optimized reaction conditions did not furnish any product; only unmodified starting materials were recovered.
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