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3
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1542544514
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Umebayashi, C.; Yamamoto, N.; Nakao, H.; Toi, Y.; Chikahisa-Muramatsu, L.; Kanemaru, K.; Masuda, T.; Oyama, Y. Biol. Pharm. Bull. 2003, 26, 627.
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Masuda, T.7
Oyama, Y.8
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4
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0037021092
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For examples of sterically hindered inverse-electron-demand Diels-Alder reactions, see: (a) Jung, M. E, Davidov, P. Angew. Chem, Int. Ed. 2002, 41, 4125
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For examples of sterically hindered inverse-electron-demand Diels-Alder reactions, see: (a) Jung, M. E.; Davidov, P. Angew. Chem., Int. Ed. 2002, 41, 4125.
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5
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17844382667
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(b) Jung, M. E.; Ho, D.; Chu, H. V. Org. Lett. 2005, 7, 1649.
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Jung, M.E.1
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6
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41249089313
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Recently a synthesis of a related steroid, ouabain, was reported using a Michael-aldol approach. Zhang, H.; Reddy, M. S.; Phoenix, S.; Deslongchamps, P. Angew. Chem., Int. Ed. 2008, 47, 1272.
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Recently a synthesis of a related steroid, ouabain, was reported using a Michael-aldol approach. Zhang, H.; Reddy, M. S.; Phoenix, S.; Deslongchamps, P. Angew. Chem., Int. Ed. 2008, 47, 1272.
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-
-
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8
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0019125839
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Compound 7a was prepared by the modified procedure of Vollhardt, namely the copper-catalyzed 1,4-addition of vinyllithium in the presence of TESCl and HMPA. Funk, R. L.; Vollhardt, K. P. C. J. Am. Chem. Soc. 1980, 102, 5253.
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Compound 7a was prepared by the modified procedure of Vollhardt, namely the copper-catalyzed 1,4-addition of vinyllithium in the presence of TESCl and HMPA. Funk, R. L.; Vollhardt, K. P. C. J. Am. Chem. Soc. 1980, 102, 5253.
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10
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61349181656
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For example, oxidation with m-CPBA, trifluoroperacetic acid, hydrogen peroxide, and bis(trimethylsilyl) peroxide in the presence of trimethylsilyl triflate gave only starting material.
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For example, oxidation with m-CPBA, trifluoroperacetic acid, hydrogen peroxide, and bis(trimethylsilyl) peroxide in the presence of trimethylsilyl triflate gave only starting material.
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11
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0023784571
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(a) Nemoto, H.; Nagai, M.; Moizumi, M.; Kohzuki, K.; Fukumoto, K.; Kametani, T. Tetrahedron Lett. 1988, 29, 4959.
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12
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37049090182
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0002292348
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For reviews of annulation, see: a
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For reviews of annulation, see: (a) Jung, M. E. Tetrahedron 1976, 32, 3.
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Van Royen, L. A.; Mijngheer, R.; De Clercq, P. J. Tetrahedron Lett. 1983, 24, 3145. See also refs 10b, c and 11b.
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Van Royen, L. A.; Mijngheer, R.; De Clercq, P. J. Tetrahedron Lett. 1983, 24, 3145. See also refs 10b, c and 11b.
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(b) Stork, G.; Jung, M. E.; Colvin, E.; Noel, Y. J. Am. Chem. Soc. 1974, 96, 3684.
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27
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61349190796
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We thank Dr. Saeed Khan for the X-ray structural analysis
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We thank Dr. Saeed Khan for the X-ray structural analysis.
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