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Some exemples of "temporary covalent tethers" in Diels-Alder cycloadditions are available. Boron: a) Nicolaou, K.C.; Liu, J.J.; Hwang, C.K.; Dai, W.M.; Guy, R.K. J. Chem. Soc. Chem. Commun. 1992, 1118-1120;
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Hydrogen bonds have sometimes been used as putative "transient tethers". An early exemple could be found in Woodward's reserpine synthesis: f) Woodward, R.B.; Bader, F.E.; Bickel, H.; Frey, A.J.; .Kierstead, R.W; Tetrahedron 1958, 2, 1-57;
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A similar effect of regio-and stereocontrol in 1,3 dipolar cycloadditions by internal Lewis acid coordination was recently published: Kanemasa, S.; Tsuruoka, T. Chem. Lett. 1995, 49-50; Kanemasa, S.; Tsuruoka, T.; Yamamoto, H. Tetrahedron Lett. 1995, 36, 5019-5022; Kanemasa, S.; Nishiuchi, M.; Kamimura, A.; Hori, K. J. Am. Chem. Soc. 1994, 116, 2324-2339; Kanemasa, S.; Tsuruoka, T.; Wada, E. Tetrahedron Lett. 1993, 34, 87-90.
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A similar effect of regio-and stereocontrol in 1,3 dipolar cycloadditions by internal Lewis acid coordination was recently published: Kanemasa, S.; Tsuruoka, T. Chem. Lett. 1995, 49-50; Kanemasa, S.; Tsuruoka, T.; Yamamoto, H. Tetrahedron Lett. 1995, 36, 5019-5022; Kanemasa, S.; Nishiuchi, M.; Kamimura, A.; Hori, K. J. Am. Chem. Soc. 1994, 116, 2324-2339; Kanemasa, S.; Tsuruoka, T.; Wada, E. Tetrahedron Lett. 1993, 34, 87-90.
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A similar effect of regio-and stereocontrol in 1,3 dipolar cycloadditions by internal Lewis acid coordination was recently published: Kanemasa, S.; Tsuruoka, T. Chem. Lett. 1995, 49-50; Kanemasa, S.; Tsuruoka, T.; Yamamoto, H. Tetrahedron Lett. 1995, 36, 5019-5022; Kanemasa, S.; Nishiuchi, M.; Kamimura, A.; Hori, K. J. Am. Chem. Soc. 1994, 116, 2324-2339; Kanemasa, S.; Tsuruoka, T.; Wada, E. Tetrahedron Lett. 1993, 34, 87-90.
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A similar effect of regio-and stereocontrol in 1,3 dipolar cycloadditions by internal Lewis acid coordination was recently published: Kanemasa, S.; Tsuruoka, T. Chem. Lett. 1995, 49-50; Kanemasa, S.; Tsuruoka, T.; Yamamoto, H. Tetrahedron Lett. 1995, 36, 5019-5022; Kanemasa, S.; Nishiuchi, M.; Kamimura, A.; Hori, K. J. Am. Chem. Soc. 1994, 116, 2324-2339; Kanemasa, S.; Tsuruoka, T.; Wada, E. Tetrahedron Lett. 1993, 34, 87-90.
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note
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Will be published separately.
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25
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28
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37049070644
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Such tandem reaction sequences are known to give γ-substitution products: Ballester, P.; Costa, A.; Raso, A.G.; Gomez-Solivellas, A.; Mestres, R. J. Chem. Soc. Perkin Trans. I 1988, 1711-1717; Ballester, P.; Garcia-Raso, A.; Gomez-Solivellas, A.; Mestres, R. Tetrahedron Lett. 1985, 26, 2485-2488.
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Such tandem reaction sequences are known to give γ-substitution products: Ballester, P.; Costa, A.; Raso, A.G.; Gomez-Solivellas, A.; Mestres, R. J. Chem. Soc. Perkin Trans. I 1988, 1711-1717; Ballester, P.; Garcia-Raso, A.; Gomez-Solivellas, A.; Mestres, R. Tetrahedron Lett. 1985, 26, 2485-2488.
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0000033187
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and references cited therein
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Cascade Michael-Michael or "anionic" stepwise Diels-Alder cycloadditions are known: a) Ihara, M.; Makita, K.; Tokunaga, Y.; Fukumoto, K. J. Org. Chem. 1994, 59, 6008-6013 and references cited therein.
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85069408927
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note
-
For a stepwise mechanism, rapid rotation around the C5-C6 bond in the Michael addition intermediate would yield a mixture of cis/trans products, irrespective of the dienophile stereochemistry.
-
-
-
-
50
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0001368775
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Prepared from 1-trimethylsiloxy-1,3-cyclohexadiene: Clarke, C.; Fleming, I.; Fortunak, J.D.M.; Gallagher, P.T. Tetrahedron 1988, 44, 3931-3944.
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85069400253
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note
-
1-Trimethylsiloxy-1,3,5-hexatriene is a mixture of E,E,E (roughly 75%) and Z,E,E isomers. Traces of other stereoisomers are also present. A slight excess was used (1.5 equiv.).
-
-
-
-
54
-
-
85069407990
-
-
note
-
Both acidic (protic) and ketone/aldehyde-containing dienophiles did not give the cycloaddition reaction with diene 13, setting the major limitations of this methodology.
-
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55
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0025370315
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Corey, E.J.; Soo Kim, S. Tetrahedron Lett. 1990, 31, 3715-3719; Corey, E.J.; Yu, C-M.; Soo Kim, S. J. Am. Chem. Soc. 1989, 111, 5495-5496.
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