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Snider, B.B.1
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15844411797
-
-
note
-
Alanine butyl ester 6a was used instead of the corresponding methyl ester for synthetic convenience, because the latter is both volatile and water soluble.
-
-
-
-
49
-
-
15844399264
-
-
note
-
The authors have deposited atomic coordinates for these structures with the Cambridge Crystallographic Data Centre. The coordinates can be obtained on request from the Director, Cambridge Crystaltographic Data Centre, 12 Union Road, Cambridge, CB2 1EZ, UK.
-
-
-
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50
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3342945460
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Ab initio calculations by Wiberg and Murcko on 1,2-dihalo-ethanes and 1,2-haloethanols showed that the gauche conformation of X-C-C-Y systems is about 1-2 kcal/mol more stable than the antiperiplanar conformation. A similar preference for the gauche orientation of the C-C-C-O and C-C-O-C fragment contributes to the anomeric effect in 2-methoxytetrahydropyran and related systems. (a) Wiberg, K. B.; Murcko, M. A. J. Mol Struct. 1988, 163, 1. (b) Wiberg, K. B.; Murcko, M. A. J Phys. Chem. 1987, 91, 3616. (c) Wiberg, K. B.; Murcko, M. A. J. Am. Chem. Soc. 1989, 111, 4821. For a general discussion of stereoelectronic effects and the anomeric effect see: (d) Deslongchamps, P. Stereoelectronic Effects in Organic Chemistry; Pergamon Press: Oxford, 1983; p 302. (e) Graczyk, P. P.; Mikolajczyk, M. Top. Stereochem. 1994, 21, 159.
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1542752101
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Ab initio calculations by Wiberg and Murcko on 1,2-dihalo-ethanes and 1,2-haloethanols showed that the gauche conformation of X-C-C-Y systems is about 1-2 kcal/mol more stable than the antiperiplanar conformation. A similar preference for the gauche orientation of the C-C-C-O and C-C-O-C fragment contributes to the anomeric effect in 2-methoxytetrahydropyran and related systems. (a) Wiberg, K. B.; Murcko, M. A. J. Mol Struct. 1988, 163, 1. (b) Wiberg, K. B.; Murcko, M. A. J Phys. Chem. 1987, 91, 3616. (c) Wiberg, K. B.; Murcko, M. A. J. Am. Chem. Soc. 1989, 111, 4821. For a general discussion of stereoelectronic effects and the anomeric effect see: (d) Deslongchamps, P. Stereoelectronic Effects in Organic Chemistry; Pergamon Press: Oxford, 1983; p 302. (e) Graczyk, P. P.; Mikolajczyk, M. Top. Stereochem. 1994, 21, 159.
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33845184761
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Ab initio calculations by Wiberg and Murcko on 1,2-dihalo-ethanes and 1,2-haloethanols showed that the gauche conformation of X-C-C-Y systems is about 1-2 kcal/mol more stable than the antiperiplanar conformation. A similar preference for the gauche orientation of the C-C-C-O and C-C-O-C fragment contributes to the anomeric effect in 2-methoxytetrahydropyran and related systems. (a) Wiberg, K. B.; Murcko, M. A. J. Mol Struct. 1988, 163, 1. (b) Wiberg, K. B.; Murcko, M. A. J Phys. Chem. 1987, 91, 3616. (c) Wiberg, K. B.; Murcko, M. A. J. Am. Chem. Soc. 1989, 111, 4821. For a general discussion of stereoelectronic effects and the anomeric effect see: (d) Deslongchamps, P. Stereoelectronic Effects in Organic Chemistry; Pergamon Press: Oxford, 1983; p 302. (e) Graczyk, P. P.; Mikolajczyk, M. Top. Stereochem. 1994, 21, 159.
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Ab initio calculations by Wiberg and Murcko on 1,2-dihalo-ethanes and 1,2-haloethanols showed that the gauche conformation of X-C-C-Y systems is about 1-2 kcal/mol more stable than the antiperiplanar conformation. A similar preference for the gauche orientation of the C-C-C-O and C-C-O-C fragment contributes to the anomeric effect in 2-methoxytetrahydropyran and related systems. (a) Wiberg, K. B.; Murcko, M. A. J. Mol Struct. 1988, 163, 1. (b) Wiberg, K. B.; Murcko, M. A. J Phys. Chem. 1987, 91, 3616. (c) Wiberg, K. B.; Murcko, M. A. J. Am. Chem. Soc. 1989, 111, 4821. For a general discussion of stereoelectronic effects and the anomeric effect see: (d) Deslongchamps, P. Stereoelectronic Effects in Organic Chemistry; Pergamon Press: Oxford, 1983; p 302. (e) Graczyk, P. P.; Mikolajczyk, M. Top. Stereochem. 1994, 21, 159.
