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Unmodified calix[4]arenes are conformationally mobile macrocycles which adopt a cone conformation because of strong hydrogen bonds among the hydroxy groups. The n-propylation of these groups inhibits the oxygen-through-the-annulus rotation and allows the isolation of the blocked cone conformational isomer (see: (a) Araki, K.; Iwamoto, K.; Shinkai, S.; Matsuda, T. Chem. Lett. 1989, 1747. (b) Iwamoto, K.; Araki, K.; Shinkai, S. J. Org. Chem. 1991, 56, 4955).
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Unmodified calix[4]arenes are conformationally mobile macrocycles which adopt a cone conformation because of strong hydrogen bonds among the hydroxy groups. The n-propylation of these groups inhibits the oxygen-through-the-annulus rotation and allows the isolation of the blocked cone conformational isomer (see: (a) Araki, K.; Iwamoto, K.; Shinkai, S.; Matsuda, T. Chem. Lett. 1989, 1747. (b) Iwamoto, K.; Araki, K.; Shinkai, S. J. Org. Chem. 1991, 56, 4955).
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Besides the crown ether moieties, also porphyrin (Nagasaki, T.; Fujishima, H.; Shinkai, S. Chem. Lett. 1994, 989) and β-cyclodextrin (D' Alessandro, F.; Gulino, F. G.; Impellizzeri, G.; Pappalardo, G.; Rizzarelli, E.; Sciotto, D.; Vecchio, G. Tetrahedron Lett. 1994, 35, 629. van Dienst, E.; Snellink, B. H. M.; von Piekartz, I.; Engbersen, J. F. J.; Reinhoudt, D. N. J. Chem. Soc., Chem. Commun. 1995, 1151) have been covalently linked to calix[4]arenes.
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Besides the crown ether moieties, also porphyrin (Nagasaki, T.; Fujishima, H.; Shinkai, S. Chem. Lett. 1994, 989) and β-cyclodextrin (D' Alessandro, F.; Gulino, F. G.; Impellizzeri, G.; Pappalardo, G.; Rizzarelli, E.; Sciotto, D.; Vecchio, G. Tetrahedron Lett. 1994, 35, 629. van Dienst, E.; Snellink, B. H. M.; von Piekartz, I.; Engbersen, J. F. J.; Reinhoudt, D. N. J. Chem. Soc., Chem. Commun. 1995, 1151) have been covalently linked to calix[4]arenes.
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D' Alessandro, F.1
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Vecchio, G.7
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37049070725
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Besides the crown ether moieties, also porphyrin (Nagasaki, T.; Fujishima, H.; Shinkai, S. Chem. Lett. 1994, 989) and β-cyclodextrin (D' Alessandro, F.; Gulino, F. G.; Impellizzeri, G.; Pappalardo, G.; Rizzarelli, E.; Sciotto, D.; Vecchio, G. Tetrahedron Lett. 1994, 35, 629. van Dienst, E.; Snellink, B. H. M.; von Piekartz, I.; Engbersen, J. F. J.; Reinhoudt, D. N. J. Chem. Soc., Chem. Commun. 1995, 1151) have been covalently linked to calix[4]arenes.
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Reinhoudt, D.N.5
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and references cited therein
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This feature favors the use of thiazole instead of furan since the cleavage of the furan ring to carboxyl group requires strong oxidative conditions which are not tolerated by the above protective groups (Dondoni, A.; Marra, A.; Scherrmann, M.-C. Tetrahedron Lett. 1993, 34, 7323 and references cited therein). However, due to the electron-donor character of the furan ring, the glycosylation reaction should be favored by the presence of this heterocycle at the anomeric position (see: (a) Danishefsky, S. J.; Pearson, W. H.; Segmuller, B. E. J. Am. Chem. Soc. 1985, 107, 1280. (b) Danishefsky, S. J.; DeNinno, M. P.; Chen, S. J. Am. Chem. Soc. 1988, 110, 3929).
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This feature favors the use of thiazole instead of furan since the cleavage of the furan ring to carboxyl group requires strong oxidative conditions which are not tolerated by the above protective groups (Dondoni, A.; Marra, A.; Scherrmann, M.-C. Tetrahedron Lett. 1993, 34, 7323 and references cited therein). However, due to the electron-donor character of the furan ring, the glycosylation reaction should be favored by the presence of this heterocycle at the anomeric position (see: (a) Danishefsky, S. J.; Pearson, W. H.; Segmuller, B. E. J. Am. Chem. Soc. 1985, 107, 1280. (b) Danishefsky, S. J.; DeNinno, M. P.; Chen, S. J. Am. Chem. Soc. 1988, 110, 3929).
