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To our knowledge, there is no enantioselective synthesis of epoxyoxindoles, although an asymmetric substrate-controlled diastereoselective epoxidation has been reported. See
-
To our knowledge, there is no enantioselective synthesis of epoxyoxindoles, although an asymmetric substrate-controlled diastereoselective epoxidation has been reported. See: Inoue, M.; Sakazaki, H.; Furukawa, H.; Hirama, M. Angew. Chem., Int. Ed. 2003, 42, 2654.
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34248328634
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There is one example of isatin epoxidation by dimethysulfonium methylide having therefore no diastereoselective issue. See: Bravo, P, Gaudiano, G, Umani-Ronchi, A. Gazz. Chim. Ital. 1970, 100, 652
-
There is one example of isatin epoxidation by dimethysulfonium methylide having therefore no diastereoselective issue. See: Bravo, P.; Gaudiano, G.; Umani-Ronchi, A. Gazz. Chim. Ital. 1970, 100, 652.
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38
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0041853893
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For recent successful diastereo- and enantioselective sulfur ylide epoxidation of ketones, see
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For recent successful diastereo- and enantioselective sulfur ylide epoxidation of ketones, see: Aggarwal, V. K.; Bae, I.; Lee, H.-Y.; Richardson, J.; Williams, D. T. Angew. Chem., Int. Ed. 2003, 42, 3274.
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33244460806
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(f) Aggarwal, V. K.; Charmant, J. P. H.; Fuentes, D.; Harvey, J. N.; Hynd, G.; Ohara, D.; Picoul, W.; Robiette, R.; Smith, C.; Vasse, J.-L.; Winn, C. L. J. Am. Chem. Soc. 2006, 128, 2105 and references therein for background knowledge.
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Arai, S.1
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34248375538
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2O (9:1).
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2O (9:1).
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52
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33344460416
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For in situ formation of sulfonium salts for ylide cyclopropanation chemistry, see: Rasmy, O. M, Vaid, R. K, Semo, M J, Chelius, E. C, Robey, R. L, Alt, C. A, Rhodes, G. A, Vivenzi, J. T. Org. Process Res. Dev. 2006, 10, 28. See ref 14 for the the sulfonium salt isolation
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For in situ formation of sulfonium salts for ylide cyclopropanation chemistry, see: Rasmy, O. M.; Vaid, R. K.; Semo, M J.; Chelius, E. C.; Robey, R. L.; Alt, C. A.; Rhodes, G. A.; Vivenzi, J. T. Org. Process Res. Dev. 2006, 10, 28. See ref 14 for the the sulfonium salt isolation.
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-
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54
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34248348607
-
-
1H NMR spectrum; however, according to the X-ray crystal structure, this is a trans-epoxide.
-
1H NMR spectrum; however, according to the X-ray crystal structure, this is a trans-epoxide.
-
-
-
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55
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33845683453
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Recently, a related explanation was proposed to account for the diastereoselective sulfonium ylide cyclopropanation of 3-methylene oxindoles. See: Yong, S. R.; Ung, A. T.; Pyne, S. G.; Skelton, B. W.; White, A. H. Tetrahedron 2007, 63, 1191.
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Recently, a related explanation was proposed to account for the diastereoselective sulfonium ylide cyclopropanation of 3-methylene oxindoles. See: Yong, S. R.; Ung, A. T.; Pyne, S. G.; Skelton, B. W.; White, A. H. Tetrahedron 2007, 63, 1191.
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-
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56
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18744373347
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The (R,R)-2,5-dimethylthiolane afforded the (+)-epoxide 4a in similar enantioselectivities. For sulfide synthesis, see: Davoust, M.; Brière, J.-F.; Jaffrès, P.-A.; Metzner, P. J. Org. Chem. 2005, 70, 4166.
-
The (R,R)-2,5-dimethylthiolane afforded the (+)-epoxide 4a in similar enantioselectivities. For sulfide synthesis, see: Davoust, M.; Brière, J.-F.; Jaffrès, P.-A.; Metzner, P. J. Org. Chem. 2005, 70, 4166.
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