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54
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0003258093
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Ab initio calculations by Wiberg and Murcko on 1,2-dihalo-ethanes and 1,2-haloethanols showed that the gauche conformation of X-C-C-Y systems is about 1-2 kcal/mol more stable than the antiperiplanar conformation. A similar preference for the gauche orientation of the C-C-C-O and C-C-O-C fragment contributes to the anomeric effect in 2-methoxytetrahydropyran and related systems. (a) Wiberg, K. B.; Murcko, M. A. J. Mol Struct. 1988, 163, 1. (b) Wiberg, K. B.; Murcko, M. A. J Phys. Chem. 1987, 91, 3616. (c) Wiberg, K. B.; Murcko, M. A. J. Am. Chem. Soc. 1989, 111, 4821. For a general discussion of stereoelectronic effects and the anomeric effect see: (d) Deslongchamps, P. Stereoelectronic Effects in Organic Chemistry; Pergamon Press: Oxford, 1983; p 302. (e) Graczyk, P. P.; Mikolajczyk, M. Top. Stereochem. 1994, 21, 159.
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2142642852
-
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4 97.4/2.6) was observed as the only product. No traces of the corresponding N-benzylidene-3,3-dimethyl-6-isopropylcyclohexylamine could be detected. See also: (a) Demailly, G.; Solladie, G. Tetrahedron Lett 1977,18, 1885. (b) Demailly, G.; Solladie, G. J. Org. Chem. 1981, 46, 3102.
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33845556342
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4 97.4/2.6) was observed as the only product. No traces of the corresponding N-benzylidene-3,3-dimethyl-6-isopropylcyclohexylamine could be detected. See also: (a) Demailly, G.; Solladie, G. Tetrahedron Lett 1977,18, 1885. (b) Demailly, G.; Solladie, G. J. Org. Chem. 1981, 46, 3102.
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15844376978
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note
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3.
-
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60
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0000346930
-
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N-Tosyl groups might be cleaved with sodium or lithium in liquid ammonia or with sodium naphthalenide: (a) Yamazaki, N.; Kibayashi, C. J. Am. Chem. Soc. 1989, 111, 1396. (b) Schultz, A. G.; Mc Closkey, P. J.; Court, J. J. J. Am. Chem. Soc. 1987, 109, 6493. (c) Ji. S.; Gortler, L. B.; Waring, A.; Battisti, A.; Bank, S.; Closson, W. D.; Wriede, P. J. Am. Chem. Soc. 1967, 89, 5311.
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0023555680
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N-Tosyl groups might be cleaved with sodium or lithium in liquid ammonia or with sodium naphthalenide: (a) Yamazaki, N.; Kibayashi, C. J. Am. Chem. Soc. 1989, 111, 1396. (b) Schultz, A. G.; Mc Closkey, P. J.; Court, J. J. J. Am. Chem. Soc. 1987, 109, 6493. (c) Ji. S.; Gortler, L. B.; Waring, A.; Battisti, A.; Bank, S.; Closson, W. D.; Wriede, P. J. Am. Chem. Soc. 1967, 89, 5311.
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33947338238
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N-Tosyl groups might be cleaved with sodium or lithium in liquid ammonia or with sodium naphthalenide: (a) Yamazaki, N.; Kibayashi, C. J. Am. Chem. Soc. 1989, 111, 1396. (b) Schultz, A. G.; Mc Closkey, P. J.; Court, J. J. J. Am. Chem. Soc. 1987, 109, 6493. (c) Ji. S.; Gortler, L. B.; Waring, A.; Battisti, A.; Bank, S.; Closson, W. D.; Wriede, P. J. Am. Chem. Soc. 1967, 89, 5311.
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Ji, S.1
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Wriede, P.7
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0003405157
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For a detailed discussion concerning removal of N-tosyl and N-benzyl groups see: Kocienski, P. J. Protecting Groups, Thieme Verlag: Stuttgart. 1994; p 212.
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15844369317
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-
note
-
Unexpectedly, almost complete racemization of the N-tosyl-protected aldehydes 12a,c occurred during Swern oxidation. This was determined by NMR as described in ref 29.
-
-
-
-
66
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33847088636
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1 NMR (200 MHz) using 1 mol equiv of (-)-(R)-1-(9-anthryl)-2,2,2-trifluoroethanol as shift reagent: Pirkle, W. H., Sikkenga, D. L.; Pavlin, M. S. J. Org. Chem. 1977, 42, 384.
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