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Connon, S. J. Chem. - Eur. J. 2006, 12, 5418. See also ref 1.
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Examples of reactions catalyzed by chiral thioureas include the Strecker reaction: (a) Sigman, M. S.; Jacobsen, E. N. J. Am. Chem. Soc. 1998, 120, 4901.
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Examples of reactions catalyzed by chiral thioureas include the Strecker reaction: (a) Sigman, M. S.; Jacobsen, E. N. J. Am. Chem. Soc. 1998, 120, 4901.
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5
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21244471124
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Michael addition: (b) Hoashi, Y.; Okino, T.; Takemoto, Y. Angew. Chem., Int. Ed. 2005, 44, 4032.
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Michael addition: (b) Hoashi, Y.; Okino, T.; Takemoto, Y. Angew. Chem., Int. Ed. 2005, 44, 4032.
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Morita-Baylis-Hillman reaction: Wang, J.; Li, H.; Yu, X. H.; Zu, L. S.; Wang, W. Org. Lett. 2005, 7, 4293.
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Morita-Baylis-Hillman reaction: Wang, J.; Li, H.; Yu, X. H.; Zu, L. S.; Wang, W. Org. Lett. 2005, 7, 4293.
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8
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33745672062
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Friedel-Crafts reaction: Wang, Y. Q.; Song, J.; Hong, R.; Li, H. M.; Deng, L. J. Am. Chem. Soc. 2006, 128, 8156.
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(d) Friedel-Crafts reaction: Wang, Y. Q.; Song, J.; Hong, R.; Li, H. M.; Deng, L. J. Am. Chem. Soc. 2006, 128, 8156.
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9
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34249793225
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Petasis reaction: (e) Yamaoka, Y.; Miyabe, H.; Takemoto, Y. J. Am. Chem. Soc 2007, 129, 6686.
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Petasis reaction: (e) Yamaoka, Y.; Miyabe, H.; Takemoto, Y. J. Am. Chem. Soc 2007, 129, 6686.
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10
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35948942795
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Pictet-Spengler cyclization : (f) Raheem, I. T.; Thiara, P. S.; Peterson, E. A.; Jacobsen, E. N. J. Am. Chem. Soc. 2007, 129, 13404
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Pictet-Spengler cyclization : (f) Raheem, I. T.; Thiara, P. S.; Peterson, E. A.; Jacobsen, E. N. J. Am. Chem. Soc. 2007, 129, 13404
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11
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39749116151
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Diels-Alder reaction: (g) Singh, R. P.; Bartelson, K.; Wang, Y.; Su, H.; Lu, X.; Deng, L. J. Am. Chem. Soc. 2008, 130, 2422.
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Diels-Alder reaction: (g) Singh, R. P.; Bartelson, K.; Wang, Y.; Su, H.; Lu, X.; Deng, L. J. Am. Chem. Soc. 2008, 130, 2422.
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12
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0000163641
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Other chiral H-bond donor scaffolds include, inter alia, cinchona alkaloid derivatives: (a) Hiemstra, H.; Wynberg, H. J. Am. Chem. Soc. 1981, 103, 417.
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Other chiral H-bond donor scaffolds include, inter alia, cinchona alkaloid derivatives: (a) Hiemstra, H.; Wynberg, H. J. Am. Chem. Soc. 1981, 103, 417.
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14
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Guanidinium ions: (c) Corey, E. J.; Grogan, M. J. Org. Lett. 1999, 1, 157-160.
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Guanidinium ions: (c) Corey, E. J.; Grogan, M. J. Org. Lett. 1999, 1, 157-160.
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15
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0242432417
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Diols: d
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Diols: (d) Huang, Y.; Unni, A. K.; Thadani, A. N.; Rawal, V. H. Nature 2003, 424, 146.
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Phosphoric acids : (f) Akiyama, T.; Itoh, J.; Yokota, K.; Fuchibe, K. Angew. Chem., Int. Ed. 2004, 43, 1566.
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Phosphoric acids : (f) Akiyama, T.; Itoh, J.; Yokota, K.; Fuchibe, K. Angew. Chem., Int. Ed. 2004, 43, 1566.
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19
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Amidinium ions: (h) Nugent, B. M.; Yoder, R. A.; Johnston, J. N. J. Am. Chem. Soc. 2004, 126, 3418.
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Amidinium ions: (h) Nugent, B. M.; Yoder, R. A.; Johnston, J. N. J. Am. Chem. Soc. 2004, 126, 3418.
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20
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11844302258
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Structures were optimized with Hartree-Fock calculations using the 6-31G* basis set (Spartan '04 for Macintosh, Wavefunction, Inc.). The calculated H-H distance in the thiourea approximates that found in the crystal structure of Takemoto's thiourea catalyst: Okino, T.; Hoashi, Y.; Furukawa, T.; Xu, X. N.; Takemoto, Y. J. Am. Chem. Soc. 2005, 127, 119.
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Structures were optimized with Hartree-Fock calculations using the 6-31G* basis set (Spartan '04 for Macintosh, Wavefunction, Inc.). The calculated H-H distance in the thiourea approximates that found in the crystal structure of Takemoto's thiourea catalyst: Okino, T.; Hoashi, Y.; Furukawa, T.; Xu, X. N.; Takemoto, Y. J. Am. Chem. Soc. 2005, 127, 119.
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21
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0345745617
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Squaramides have been used in molecular recognition studies: (a) Tomas, S.; Prohens, R.; Vega, M.; Rotger, M. C..; Deya, P. M.; Ballester, P.; Costa, A. J. Org. Chem. 1996, 61, 9394.
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Squaramides have been used in molecular recognition studies: (a) Tomas, S.; Prohens, R.; Vega, M.; Rotger, M. C..; Deya, P. M.; Ballester, P.; Costa, A. J. Org. Chem. 1996, 61, 9394.
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and references cited therein
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33745135836
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Squaramides have been recognized as bioisosteres of ureas: Merritt, J. R.; Rokosz, L. L.; Kingsley, H. N.; Kaiser, B.; Wang, W.; Stauffer, T. M.; Ozgur, L. E.; Schilling, A.; Li, G.; Baldwin, J. J.; Taveras, A. G.; Dwyer, M. P.; Chao, J. P Bioorg. Med. Chem. Lett. 2006, 16, 4107.
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Squaramides have been recognized as bioisosteres of ureas: Merritt, J. R.; Rokosz, L. L.; Kingsley, H. N.; Kaiser, B.; Wang, W.; Stauffer, T. M.; Ozgur, L. E.; Schilling, A.; Li, G.; Baldwin, J. J.; Taveras, A. G.; Dwyer, M. P.; Chao, J. P Bioorg. Med. Chem. Lett. 2006, 16, 4107.
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Previous reports of organocatalytic conjugate additions of 1,3-dicarbonyl compounds to nitroolefins include: (a) Li, H. M.; Wang, Y.; Tang, L.; Deng, L. J. Am. Chem. Soc. 2004, 126, 9906.
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The absolute stereochemistry of 8 was assigned by comparison of the optical rotation with the value determined in ref 9e.
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The absolute stereochemistry of 8 was assigned by comparison of the optical rotation with the value determined in ref 9e.
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