Enantioselective addition of diethylzinc to aldehydes induced by a new chiral Ti(IV) catalyst

Tetrahedron Asymmetry

Volumn 9, Issue 22, 1998, Pages 3979-3984

  Hwang, Chyuan Der ^a   Uang, Biing Jiun ^a  

^a NATIONAL TSING HUA UNIVERSITY   (Taiwan)

Author keywords

[No Author keywords available]

Indexed keywords

1,2 DICAMPHORSULFONAMIDOCYCLOHEXANE; ALDEHYDE; DIETHYLZINC; TITANIUM DERIVATIVE; UNCLASSIFIED DRUG;

ARTICLE; CARBON NUCLEAR MAGNETIC RESONANCE; CATALYSIS; CHIRALITY; ENANTIOMER; PRIORITY JOURNAL; PROTON NUCLEAR MAGNETIC RESONANCE; STEREOCHEMISTRY;

EID: 0032573441     PISSN: 09574166     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0957-4166(98)00415-7     Document Type: Article

References (43)

1. (a) Ojima, I. Catalytic Asymmetric Synthesis; VCH: Weinhem, 1993.
2. (b) Noyori, R. Asymmetric Catalysis in Organic Synthesis; John Wiley: New York, 1994.
3. Brunner, H.; Zettlmeier, W. Handbook of Enantioselective Catalysis; VCH: Weinheim, 1993.
4. For disulfonamides as ligands: (a) Takahashi, H.; Kawakita, T.; Yoshioka, M.; Kobayashi, S.; Ohno, M. Tetrahedron Lett. 1989, 30, 7095. (b) Yoshioka, M.; Kawakita, T.; Ohno, M. ibid. 1989, 30, 1657. (c) Qiu, J.; Guo, C.; Zhang, X.-M. J. Org. Chem. 1997, 62, 2665.
5. For disulfonamides as ligands: (a) Takahashi, H.; Kawakita, T.; Yoshioka, M.; Kobayashi, S.; Ohno, M. Tetrahedron Lett. 1989, 30, 7095. (b) Yoshioka, M.; Kawakita, T.; Ohno, M. ibid. 1989, 30, 1657. (c) Qiu, J.; Guo, C.; Zhang, X.-M. J. Org. Chem. 1997, 62, 2665.
6. For disulfonamides as ligands: (a) Takahashi, H.; Kawakita, T.; Yoshioka, M.; Kobayashi, S.; Ohno, M. Tetrahedron Lett. 1989, 30, 7095. (b) Yoshioka, M.; Kawakita, T.; Ohno, M. ibid. 1989, 30, 1657. (c) Qiu, J.; Guo, C.; Zhang, X.-M. J. Org. Chem. 1997, 62, 2665.
7. For TADDOLs as ligands: (a) Schmidt, B.; Seebach, D. Angew. Chem., Int. Ed. Engl. 1991, 30, 99. (b) Ito, Y. N.; Ariza, X.; Beck, A. K.; Bohac, A.; Granter, C.; Gawley, R. E.; Kuhnle, F. N. M.; Tuleja, J.; Wang, Y. M.; Seebach, D. Helv. Chim. Acta 1994, 77, 2071.
8. For TADDOLs as ligands: (a) Schmidt, B.; Seebach, D. Angew. Chem., Int. Ed. Engl. 1991, 30, 99. (b) Ito, Y. N.; Ariza, X.; Beck, A. K.; Bohac, A.; Granter, C.; Gawley, R. E.; Kuhnle, F. N. M.; Tuleja, J.; Wang, Y. M.; Seebach, D. Helv. Chim. Acta 1994, 77, 2071.
