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For the electrophilic addition to the central carbon of allenes followed by nucleophilic addition to the terminal carbon atom. see W. Smadja. Chem. Rev. 1983, 83, 263-320; D. J. Pasto, Tetrahedron 1984, 40. 2805-2827; B. M. Trost, V. J. Gerusz, J. Am. Chem. Soc. 1995, 117. 5156-5157; K. Okuro, H. Alper, J. Org. Chem. 1997, 62, 1566-1567; A. S. K. Hashmi, T. L. Ruppert, T. Kröfel, J. W. Bats, J. Org. Chem. 1997, 62, 7295-7304; M. Al-Masum, Y. Yamamoto, J. Am. Chem. Soc. 1998, 120, 3809-3810.
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24
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Similar coupling patterns and nOes were observed for cis-3f and cis-3i. See the Experimental Section for the characteristic coupling patterns that trans-3 displays
-
Similar coupling patterns and nOes were observed for cis-3f and cis-3i. See the Experimental Section for the characteristic coupling patterns that trans-3 displays.
-
-
-
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25
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0030002988
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A radical mechanism involving homolytic N-S bond cleavage may be ruled out based on the fact that methanesulfonamide 1c (run 10, Table 1) shows reaction features similar to those of toluenesulfonamides 1a, b: B. Quiclet-Sirc. S. Z. Zard, J. Am. Chem. Soc. 1996, 118, 1209-1210; S. Kim, J.-Y. Yoon, J. Am. Chem. Soc. 1997, 119, 5982-5983, and references therein.
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26
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0000386628
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-
and references therein
-
A radical mechanism involving homolytic N-S bond cleavage may be ruled out based on the fact that methanesulfonamide 1c (run 10, Table 1) shows reaction features similar to those of toluenesulfonamides 1a, b: B. Quiclet-Sirc. S. Z. Zard, J. Am. Chem. Soc. 1996, 118, 1209-1210; S. Kim, J.-Y. Yoon, J. Am. Chem. Soc. 1997, 119, 5982-5983, and references therein.
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A similar four-membered cyclic transition state has been proposed for the 1,3-shift of chlorine in chlorocarbonylketene: J. Finnerty, J. Andraos, Y. Yamamoto, M. W. Wong, C. Wentrup, J. Am. Chem. Soc. 1998, 120, 1701-1704.: see also H. Binas, M. W. Wong, C. Wentrup, Chem. Eur. J. 1997, 31, 237-248, and references therein.
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28
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0032481637
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-
and references therein
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A similar four-membered cyclic transition state has been proposed for the 1,3-shift of chlorine in chlorocarbonylketene: J. Finnerty, J. Andraos, Y. Yamamoto, M. W. Wong, C. Wentrup, J. Am. Chem. Soc. 1998, 120, 1701-1704.: see also H. Binas, M. W. Wong, C. Wentrup, Chem. Eur. J. 1997, 31, 237-248, and references therein.
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2 bond cleavage: S. M. Weinreb, D. M. Demko, T. A. Lessen, Tetrahedron Lett. 1986, 27. 2099-2102; T. Fukuyama, C.-K. Jow, M. Cheung, Tetrahedron Lett. 1995, 36, 6373-6374; C. Huart, L. Ghosez, Angew. Chem. 1997, 109, 627-629; Angew. Chem. Int. Ed. Engl. 1997, 36, 634-636.
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2 bond cleavage: S. M. Weinreb, D. M. Demko, T. A. Lessen, Tetrahedron Lett. 1986, 27. 2099-2102; T. Fukuyama, C.-K. Jow, M. Cheung, Tetrahedron Lett. 1995, 36, 6373-6374; C. Huart, L. Ghosez, Angew. Chem. 1997, 109, 627-629; Angew. Chem. Int. Ed. Engl. 1997, 36, 634-636.
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2 bond cleavage: S. M. Weinreb, D. M. Demko, T. A. Lessen, Tetrahedron Lett. 1986, 27. 2099-2102; T. Fukuyama, C.-K. Jow, M. Cheung, Tetrahedron Lett. 1995, 36, 6373-6374; C. Huart, L. Ghosez, Angew. Chem. 1997, 109, 627-629; Angew. Chem. Int. Ed. Engl. 1997, 36, 634-636.
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2 bond cleavage: S. M. Weinreb, D. M. Demko, T. A. Lessen, Tetrahedron Lett. 1986, 27. 2099-2102; T. Fukuyama, C.-K. Jow, M. Cheung, Tetrahedron Lett. 1995, 36, 6373-6374; C. Huart, L. Ghosez, Angew. Chem. 1997, 109, 627-629; Angew. Chem. Int. Ed. Engl. 1997, 36, 634-636.
