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(a) Evans, D. A.; Murry, J. A.; Kozlowski, M. C. J. Am. Chem. Soc. 1996, 118, 5814-5815.
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For Sn(II)-box complexes as aldol catalysts see: (e) Evans, D. A.; MacMillan, D. W. C.; Campos, K. R. J. Am. Chem. Soc. 1997, 119, 10859-10860.
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(a) Evans, D. A.; Willis, M. C.; Johnston, J. N. Org. Lett. 1999, 1, 865-868.
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(b) Evans, D. A.; Rovis, T.; Kozlowski, M. C.; Tedrow, J. S. J. Am. Chem. Soc. 1999, 121, 1994-1995.
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For two recent reviews on various aspects of chiral Cu(2+) Lewis acid-catalyzed processes see: (a) Evans, D. A.; Rovis, T.; Johnson, J. S. Pure Appl. Chem, 1999, 71, 1407-1415. (b) Johnson, J. S.; Evans, D. A. Acc. Chem. Res. 2000, 33, 325-335.
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Evans, D.A.1
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0033936085
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For two recent reviews on various aspects of chiral Cu(2+) Lewis acid-catalyzed processes see: (a) Evans, D. A.; Rovis, T.; Johnson, J. S. Pure Appl. Chem, 1999, 71, 1407-1415. (b) Johnson, J. S.; Evans, D. A. Acc. Chem. Res. 2000, 33, 325-335.
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During the course of this research two examples of Cu(II)-box catalyzed glyoxylate - ene reactions have appeared: (d) Gao, Y.; Lane-Bell, P.; Vederas, J. C. J. Org. Chem. 1998, 63, 2133-2143.
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A preliminary account of this work has appeared: Evans, D. A.; Burgey, C. S.; Paras, N. A.; Vojkovsky, T.; Tregay; S. W. J. Am. Chem. Soc. 1998, 120, 5824-5825.
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0000070865
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2O-Cu-N-C dihedral angles are 30.0° and 36.0°. See: Evans, D. A.; Peterson, G. S.; Johnson, J. S.; Barnes, D. M.; Campos, K. C.; Woerpel, K. A. J. Org. Chem. 1998, 63, 4541-4544.
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35
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37049093745
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For chiral auxiliary based examples see: Whitesell, J. K.; Bhattacharya, A.; Aguilar, D. A.; Henke, K. J. Chem. Soc., Chem. Commun. 1982, 989-899.
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36
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0342950047
-
-
note
-
A slower reaction and a reduced yield is observed when 4 is employed.
-
-
-
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37
-
-
0342950046
-
-
note
-
Due to the volatility of cis-butene, the reactions were performed in sealed tubes using glyoxylate as limiting reagent (see Supporting Information).
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38
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0001025010
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Barlett, P. A.; Tanzella, D. J.; Barstow, J. F. J. Org. Chem. 1982, 47, 3941.
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0342950045
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note
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Fluka 50% glyoxylate in toluene solution.
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42
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27844466269
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Nahm, S.; Weinreb, S. M. Tetrahedron Lett. 1981, 22, 3815. For a review see: Sibi, M. P. Org. Prep. Proc. Int. 1993, 25, 15-40.
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Nahm, S.; Weinreb, S. M. Tetrahedron Lett. 1981, 22, 3815. For a review see: Sibi, M. P. Org. Prep. Proc. Int. 1993, 25, 15-40.
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Whitesell, J. K.; Deyo, D.; Bhattacharya, A. J. Chem. Soc., Chem. Commun. 1983, 802. For a correction see: Whitesell, J. K.; Nabona, K.; Deyo, D. J. Org. Chem. 1989, 54, 2258. Reaction between N-glyoxyloyl- (2R)-borane-10,2-sultam and monosubstituted olefins has also been reported: Jezewski, A.; Chajewska, K.; Wielogórski, Z.; Jurczak, J. Tetrahedron: Asymmetry 1997, 8, 1741-1749.
