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For other synthetic studies, see: (a) Huang, H. B.; Panek, J. S. Org. Lett. 2003, 5, 1991. (b) Sneddon, H. F.; Gaunt, M. J.; Ley, S. V. Org. Lett. 2003, 5, 1147. (c) Romero-Ortega, M.; Colby, D. A.; Olivo, H. F. Tetrahedron Lett. 2002, 43, 6439. (d) Pihko, A. J.; Nicolaou, K. C.; Koskinen, A. M. P. Tetrahedron: Asymmetry 2001, 12, 937. (e) Olivo, H. F.; Velazquez, F.; Trevisan, H. C. Org. Lett. 2000, 2, 4055. (f) Velazquez, F.; Olivo, H. F. Org. Lett. 2000, 2, 1931. (g) Hoye, T. R.; Zhao, H. Org. Lett. 1999, 1, 169.
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For other synthetic studies, see: (a) Huang, H. B.; Panek, J. S. Org. Lett. 2003, 5, 1991. (b) Sneddon, H. F.; Gaunt, M. J.; Ley, S. V. Org. Lett. 2003, 5, 1147. (c) Romero-Ortega, M.; Colby, D. A.; Olivo, H. F. Tetrahedron Lett. 2002, 43, 6439. (d) Pihko, A. J.; Nicolaou, K. C.; Koskinen, A. M. P. Tetrahedron: Asymmetry 2001, 12, 937. (e) Olivo, H. F.; Velazquez, F.; Trevisan, H. C. Org. Lett. 2000, 2, 4055. (f) Velazquez, F.; Olivo, H. F. Org. Lett. 2000, 2, 1931. (g) Hoye, T. R.; Zhao, H. Org. Lett. 1999, 1, 169.
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0037009681
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For other synthetic studies, see: (a) Huang, H. B.; Panek, J. S. Org. Lett. 2003, 5, 1991. (b) Sneddon, H. F.; Gaunt, M. J.; Ley, S. V. Org. Lett. 2003, 5, 1147. (c) Romero-Ortega, M.; Colby, D. A.; Olivo, H. F. Tetrahedron Lett. 2002, 43, 6439. (d) Pihko, A. J.; Nicolaou, K. C.; Koskinen, A. M. P. Tetrahedron: Asymmetry 2001, 12, 937. (e) Olivo, H. F.; Velazquez, F.; Trevisan, H. C. Org. Lett. 2000, 2, 4055. (f) Velazquez, F.; Olivo, H. F. Org. Lett. 2000, 2, 1931. (g) Hoye, T. R.; Zhao, H. Org. Lett. 1999, 1, 169.
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Olivo, H.F.3
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For other synthetic studies, see: (a) Huang, H. B.; Panek, J. S. Org. Lett. 2003, 5, 1991. (b) Sneddon, H. F.; Gaunt, M. J.; Ley, S. V. Org. Lett. 2003, 5, 1147. (c) Romero-Ortega, M.; Colby, D. A.; Olivo, H. F. Tetrahedron Lett. 2002, 43, 6439. (d) Pihko, A. J.; Nicolaou, K. C.; Koskinen, A. M. P. Tetrahedron: Asymmetry 2001, 12, 937. (e) Olivo, H. F.; Velazquez, F.; Trevisan, H. C. Org. Lett. 2000, 2, 4055. (f) Velazquez, F.; Olivo, H. F. Org. Lett. 2000, 2, 1931. (g) Hoye, T. R.; Zhao, H. Org. Lett. 1999, 1, 169.
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Tetrahedron: Asymmetry
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Pihko, A.J.1
Nicolaou, K.C.2
Koskinen, A.M.P.3
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13
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0034649726
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For other synthetic studies, see: (a) Huang, H. B.; Panek, J. S. Org. Lett. 2003, 5, 1991. (b) Sneddon, H. F.; Gaunt, M. J.; Ley, S. V. Org. Lett. 2003, 5, 1147. (c) Romero-Ortega, M.; Colby, D. A.; Olivo, H. F. Tetrahedron Lett. 2002, 43, 6439. (d) Pihko, A. J.; Nicolaou, K. C.; Koskinen, A. M. P. Tetrahedron: Asymmetry 2001, 12, 937. (e) Olivo, H. F.; Velazquez, F.; Trevisan, H. C. Org. Lett. 2000, 2, 4055. (f) Velazquez, F.; Olivo, H. F. Org. Lett. 2000, 2, 1931. (g) Hoye, T. R.; Zhao, H. Org. Lett. 1999, 1, 169.
