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For recent synthetic studies related to guanacastepene, see, inter alia: (a) Magnus, P.; Ollivier, C. Tetrahedron Lett. 2002, 43, 9605. (b) Shipe, W. D.; Sorensen, E. J. Org. Lett. 2002, 4, 2063 (c) Nguyen, T. M.; Seifert, R. J.; Mowrey, D. R.; Lee, D. Org. Lett. 2002, 4, 3959. (d) Nakazaki, A.; Sharma, U.; Tius, M. A. Org. Lett. 2002, 4, 3363. (e) Mehta, G.; Umarye, J. D.; Srinivas, K. Tetrahedron Lett. 2003, 44, 4233. (f) Du, X.; Chu, H. V.; Kwon, O. Org. Lett. 2003, 5, 1923. (g) Brummond K. M.; Gao, D. Org. Lett. 2003, 5, 3491. (h) Hughes, C. C.; Kennedy-Smith, J. J.; Trauner, D. Org. Lett. 2003, 5, 4113. (i) Srikrishna, A.; Dethe, D. H. Org. Lett. 2004, 6, 168. (j) Chiu, P.; Li, S. Org. Lett. 2004, 6, 613.
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For recent synthetic studies related to guanacastepene, see, inter alia: (a) Magnus, P.; Ollivier, C. Tetrahedron Lett. 2002, 43, 9605. (b) Shipe, W. D.; Sorensen, E. J. Org. Lett. 2002, 4, 2063 (c) Nguyen, T. M.; Seifert, R. J.; Mowrey, D. R.; Lee, D. Org. Lett. 2002, 4, 3959. (d) Nakazaki, A.; Sharma, U.; Tius, M. A. Org. Lett. 2002, 4, 3363. (e) Mehta, G.; Umarye, J. D.; Srinivas, K. Tetrahedron Lett. 2003, 44, 4233. (f) Du, X.; Chu, H. V.; Kwon, O. Org. Lett. 2003, 5, 1923. (g) Brummond K. M.; Gao, D. Org. Lett. 2003, 5, 3491. (h) Hughes, C. C.; Kennedy-Smith, J. J.; Trauner, D. Org. Lett. 2003, 5, 4113. (i) Srikrishna, A.; Dethe, D. H. Org. Lett. 2004, 6, 168. (j) Chiu, P.; Li, S. Org. Lett. 2004, 6, 613.
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13244295002
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note
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6 diastereomers 8 and 9 exhibit strike differences in their NMR spectra. In particular, while 9 showed sharp signals for all carbon atoms, many of its diastereomer were broad or hardly observed (see the Supporting Information).
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33
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33644528891
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Dess, D. B.; Martin, J. C. J. Org. Chem. 1983, 48, 4155. Meyer, S. D.; Schreiber, S. L. J. Org. Chem. 1994, 59, 7549.
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13244264278
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note
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While cleavage of the silyl ether in 10 with TBAF in THF was very easy (0°C, 30 min, quantitative yield), complete conversion of 11 to 13 necessitated longer time and higher temperature (17 h, rt).
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36
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13244264201
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note
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The structure of 16 were deduced from its NMR spectra in comparison with those 8 and 9 (see ref 12).
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37
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13244264357
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note
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8c: Details concerning the preparation of bicylic dienes 27 and 30 will be reported shortly.
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38
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13244294883
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note
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8c
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39
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0032501425
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For 1,2-asymmetric additions of alcohols to isoprene monoepoxide, see: Trost, B. M.; McEachern, E. J.; Toste, F. D. J. Am. Chem. Soc. 1998, 120, 12702.
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(1998)
J. Am. Chem. Soc.
, vol.120
, pp. 12702
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Trost, B.M.1
McEachern, E.J.2
Toste, F.D.3
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40
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13244299401
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note
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NMR spectra of 31 are identical to those described in ref 4c. The regio- and stereochemistry of 33 was determined as follows: oxidation of the inseparable mixture of diastereomers afforded a single enone whose structure was deduced from spectroscopic data.
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