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For recent reviews, see: (a) Donohoe, T. J.; Garg, R.; Stevenson, C. A. Tetrahedron: Asymmetry 1996, 7, 317; (b) Bach, T. Angew. Chem., Int. Ed. Engl. 1996, 35, 729; (c) Harman, W. D. Chem. Rev. 1997, 97, 1953; (d) Pape, A. R.; Kaliappan, K. P.; Kündig, E. P. Chem. Rev. 2000, 100, 2917.
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33748227680
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For recent reviews, see: (a) Donohoe, T. J.; Garg, R.; Stevenson, C. A. Tetrahedron: Asymmetry 1996, 7, 317; (b) Bach, T. Angew. Chem., Int. Ed. Engl. 1996, 35, 729; (c) Harman, W. D. Chem. Rev. 1997, 97, 1953; (d) Pape, A. R.; Kaliappan, K. P.; Kündig, E. P. Chem. Rev. 2000, 100, 2917.
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0000987672
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For recent reviews, see: (a) Donohoe, T. J.; Garg, R.; Stevenson, C. A. Tetrahedron: Asymmetry 1996, 7, 317; (b) Bach, T. Angew. Chem., Int. Ed. Engl. 1996, 35, 729; (c) Harman, W. D. Chem. Rev. 1997, 97, 1953; (d) Pape, A. R.; Kaliappan, K. P.; Kündig, E. P. Chem. Rev. 2000, 100, 2917.
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37049091233
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23
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0001322922
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For reports where π-facial selectivity is observed during the oxidative spirocyclization of phenols, see: (a) Bennett, D. J.; Dean, F. M.; Herbin, G. A.; Matkin, D. A.; Price, A. W.; Robinson, M. L. J. Chem. Soc., Perkin Trans. 1 1980, 1978; (b) Murakata, M.; Tamura, M.; Hoshino, O. J. Org. Chem. 1997, 62, 4428; (c) Wipf, P.; Kim, Y. T.; Jahn, H. Synthesis 1995, 1549; (d) Drutu, I.; Njardarson, J.; Wood, J. L. Org. Lett. 2002, 4, 493; (e) Plourde, G. L. Tetrahedron Lett. 2002, 43, 3597.
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0029610989
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For reports where π-facial selectivity is observed during the oxidative spirocyclization of phenols, see: (a) Bennett, D. J.; Dean, F. M.; Herbin, G. A.; Matkin, D. A.; Price, A. W.; Robinson, M. L. J. Chem. Soc., Perkin Trans. 1 1980, 1978; (b) Murakata, M.; Tamura, M.; Hoshino, O. J. Org. Chem. 1997, 62, 4428; (c) Wipf, P.; Kim, Y. T.; Jahn, H. Synthesis 1995, 1549; (d) Drutu, I.; Njardarson, J.; Wood, J. L. Org. Lett. 2002, 4, 493; (e) Plourde, G. L. Tetrahedron Lett. 2002, 43, 3597.
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Wipf, P.1
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0001677413
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For reports where π-facial selectivity is observed during the oxidative spirocyclization of phenols, see: (a) Bennett, D. J.; Dean, F. M.; Herbin, G. A.; Matkin, D. A.; Price, A. W.; Robinson, M. L. J. Chem. Soc., Perkin Trans. 1 1980, 1978; (b) Murakata, M.; Tamura, M.; Hoshino, O. J. Org. Chem. 1997, 62, 4428; (c) Wipf, P.; Kim, Y. T.; Jahn, H. Synthesis 1995, 1549; (d) Drutu, I.; Njardarson, J.; Wood, J. L. Org. Lett. 2002, 4, 493; (e) Plourde, G. L. Tetrahedron Lett. 2002, 43, 3597.
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Drutu, I.1
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0037029776
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For reports where π-facial selectivity is observed during the oxidative spirocyclization of phenols, see: (a) Bennett, D. J.; Dean, F. M.; Herbin, G. A.; Matkin, D. A.; Price, A. W.; Robinson, M. L. J. Chem. Soc., Perkin Trans. 1 1980, 1978; (b) Murakata, M.; Tamura, M.; Hoshino, O. J. Org. Chem. 1997, 62, 4428; (c) Wipf, P.; Kim, Y. T.; Jahn, H. Synthesis 1995, 1549; (d) Drutu, I.; Njardarson, J.; Wood, J. L. Org. Lett. 2002, 4, 493; (e) Plourde, G. L. Tetrahedron Lett. 2002, 43, 3597.
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Plourde, G.L.1
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85031223734
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The preparation of cyclization substrates 7a-l, 9a, 9b, and 12 will be reported elsewhere
-
The preparation of cyclization substrates 7a-l, 9a, 9b, and 12 will be reported elsewhere.
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-
-
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29
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85031219754
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2=0.2398 for all data. Crystallographic data (excluding structure factors) for the structure in this paper, have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication number CCDC 201039
-
2=0.2398 for all data. Crystallographic data (excluding structure factors) for the structure in this paper, have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication number CCDC 201039.
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-
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30
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85031229624
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note
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4), filtered, concentrated under reduced pressure, and the residue purified by radial chromatography on silica gel (2 mm, EtOAc/hexanes, 1:1) to provide anti-8a (35 mg, 75% yield) as white crystals.