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Weinreb, S.M.1
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Lessen, T.A.3
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33
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0029119899
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2 bond cleavage: S. M. Weinreb, D. M. Demko, T. A. Lessen, Tetrahedron Lett. 1986, 27. 2099-2102; T. Fukuyama, C.-K. Jow, M. Cheung, Tetrahedron Lett. 1995, 36, 6373-6374; C. Huart, L. Ghosez, Angew. Chem. 1997, 109, 627-629; Angew. Chem. Int. Ed. Engl. 1997, 36, 634-636.
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Fukuyama, T.1
Jow, C.-K.2
Cheung, M.3
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34
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0001035323
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2 bond cleavage: S. M. Weinreb, D. M. Demko, T. A. Lessen, Tetrahedron Lett. 1986, 27. 2099-2102; T. Fukuyama, C.-K. Jow, M. Cheung, Tetrahedron Lett. 1995, 36, 6373-6374; C. Huart, L. Ghosez, Angew. Chem. 1997, 109, 627-629; Angew. Chem. Int. Ed. Engl. 1997, 36, 634-636.
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Angew. Chem.
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, pp. 627-629
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Huart, C.1
Ghosez, L.2
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35
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0030948204
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2 bond cleavage: S. M. Weinreb, D. M. Demko, T. A. Lessen, Tetrahedron Lett. 1986, 27. 2099-2102; T. Fukuyama, C.-K. Jow, M. Cheung, Tetrahedron Lett. 1995, 36, 6373-6374; C. Huart, L. Ghosez, Angew. Chem. 1997, 109, 627-629; Angew. Chem. Int. Ed. Engl. 1997, 36, 634-636.
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(1997)
Angew. Chem. Int. Ed. Engl.
, vol.36
, pp. 634-636
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36
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0345574933
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Thiophene failed to react with 1a to furnish 3. Instead, 4-vinyl-4-oxazolin-2-one (product of a 1,3-hydrogen shift) was provided in 88% yield (1a/thiophene = 1/100 mol/mol. 80 C. 11 h)
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Thiophene failed to react with 1a to furnish 3. Instead, 4-vinyl-4-oxazolin-2-one (product of a 1,3-hydrogen shift) was provided in 88% yield (1a/thiophene = 1/100 mol/mol. 80 C. 11 h).
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37
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0344712905
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1H NMR spectroscopy and HPLC. There were only very small amounts of impurities; 20, 29, and 51% conversions after 2,4, and 9 h at 70 C, respectively
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1H NMR spectroscopy and HPLC. There were only very small amounts of impurities; 20, 29, and 51% conversions after 2,4, and 9 h at 70 C, respectively.
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38
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0000570210
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Eds.: B. M. Trost, I. Fleming, L. A. Paquette. Pergamon, Oxford
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D. L. Boger in Comprehensive Organic Synthesis, Vol. 5 (Eds.: B. M. Trost, I. Fleming, L. A. Paquette). Pergamon, Oxford, 1991, pp. 470-507; L. F. Tietze, G. Kettschau, Top. Curr Chem. 1997, 189, 1-120.
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Boger, D.L.1
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0001971115
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D. L. Boger in Comprehensive Organic Synthesis, Vol. 5 (Eds.: B. M. Trost, I. Fleming, L. A. Paquette). Pergamon, Oxford, 1991, pp. 470-507; L. F. Tietze, G. Kettschau, Top. Curr Chem. 1997, 189, 1-120.
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Top. Curr Chem.
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Tietze, L.F.1
Kettschau, G.2
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40
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0028328337
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T. Bando, H. Harayama, Y. Fukazawa, M. Shiro, K. Fugami, S. Tanaka, Y. Tamaru, J. Org. Chem. 1994, 59, 1465-1474.
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(1994)
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Bando, T.1
Harayama, H.2
Fukazawa, Y.3
Shiro, M.4
Fugami, K.5
Tanaka, S.6
Tamaru, Y.7
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41
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0344280958
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We thank the referee who pointed out the possibility that 3g might be formed by the Diels - Alder addition of turan (4π) and the vinyl group of 5 and subsequent 1-aza-Cope rearrangement
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We thank the referee who pointed out the possibility that 3g might be formed by the Diels - Alder addition of turan (4π) and the vinyl group of 5 and subsequent 1-aza-Cope rearrangement.
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