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0003916113
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Synthetic Applications of 1,3-Dipolar Cycloaddition Chemistry toward Heterocycles and Natural Products
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3
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(e) Desimoni, G.; Faita, G.; Mortoni, A.; Righetti, P. Tetrahedron Lett. 1999, 40, 2001.
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(f) Iwasa, S.; Tsushima, S.; Shimada, T.; Nishiyama, H. Tetrahedron 2002, 58, 227.
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(g) Hori, K.; Kodama, H.; Ohta, T.; Furukawa, I. J. Org. Chem. 1999, 64, 5017.
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(h) Suga, H.; Kakehi, A.; Ito, S.; Sugimoto, H. Bull. Chem. Soc. Jpn. 2003, 76, 327.
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(i) Sibi, M. P.; Ma, Z.; Jasperse, C. P. J. Am. Chem. Soc. 2004, 126, 718.
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13
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0037042276
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For reactions with α,β-unsaturated aldehydes, see: a
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For reactions with α,β-unsaturated aldehydes, see: (a) Viton, F.; Bernardinelli, G.; Kündig, E. P. J. Am. Chem. Soc. 2002, 124, 4968.
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0001660873
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(b) Mita, T.; Ohtsuki, N.; Ikeno, T.; Yamada, T. Org. Lett. 2002, 4, 2457.
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1642404440
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(c) Shirahase, M.; Kamenasa, S.; Oderaotoshi, Y. Org. Lett. 2004, 6, 675.
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(d) Carmona, D.; Lamata, M. P.; Viguri, F.; Rodriguez, R.; Oro, L. A.; Balana, A. I.; Lahoz, F. J.; Tejero, T.; Merino, P.; Franco, S.; Montesa, I. J. Am. Chem. Soc. 2004, 126, 2716.
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Lahoz, F.J.7
Tejero, T.8
Merino, P.9
Franco, S.10
Montesa, I.11
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(e) Kano, T.; Hashimoto, T.; Maruoka, K. J. Am. Chem. Soc. 2005, 127, 11926.
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Kano, T.1
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Sibi, M. P.; Itoh, K.; Jasperse, C. P. J. Am. Chem. Soc. 2004, 126, 5366.
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Sibi, M.P.1
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20444457507
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Sibi, M. P.; Stanley, L. M.; Jasperse, C. P. J. Am. Chem. Soc. 2005, 127, 8276.
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Sibi, M.P.1
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(b) Kano, T.; Hashimoto, T.; Maruoka, K. J. Am. Chem. Soc. 2006, 128, 2174.
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Kano, T.1
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(a) Suga, H.; Inoue, K.; Inoue, S.; Kakehi, A. J. Am. Chem. Soc. 2002, 124, 14836.
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(b) Suga, H.; Inoue, K.; Inoue, S.; Kakehi, A.; Shiro, M. J. Org. Chem. 2005, 70, 47.
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Suga, H.1
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Shiro, M.5
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24
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22244459251
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For synthetic Utilities of chiral pyrazolidines as building blocks, see: Shirakawa, S, Lombardi, P. J, Leighton, J. L. J. Am. Chem. Soc. 2005, 127, 9974. Also see ref 10a
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For synthetic Utilities of chiral pyrazolidines as building blocks, see: Shirakawa, S.; Lombardi, P. J.; Leighton, J. L. J. Am. Chem. Soc. 2005, 127, 9974. Also see ref 10a.
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26
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(b) Suárez., A.; Downey, W.; Fu, G. C. J. Am. Chem. Soc. 2005, 127, 11244.
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Suárez, A.1
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0037146071
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(a) Kobayashi, S.; Shimizu, H.; Yamashita, Y.; Ishitani, H.; Kobayashi, J. J. Am. Chem. Soc. 2002, 124, 13678.
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Kobayashi, S.1
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Kobayashi, J.5
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29
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33749348910
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During the preparation of this manuscript, a related paper using chiral organocatalysts has been reported. See
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During the preparation of this manuscript, a related paper using chiral organocatalysts has been reported. See: Chen, W.; Yuan, X.-H.; Li, R.; Du, W.; Wu, Y.; Ding, L.-S.; Chen, Y.-C. Adv. Synth. Catal. 2006, 348, 1818.
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(2006)
Adv. Synth. Catal
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Chen, W.1
Yuan, X.-H.2
Li, R.3
Du, W.4
Wu, Y.5
Ding, L.-S.6
Chen, Y.-C.7
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30
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33846410365
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Lewis acid, reaction time, trans/cis ratio, and yield were shown in order: TiCl4, 240 h, 62:38, 14, Et2AlCl, 240 h, 58:42, 8, Zn(OTf)2, 240 h, 71:29, 26, Yb(OTf)3, 192 h, 89:11, 88, Mg(OTf)2, 264 h, 96:4, 90, Co(ClO4) 2·6H2O, 90 h, 91:1, 98, Ni(ClO4) 2·6H2O, 21 h, 98:2, 95, Without Lewis acid, reflux in CHCl3 for 24 h, 49:51, 52
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3 for 24 h, 49:51, 52%.
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32
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1842478921
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(b) Suga, H.; Kakehi, A.; Mitsuda, M. Bull. Chem. Soc. Jpn. 2004, 77, 561.
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(2004)
Bull. Chem. Soc. Jpn
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Suga, H.1
Kakehi, A.2
Mitsuda, M.3
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33
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3142753716
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(c) Suga, H.; Kitamura, T.; Kakehi, A.; Baba, T. Chem. Commun. 2004, 1414.
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(2004)
Chem. Commun
, pp. 1414
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Suga, H.1
Kitamura, T.2
Kakehi, A.3
Baba, T.4
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34
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33846438708
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It is noteworthy that a 5,5-dimethyl moiety played an important role for high enantioselectivity. The reaction of 1-benzylidene-3-oxopyrazolidin-1-ium-2- ide under conditions similar to entry 4 gave a trans-adduct selectively (trans/cis = 93:7) with only 35% ee (yield of 86%).
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It is noteworthy that a 5,5-dimethyl moiety played an important role for high enantioselectivity. The reaction of 1-benzylidene-3-oxopyrazolidin-1-ium-2- ide under conditions similar to entry 4 gave a trans-adduct selectively (trans/cis = 93:7) with only 35% ee (yield of 86%).
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35
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33846447894
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Although the reaction proceeded smoothly, the 1H NMR study indicated that the Ni(II) complex mainly coordinated to 1a rather than to 2
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1H NMR study indicated that the Ni(II) complex mainly coordinated to 1a rather than to 2.
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36
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33846414779
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The structure of the complex was optimized by PM3 calculations (Spartan 04).
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The structure of the complex was optimized by PM3 calculations (Spartan 04).
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