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20
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0023889181
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This feature favors the use of thiazole instead of furan since the cleavage of the furan ring to carboxyl group requires strong oxidative conditions which are not tolerated by the above protective groups (Dondoni, A.; Marra, A.; Scherrmann, M.-C. Tetrahedron Lett. 1993, 34, 7323 and references cited therein). However, due to the electron-donor character of the furan ring, the glycosylation reaction should be favored by the presence of this heterocycle at the anomeric position (see: (a) Danishefsky, S. J.; Pearson, W. H.; Segmuller, B. E. J. Am. Chem. Soc. 1985, 107, 1280. (b) Danishefsky, S. J.; DeNinno, M. P.; Chen, S. J. Am. Chem. Soc. 1988, 110, 3929).
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2). For recent articles, see: (a) Lönn, H.; Stenvall, K. Tetrahedron Lett. 1992, 33, 115. (b) Müller, T.; Schneider, R.; Schmidt, R. R. Tetrahedron Lett. 1994, 35, 4763. (c) Kondo, H.; Aoki, S.; Ichikawa, Y.; Halcomb, R. L.; Ritzen, H.; Wong, C.-H. J. Org. Chem. 1994, 59, 864. (d) Heskamp, B. M.; Veeneman, G. H.; van der Marel, G. A.; van Boeckel, C. A. A.; van Boom, J. H. Tetrahedron 1995, 51, 5657.
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2). For recent articles, see: (a) Lönn, H.; Stenvall, K. Tetrahedron Lett. 1992, 33, 115. (b) Müller, T.; Schneider, R.; Schmidt, R. R. Tetrahedron Lett. 1994, 35, 4763. (c) Kondo, H.; Aoki, S.; Ichikawa, Y.; Halcomb, R. L.; Ritzen, H.; Wong, C.-H. J. Org. Chem. 1994, 59, 864. (d) Heskamp, B. M.; Veeneman, G. H.; van der Marel, G. A.; van Boeckel, C. A. A.; van Boom, J. H. Tetrahedron 1995, 51, 5657.
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2). For recent articles, see: (a) Lönn, H.; Stenvall, K. Tetrahedron Lett. 1992, 33, 115. (b) Müller, T.; Schneider, R.; Schmidt, R. R. Tetrahedron Lett. 1994, 35, 4763. (c) Kondo, H.; Aoki, S.; Ichikawa, Y.; Halcomb, R. L.; Ritzen, H.; Wong, C.-H. J. Org. Chem. 1994, 59, 864. (d) Heskamp, B. M.; Veeneman, G. H.; van der Marel, G. A.; van Boeckel, C. A. A.; van Boom, J. H. Tetrahedron 1995, 51, 5657.
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Wong, C.-H.6
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24
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0028938154
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2). For recent articles, see: (a) Lönn, H.; Stenvall, K. Tetrahedron Lett. 1992, 33, 115. (b) Müller, T.; Schneider, R.; Schmidt, R. R. Tetrahedron Lett. 1994, 35, 4763. (c) Kondo, H.; Aoki, S.; Ichikawa, Y.; Halcomb, R. L.; Ritzen, H.; Wong, C.-H. J. Org. Chem. 1994, 59, 864. (d) Heskamp, B. M.; Veeneman, G. H.; van der Marel, G. A.; van Boeckel, C. A. A.; van Boom, J. H. Tetrahedron 1995, 51, 5657.
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0002271243
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Reinhoudt, D.N.7
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27
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15844408900
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-
note
-
Also isolated was unreacted thiazolyl ketol acetate 1 in 32% yield.
-
-
-
-
28
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15844407719
-
-
note
-
Calix[4]arenes having a cone conformation display the signals for the equatorial and axial protons of the methylene bridges as well resolved doublets at δ ∼3 and δ ∼4, respectively (see ref 1a, pp 108-111).
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35
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15844382174
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note
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C-1,H-3 ≈ 4.0 Hz).
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37
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0002714675
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38
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0000913945
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The issue regarding these discrepancies in elemental analyses has been addressed by authoritative researchers in calixarene chemistry. See: (a) Böhmer, V.; Jung, K.; Schön, M.; Wolff, A. J. Org. Chem. 1992, 57, 790. (b) Gutsche, C. D.; See, K. A. J. Org. Chem. 1982, 57, 4527.
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Böhmer, V.1
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39
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0000913945
-
-
The issue regarding these discrepancies in elemental analyses has been addressed by authoritative researchers in calixarene chemistry. See: (a) Böhmer, V.; Jung, K.; Schön, M.; Wolff, A. J. Org. Chem. 1992, 57, 790. (b) Gutsche, C. D.; See, K. A. J. Org. Chem. 1982, 57, 4527.
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Gutsche, C.D.1
See, K.A.2
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