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32
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0000691789
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Analogous rationalizations of π-facial diastereoselectivity are proposed in: (a) Wender, P. A.; Ternansky, R. J. Tetrahedron Lett. 1985, 26, 2625; (b) Adam, W.; Peters, E. M.; Peters, K.; Prein, M.; von Schnering, H. G. J. Am. Chem. Soc. 1995, 117, 6686; (c) Kamikawa, K.; Furusyo, M.; Uno, T.; Sato, Y.; Konoo, A.; Bringmann, G.; Uemura, M. Org. Lett. 2001, 3, 3667.
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Wender, P.A.1
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33
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0001400709
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Analogous rationalizations of π-facial diastereoselectivity are proposed in: (a) Wender, P. A.; Ternansky, R. J. Tetrahedron Lett. 1985, 26, 2625; (b) Adam, W.; Peters, E. M.; Peters, K.; Prein, M.; von Schnering, H. G. J. Am. Chem. Soc. 1995, 117, 6686; (c) Kamikawa, K.; Furusyo, M.; Uno, T.; Sato, Y.; Konoo, A.; Bringmann, G.; Uemura, M. Org. Lett. 2001, 3, 3667.
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Von Schnering, H.G.5
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34
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0001575410
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Analogous rationalizations of π-facial diastereoselectivity are proposed in: (a) Wender, P. A.; Ternansky, R. J. Tetrahedron Lett. 1985, 26, 2625; (b) Adam, W.; Peters, E. M.; Peters, K.; Prein, M.; von Schnering, H. G. J. Am. Chem. Soc. 1995, 117, 6686; (c) Kamikawa, K.; Furusyo, M.; Uno, T.; Sato, Y.; Konoo, A.; Bringmann, G.; Uemura, M. Org. Lett. 2001, 3, 3667.
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Kamikawa, K.1
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Sato, Y.4
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Bringmann, G.6
Uemura7
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36
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85031232642
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23 rapidly undergo Diels-Alder dimerization and consequently cannot be isolated. In our case, this pathway may be less favorable since the N-methoxyl group effectively blocks the adjoining π-system from attack
-
23 rapidly undergo Diels-Alder dimerization and consequently cannot be isolated. In our case, this pathway may be less favorable since the N-methoxyl group effectively blocks the adjoining π-system from attack.
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38
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0001683550
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For recent approaches to 1-azaspiro[5.5]undecanes, see: (a) Fenster, M. D. B.; Patrick, B. O.; Dake, G. R. Org. Lett. 2001, 3, 2109; (b) Stockmann, R. A. Tetrahedron Lett. 2000, 41, 9163; (c) Kim, D.; Shim, P. J.; Lee, J.; Park, C. W.; Hong, S. W.; Kim, S. J. Org. Chem. 2000, 65, 4864; (d) Luzzio, F. A.; Fitch, R. W. J. Org. Chem. 1999, 64, 5485; (e) Tanner, D.; Hagberg, L.; Poulsen, A. Tetrahedron 1999, 55, 1427.
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For recent approaches to 1-azaspiro[5.5]undecanes, see: (a) Fenster, M. D. B.; Patrick, B. O.; Dake, G. R. Org. Lett. 2001, 3, 2109; (b) Stockmann, R. A. Tetrahedron Lett. 2000, 41, 9163; (c) Kim, D.; Shim, P. J.; Lee, J.; Park, C. W.; Hong, S. W.; Kim, S. J. Org. Chem. 2000, 65, 4864; (d) Luzzio, F. A.; Fitch, R. W. J. Org. Chem. 1999, 64, 5485; (e) Tanner, D.; Hagberg, L.; Poulsen, A. Tetrahedron 1999, 55, 1427.
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Stockmann, R.A.1
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For recent approaches to 1-azaspiro[5.5]undecanes, see: (a) Fenster, M. D. B.; Patrick, B. O.; Dake, G. R. Org. Lett. 2001, 3, 2109; (b) Stockmann, R. A. Tetrahedron Lett. 2000, 41, 9163; (c) Kim, D.; Shim, P. J.; Lee, J.; Park, C. W.; Hong, S. W.; Kim, S. J. Org. Chem. 2000, 65, 4864; (d) Luzzio, F. A.; Fitch, R. W. J. Org. Chem. 1999, 64, 5485; (e) Tanner, D.; Hagberg, L.; Poulsen, A. Tetrahedron 1999, 55, 1427.
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For recent approaches to 1-azaspiro[5.5]undecanes, see: (a) Fenster, M. D. B.; Patrick, B. O.; Dake, G. R. Org. Lett. 2001, 3, 2109; (b) Stockmann, R. A. Tetrahedron Lett. 2000, 41, 9163; (c) Kim, D.; Shim, P. J.; Lee, J.; Park, C. W.; Hong, S. W.; Kim, S. J. Org. Chem. 2000, 65, 4864; (d) Luzzio, F. A.; Fitch, R. W. J. Org. Chem. 1999, 64, 5485; (e) Tanner, D.; Hagberg, L.; Poulsen, A. Tetrahedron 1999, 55, 1427.
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For recent approaches to 1-azaspiro[5.5]undecanes, see: (a) Fenster, M. D. B.; Patrick, B. O.; Dake, G. R. Org. Lett. 2001, 3, 2109; (b) Stockmann, R. A. Tetrahedron Lett. 2000, 41, 9163; (c) Kim, D.; Shim, P. J.; Lee, J.; Park, C. W.; Hong, S. W.; Kim, S. J. Org. Chem. 2000, 65, 4864; (d) Luzzio, F. A.; Fitch, R. W. J. Org. Chem. 1999, 64, 5485; (e) Tanner, D.; Hagberg, L.; Poulsen, A. Tetrahedron 1999, 55, 1427.
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