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1
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77749241552
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-
For an excellent review, see: (a) Snider, B. B. In Comprehensive Organic Synthesis; Trost. B. M., Fleming. I., Heathcock, C. H., Eds.; Pergamon Press: New York. 1991: 2, pp 527-561. See also:
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For an excellent review, see: (a) Snider, B. B. In Comprehensive Organic Synthesis; Trost. B. M., Fleming. I., Heathcock, C. H., Eds.; Pergamon Press: New York. 1991: Vol. 2, pp 527-561. See also:
-
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4
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0040744387
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This classification was introduced by Oppolzer and Snieckus; see: (a) Oppolzer, W, Snieckus, V. Angew. Chem, Int. Ed. Engl. 1978, 17, 476. More recently, Mikami has proposed an alternative nomenclature; see
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This classification was introduced by Oppolzer and Snieckus; see: (a) Oppolzer, W.; Snieckus, V. Angew. Chem., Int. Ed. Engl. 1978, 17, 476. More recently, Mikami has proposed an alternative nomenclature; see:
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7
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66449116154
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For THP formation, see, e.g.: (a) Zhou, H.; Loh, T.-P. Tetrahedron Lett. 2009, 50, 4368.
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For THP formation, see, e.g.: (a) Zhou, H.; Loh, T.-P. Tetrahedron Lett. 2009, 50, 4368.
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9
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77749257066
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For THF formation, see, e.g.: (a) Ünaldi, S.; Özlügedik, M.; Fröhlich, R.; Hoppe, D. Adv. Synth. Catal. 2005, 347, 162.
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For THF formation, see, e.g.: (a) Ünaldi, S.; Özlügedik, M.; Fröhlich, R.; Hoppe, D. Adv. Synth. Catal. 2005, 347, 162.
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(f) Takano, S.; Samizu, K.; Ogasawara, K. J. Chem. Soc., Chem. Commun. 1993, 1032.
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Takano, S.1
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0141678121
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See, e.g, a
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See, e.g.: (a) Overman, L. E.; Pennington, L. D. J. Org. Chem. 2003, 68, 7143.
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Overman, L.E.1
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0034719252
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Hanaki, N.; Link, J. T.; MacMillan, D. W. C.; Overman, L. E.; Trankle, W. G.; Wurster, J. A. Org. Lett. 2000, 2, 223. Note: These oxonium-Prins reactions give ring closure to a THP cation (cf. A, Scheme 1) which undergoes pinacol rearrangement to a THF final product.
-
(b) Hanaki, N.; Link, J. T.; MacMillan, D. W. C.; Overman, L. E.; Trankle, W. G.; Wurster, J. A. Org. Lett. 2000, 2, 223. Note: These oxonium-Prins reactions give ring closure to a THP cation (cf. A, Scheme 1) which undergoes pinacol rearrangement to a THF final product.
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35
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(a) Miles, S. M.; Marsden, S. P.; Leatherbarrow, R. J.; Coates, W. J. J. Org. Chem. 2004, 69, 6874.
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Miles, S.M.1
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9144265046
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(b) Miles, S. M.; Marsden, S. P.; Leatherbarrow, R. J.; Coates, W. J. Chem. Commun. 2004, 2292.
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Miles, S.M.1
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Coates, W.4
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39
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77749278802
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Racemisation via various mechanisms can plague oxonium-Prins reactions involving homoallyic alcohols; see ref 5a and references cited therein
-
Racemisation via various mechanisms can plague oxonium-Prins reactions involving homoallyic alcohols; see ref 5a and references cited therein.
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40
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0032567221
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Charette, A. B.; Juteau, H.; Lebel, H.; Molinaro, C. J. Am. Chem. Soc. 1998, 120, 11943.
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Charette, A.B.1
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Lebel, H.3
Molinaro, C.4
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41
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77749241550
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-
TMSBr appears to serve as a bromide source (cf. ref 3e). Trace product formation occurred using only TMSBr as promoter.
