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(a) Evans, D. A.; Olhava, E. J.; Johnson, J. S.; Janey, J. M. Angew. Chem. Int. Ed. 1998, 37, 3372.
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See ref. 3d and 4
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(a) See ref. 3d and 4.
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22
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0034812887
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For select additional examples, see: b
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For select additional examples, see: (b) Sibi, M. P.; Venkatraman, L.; Liu, M.; Jasperse, C. P. J. Am. Chem. Soc. 2001, 123, 8444.
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(c) Jensen, K. B.; Gothelf, K. V.; Hazell, R. G.; Jørgensen, K. A. J. Org. Chem. 1997, 62, 2471.
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25
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33847028704
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See ref. 8b
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(a) See ref. 8b.
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26
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20444457507
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For recent examples from our laboratory, see: b
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For recent examples from our laboratory, see: (b) Sibi, M. P.; Stanley, L. M.; Jasperse, C. P. J. Am. Chem. Soc. 2005, 127, 8276.
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(c) Sibi, M. P.; Petrovic, G.; Zimmerman, J. J. Am. Chem. Soc. 2005, 127, 2390.
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(d) Sibi, M. P.; Prabagaran, N.; Ghorpade, S. G.; Jasperse, C. P. J. Am. Chem. Soc. 2003, 125, 11796.
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Jasperse, C.P.4
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29
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33847019970
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All new compounds showed analytical and spectral characteristics consistent with their structure. An experimental procedure and spectral data for select cycloadducts are provided
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All new compounds showed analytical and spectral characteristics consistent with their structure. An experimental procedure and spectral data for select cycloadducts are provided.
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30
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0029882080
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Templates 3, 4, 8 and 11-14 are commercially available. Templates 5-7, 9, and 10 were prepared using literature procedures. For compound 5, see: (a) Reddy, P. A.; Hsiang, B. C. H.; Latifi, T. N.; Hill, W.; Woodward, K. E.; Rothman, S. M.; Ferrendelli, J. A.; Covey, D. A. J. Med. Chem. 1996, 39, 1898.
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Templates 3, 4, 8 and 11-14 are commercially available. Templates 5-7, 9, and 10 were prepared using literature procedures. For compound 5, see: (a) Reddy, P. A.; Hsiang, B. C. H.; Latifi, T. N.; Hill, W.; Woodward, K. E.; Rothman, S. M.; Ferrendelli, J. A.; Covey, D. A. J. Med. Chem. 1996, 39, 1898.
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31
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10144230713
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For compounds 6 and 7, see: (b) Bhatia, P. A.; Brooks, C. D. W.; Basha, A.; Ratajczyk, J. D.; Gunn, B. P.; Bouska, J. B.; Lanni, C.; Young, P. R.; Bell, R. L.; Carter, G. W. J. Med. Chem. 1996, 39, 3938.
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For compounds 6 and 7, see: (b) Bhatia, P. A.; Brooks, C. D. W.; Basha, A.; Ratajczyk, J. D.; Gunn, B. P.; Bouska, J. B.; Lanni, C.; Young, P. R.; Bell, R. L.; Carter, G. W. J. Med. Chem. 1996, 39, 3938.
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33
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33847069991
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For compound 9, see ref. 11b.
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(d) For compound 9, see ref. 11b.
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34
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0038657602
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Akiyama, T.; Horiguchi, N.; Ida, T.; Ozaki, S. Chem. Lett. 1995, 975.
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33847069556
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See ref. 12c
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(d) See ref. 12c.
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39
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0000188220
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33847028324
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See ref. 3c
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(a) See ref. 3c.
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41
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33847017245
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General Procedure for the Enantioselective Diels-Alder Reactions. A mixture of 1 (20 mg, 0.055 mmol) and Cu(OTf)2 (18 mg, 0.05 mmol) in CH2Cl2 (2 mL) was stirred at r.t. for 1 h to give a clear green solution. A solution of dienophile (0.5 mmol) in CH 2Cl2 (2 mL) was added at the temperature given in the tables, followed by freshly distilled cyclopentadiene (165 mg, 2.5 mmol, The reaction was monitored by TLC. After completion of the reaction, H2O (2 mL) was added and the mixture was extracted with CH2Cl 2, washed with brine and dried. The solvent was evaporated and the residue was purified by chromatography to give pure product. The endo/exo ratio was evaluated on the basis of 1H NMR spectrum and the enantiomeric purity was determined by HPLC. DA Adduct from Compound 4, α]D25 -176.3 c 2.2, CHCl3, 97% ee estimated on t
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3): δ = 20.7, 26.4, 26.6, 36.5, 44.3, 47.2, 47.3, 49.7, 52.8, 57.1, 60.8, 127.6, 128.6, 129.1, 131.1, 138.4, 140.0, 171.6, 174.6.
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