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Whitesell, J. K.; Deyo, D.; Bhattacharya, A. J. Chem. Soc., Chem. Commun. 1983, 802. For a correction see: Whitesell, J. K.; Nabona, K.; Deyo, D. J. Org. Chem. 1989, 54, 2258. Reaction between N-glyoxyloyl-(2R)-borane-10,2-sultam and monosubstituted olefins has also been reported: Jezewski, A.; Chajewska, K.; Wielogórski, Z.; Jurczak, J. Tetrahedron: Asymmetry 1997, 8, 1741-1749.
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52
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0343821137
-
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note
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Due to the volatility of isobutylene, the reactions were performed in sealed tubes (see Supporting Information).
-
-
-
-
53
-
-
0033541094
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Reference 13
-
X-ray crystallography: (a) Reference 13. (b) Evans, D. A.; Rovis, T.; Kozlowski, M. C.; Tedrow, J. T. J. Am. Chem. Soc. 1999, 121, 1994. Double stereodifferentiating experiments: (c) Evans, D. A.; Miller, S. J.; Lectka, T. J. Am. Chem. Soc. 1993, 115, 6460. PM3 and EPR experiments: (d) Reference 8b,d.
-
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54
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0033541094
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X-ray crystallography: (a) Reference 13. (b) Evans, D. A.; Rovis, T.; Kozlowski, M. C.; Tedrow, J. T. J. Am. Chem. Soc. 1999, 121, 1994. Double stereodifferentiating experiments: (c) Evans, D. A.; Miller, S. J.; Lectka, T. J. Am. Chem. Soc. 1993, 115, 6460. PM3 and EPR experiments: (d) Reference 8b,d.
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0342740235
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X-ray crystallography: (a) Reference 13. (b) Evans, D. A.; Rovis, T.; Kozlowski, M. C.; Tedrow, J. T. J. Am. Chem. Soc. 1999, 121, 1994. Double stereodifferentiating experiments: (c) Evans, D. A.; Miller, S. J.; Lectka, T. J. Am. Chem. Soc. 1993, 115, 6460. PM3 and EPR experiments: (d) Reference 8b,d.
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Reference 8b,d
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X-ray crystallography: (a) Reference 13. (b) Evans, D. A.; Rovis, T.; Kozlowski, M. C.; Tedrow, J. T. J. Am. Chem. Soc. 1999, 121, 1994. Double stereodifferentiating experiments: (c) Evans, D. A.; Miller, S. J.; Lectka, T. J. Am. Chem. Soc. 1993, 115, 6460. PM3 and EPR experiments: (d) Reference 8b,d.
-
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57
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0001290261
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Trost, B. M., Fleming, I., Eds.; Pergamon Press: Oxford
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Snider, B. In Comprehensive Organic Synthesis; Trost, B. M., Fleming, I., Eds.; Pergamon Press: Oxford, 1991; Vol 2, pp 527-561.
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(a) Evans, D. A.; Johnson, J. S.; Burgey, C. S.; Campos, K. R. Tetrahedron Lett. 1999, 40, 2879-2882.
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0343385476
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Reference 7h
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(b) Reference 7h.
-
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63
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0342950041
-
-
note
-
General Information is provided in the Supporting Information. The following are also contained in the Supporting Information: specific reaction conditions, characterization data, and absolute and relative stereochemical proofs.
-
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64
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0343385475
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ref 14
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(a) For the preparation of (S,S)-bis(tert-butyloxazoline) see: ref 14.
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85022460851
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(b) For the preparation of (S,S)-bis(phenyloxazoline) see: Corey, E. J.; Imai, N.; Zhang, H.-Y. J. Am. Chem. Soc. 1991, 113, 728-9.
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ref 27
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For the preparation of the Cu(II) complexes see: (c) ref 27 and (d) ref 14.
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67
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0342515851
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ref 14
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For the preparation of the Cu(II) complexes see: (c) ref 27 and (d) ref 14.
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