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TMSBr appears to serve as a bromide source (cf. ref 3e). Trace product formation occurred using only TMSBr as promoter.
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-
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42
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77749257065
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The isomeric ratios were unchanged after resubjection to the reaction conditions (Table 2, entry 7), suggesting the products are formed under kinetic control.
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The isomeric ratios were unchanged after resubjection to the reaction conditions (Table 2, entry 7), suggesting the products are formed under kinetic control.
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-
-
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43
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77749241548
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4, cf. Khurana, J. M.; Kumar, S.; Nand, B. Can. J. Chem. 2008, 86, 1052). The results were consistent with the assignments made by NOESY. For example, di-debromination of 5a and 5c gave the same products as mono-debromination of 4a/b and 4c, respectively (compounds 12 and 11, see the Supporting Information).
-
4, cf. Khurana, J. M.; Kumar, S.; Nand, B. Can. J. Chem. 2008, 86, 1052). The results were consistent with the assignments made by NOESY. For example, di-debromination of 5a and 5c gave the same products as mono-debromination of 4a/b and 4c, respectively (compounds 12 and 11, see the Supporting Information).
-
-
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44
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77749278801
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That these TSs are likely to be close in energy is consistent with our calculations on the formation of compound 10; see ref 21
-
That these TSs are likely to be close in energy is consistent with our calculations on the formation of compound 10; see ref 21.
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45
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17844408289
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See, e.g
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See, e.g.: Craig, D.; Meadows, J. D.; Pécheux, M. Tetrahedron Lett. 1998, 59, 141.
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46
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0023809027
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For the isolation and characterization of cordigol, see
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For the isolation and characterization of cordigol, see: Marston, A.; Zagorski, M. G.; Hostettmann, K. Helv. Chim. Acta 1988, 71, 1210.
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44349096144
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The same core ring system is also found in the Lophira lanceolata natural product lophirone H; see: Tih, R. G.; Sondengam, B. L.; Martin, M. T.; Bodo, B. Phytochemistry 1990, 29, 2289.
-
The same core ring system is also found in the Lophira lanceolata natural product lophirone H; see: Tih, R. G.; Sondengam, B. L.; Martin, M. T.; Bodo, B. Phytochemistry 1990, 29, 2289.
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48
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77749278803
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4 led to the formation of a mixture of compound 10 (40% yield) and a product tentatively assigned as that of intermolecular trapping by bromide (19% yield). This result is consistent with an oxonium-Prins pathway.
-
4 led to the formation of a mixture of compound 10 (40% yield) and a product tentatively assigned as that of intermolecular trapping by bromide (19% yield). This result is consistent with an oxonium-Prins pathway.
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-
-
-
49
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0033601175
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Related transformations have been used to form pyrano[2,3-c]benzopyrans; see: See: a
-
See: (a) Miyazaki, H.; Honda, K.; Asami, M.; Inoue, S. J. Org. Chem. 1999, 64, 9507. Related transformations have been used to form pyrano[2,3-c]benzopyrans; see:
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J. Org. Chem
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Miyazaki, H.1
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(b) Yadav, J. S.; Reddy, B. V. S.; Sadashiv, K.; Padmavani, B. Adv. Synth. Catal. 2004, 346, 607.
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51
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0036162067
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Related transformations have been used to form pyrano[2,3-c]benzothiopyrans, see
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Yadav, J. S.; Reddy, B. V. S.; Aruna, M.; Thomas, M. Synthesis 2002, 217. Related transformations have been used to form pyrano[2,3-c]benzothiopyrans, see:
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Yadav, J.S.1
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Inoue, S.; Wang, P.; Nagao, M.; Hoshino, Y.; Honda, K. Synlett 2005, 469.
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0036642529
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For an excellent review of o-quinonemethide chemistry, see
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For an excellent review of o-quinonemethide chemistry, see: Van. De Water, R. W.; Pettus, T. R. R. Tetrahedron 2002, 58, 5367.
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Van, D.1
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55
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77749281711
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trans
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trans
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