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Olivo, H.F.1
Velazquez, F.2
Trevisan, H.C.3
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14
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For other synthetic studies, see: (a) Huang, H. B.; Panek, J. S. Org. Lett. 2003, 5, 1991. (b) Sneddon, H. F.; Gaunt, M. J.; Ley, S. V. Org. Lett. 2003, 5, 1147. (c) Romero-Ortega, M.; Colby, D. A.; Olivo, H. F. Tetrahedron Lett. 2002, 43, 6439. (d) Pihko, A. J.; Nicolaou, K. C.; Koskinen, A. M. P. Tetrahedron: Asymmetry 2001, 12, 937. (e) Olivo, H. F.; Velazquez, F.; Trevisan, H. C. Org. Lett. 2000, 2, 4055. (f) Velazquez, F.; Olivo, H. F. Org. Lett. 2000, 2, 1931. (g) Hoye, T. R.; Zhao, H. Org. Lett. 1999, 1, 169.
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Velazquez, F.1
Olivo, H.F.2
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For other synthetic studies, see: (a) Huang, H. B.; Panek, J. S. Org. Lett. 2003, 5, 1991. (b) Sneddon, H. F.; Gaunt, M. J.; Ley, S. V. Org. Lett. 2003, 5, 1147. (c) Romero-Ortega, M.; Colby, D. A.; Olivo, H. F. Tetrahedron Lett. 2002, 43, 6439. (d) Pihko, A. J.; Nicolaou, K. C.; Koskinen, A. M. P. Tetrahedron: Asymmetry 2001, 12, 937. (e) Olivo, H. F.; Velazquez, F.; Trevisan, H. C. Org. Lett. 2000, 2, 4055. (f) Velazquez, F.; Olivo, H. F. Org. Lett. 2000, 2, 1931. (g) Hoye, T. R.; Zhao, H. Org. Lett. 1999, 1, 169.
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0344792721
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note
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Previously, aldehyde 5 was used as its racemate, which permitted the configurational flexibility at C13 required at the time (ref 4).
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19
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85069754511
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Iodide 9 was prepared in two steps from pyridinium-1-sulfonate in 35% yield; see: (a) Becher J. Synthesis 1980, 589. (b) Soullez, D.; Plé, G.; Duhamel, L. J. Chem. Soc., Perkin Trans. 1 1997, 1639.
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Becher, J.1
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20
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33748648169
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Iodide 9 was prepared in two steps from pyridinium-1-sulfonate in 35% yield; see: (a) Becher J. Synthesis 1980, 589. (b) Soullez, D.; Plé, G.; Duhamel, L. J. Chem. Soc., Perkin Trans. 1 1997, 1639.
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0033690703
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For a recent review of the vinylogous aldol reaction, see: Casiraghi, G. ; Zanardi, F.; Appendino, G.; Rassu, G. Chem. Rev. 2000, 100, 1929.
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23
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0026525675
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Absolute configuration of 10 was established using the advanced Mosher method, while the enantiomeric purity was determined by chiral HPLC analysis. Kusumi, T.; Hamada, T.; Ishitsuka, M. O.; Ohtani, I.; Kakisawa, H. J. Org. Chem. 1992, 57, 1033.
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0032563973
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0035802349
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2; (ii) MeONHMe·HCl, i-PrMgCl, THF, -20°C; (iii) EtMgCl, THF, 0°C. (a) Paterson, I.; Arnott, E. A. Tetrahedron Lett. 1998, 39, 7185. (b) Paterson, I.; Florence, G. J.; Gerlach, K.; Scott, J. P.; Sereinig, N. J. Am. Chem. Soc. 2001, 123, 9535.
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35
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0344360841
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note
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Notably, the unnatural (20R,21S)-diastereomer of callipeltoside, incorporating the antipodal chlorocyclopropane, has a distinctly different specific rotation, as reported by both Trost (ref 2a,b) and Evans (ref 3a), and as expected from our earlier findings on the aglycon (ref 4).
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36
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0345655405
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note
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Calculated from pyridinium-1-sulfonate as the precursor to iodide 9.
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