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P. M. Pihko, Angew. Chem. 2004, 116, 2110; Angew. Chem. Int. Ed. 2004, 43, 2062.
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P. M. Pihko, Angew. Chem. 2004, 116, 2110; Angew. Chem. Int. Ed. 2004, 43, 2062.
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77
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66349119985
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The unexpected reversal of the absolute enantioselectivity is not fully understood and further examinations are necessary. However, not only steric and electric factors, but also the repulsion between 3,3'-substituents of the BINOL skeleton and the bulky Dpp group of 1a should be involved
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The unexpected reversal of the absolute enantioselectivity is not fully understood and further examinations are necessary. However, not only steric and electric factors, but also the repulsion between 3,3'-substituents of the BINOL skeleton and the bulky Dpp group of 1a should be involved.
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78
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0000629708
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and references therein
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K. Mai, G. Patil, J. Org. Chem. 1986, 51, 3545, and references therein.
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Mai, K.1
Patil, G.2
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80
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H. E. Zaugg, J. F. Ratajczyk, J. E. Leonard, A. D. Schaefer, J. Org. Chem. 1972, 37, 2249.
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Leonard, J.E.3
Schaefer, A.D.4
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82
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0000307941
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A negative nonlinear effect (NLE) was observed in the absence of PBAP and a proposed dimer species is described in the Supporting Information. For reviews on NLE studies, see: a) D. Guillaneux, S. H. Zhao, O. Samuel, D. Rainford, H. B. Kagan, J. Am. Chem. Soc. 1994, 116, 9430.
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A negative nonlinear effect (NLE) was observed in the absence of PBAP and a proposed dimer species is described in the Supporting Information. For reviews on NLE studies, see: a) D. Guillaneux, S. H. Zhao, O. Samuel, D. Rainford, H. B. Kagan, J. Am. Chem. Soc. 1994, 116, 9430.
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83
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M. Avalos, R. Babiano, P. Cintas, J. L. Jiménez, J. C. Palacios, Tetrahedron: Asymmetry 1997, 8, 2997.
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(1997)
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Babiano, R.2
Cintas, P.3
Jiménez, J.L.4
Palacios, J.C.5
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84
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66349129675
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C. Girard, H. B. Kagan, Angew. Chem. 1998, 110, 3088; Angew. Chem. Int. Ed. 1998, 37, 2922.
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C. Girard, H. B. Kagan, Angew. Chem. 1998, 110, 3088; Angew. Chem. Int. Ed. 1998, 37, 2922.
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86
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0141891472
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In our previous study of the Strecker reaction of aldimines, 1H NMR spectroscopic data suggested that the N atom of the imine probably coordinated to the silicon atom of the hypervalent silicate and ultimately formed an NèSi bond see the following ref, Z. G. Jiao, X. M. Feng, B. Liu, F. X. Chen, G. L. Zhang, Y. Z. Jiang, Eur. J. Org. Chem. 2003, 3818, According to refs, 2c, k] the product appeared to be silylated 2 in the reaction mixture and the silyl ether was hydrolyzed during the aqueous workup or direct silica gel chromatography
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1H NMR spectroscopic data suggested that the N atom of the imine probably coordinated to the silicon atom of the hypervalent silicate and ultimately formed an NèSi bond (see the following ref.: Z. G. Jiao, X. M. Feng, B. Liu, F. X. Chen, G. L. Zhang, Y. Z. Jiang, Eur. J. Org. Chem. 2003, 3818). According to refs. [2c, k] the product appeared to be silylated 2 in the reaction mixture and the silyl ether was hydrolyzed during the aqueous workup or direct silica gel chromatography.
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