9. For more related ligands: (a) Ito, K.; Kimura, Y.; Okamura, H.; Katsuki, T. Synlett 1992, 573. (b) Soai, K.; Hirose, Y.; Ohno, Y. Tetrahedron: Asymmetry 1993, 4, 1473. (c) Dreisbach, C.; Kragl, U.; Wandrey, C. Synthesis 1994, 911. (d) Waldman, H.; Weigerding, M.; Dreisbach, C.; Wandrey, C. Helv. Chim. Acta 1994, 77, 2111. (e) Langer, F.; Schwink, L.; Devasagayaraj, A.; Chavant, P.-Y.; Knochel, P. J. Org. Chem. 1996, 61, 8229. (f) Nakai, T.; Mori, M. Tetrahedron Lett. 1997, 38, 6233. (g) Zhang, F. Y.; Yip, C.-W.; Cao, R.; Chan, A. S. C. Tetrahedron: Asymmetry 1997, 8, 585. (h) Zhang, F. Y.; Chan, A. S. C. ibid. 1997, 8, 3651. Cernerud, M.; Skrinning, A.; Bergere, I.; Moberg, C. ibid. 1997, 8, 3437.
10. For more related ligands: (a) Ito, K.; Kimura, Y.; Okamura, H.; Katsuki, T. Synlett 1992, 573. (b) Soai, K.; Hirose, Y.; Ohno, Y. Tetrahedron: Asymmetry 1993, 4, 1473. (c) Dreisbach, C.; Kragl, U.; Wandrey, C. Synthesis 1994, 911. (d) Waldman, H.; Weigerding, M.; Dreisbach, C.; Wandrey, C. Helv. Chim. Acta 1994, 77, 2111. (e) Langer, F.; Schwink, L.; Devasagayaraj, A.; Chavant, P.-Y.; Knochel, P. J. Org. Chem. 1996, 61, 8229. (f) Nakai, T.; Mori, M. Tetrahedron Lett. 1997, 38, 6233. (g) Zhang, F. Y.; Yip, C.-W.; Cao, R.; Chan, A. S. C. Tetrahedron: Asymmetry 1997, 8, 585. (h) Zhang, F. Y.; Chan, A. S. C. ibid. 1997, 8, 3651. Cernerud, M.; Skrinning, A.; Bergere, I.; Moberg, C. ibid. 1997, 8, 3437.
11. For more related ligands: (a) Ito, K.; Kimura, Y.; Okamura, H.; Katsuki, T. Synlett 1992, 573. (b) Soai, K.; Hirose, Y.; Ohno, Y. Tetrahedron: Asymmetry 1993, 4, 1473. (c) Dreisbach, C.; Kragl, U.; Wandrey, C. Synthesis 1994, 911. (d) Waldman, H.; Weigerding, M.; Dreisbach, C.; Wandrey, C. Helv. Chim. Acta 1994, 77, 2111. (e) Langer, F.; Schwink, L.; Devasagayaraj, A.; Chavant, P.-Y.; Knochel, P. J. Org. Chem. 1996, 61, 8229. (f) Nakai, T.; Mori, M. Tetrahedron Lett. 1997, 38, 6233. (g) Zhang, F. Y.; Yip, C.-W.; Cao, R.; Chan, A. S. C. Tetrahedron: Asymmetry 1997, 8, 585. (h) Zhang, F. Y.; Chan, A. S. C. ibid. 1997, 8, 3651. Cernerud, M.; Skrinning, A.; Bergere, I.; Moberg, C. ibid. 1997, 8, 3437.
12. For more related ligands: (a) Ito, K.; Kimura, Y.; Okamura, H.; Katsuki, T. Synlett 1992, 573. (b) Soai, K.; Hirose, Y.; Ohno, Y. Tetrahedron: Asymmetry 1993, 4, 1473. (c) Dreisbach, C.; Kragl, U.; Wandrey, C. Synthesis 1994, 911. (d) Waldman, H.; Weigerding, M.; Dreisbach, C.; Wandrey, C. Helv. Chim. Acta 1994, 77, 2111. (e) Langer, F.; Schwink, L.; Devasagayaraj, A.; Chavant, P.-Y.; Knochel, P. J. Org. Chem. 1996, 61, 8229. (f) Nakai, T.; Mori, M. Tetrahedron Lett. 1997, 38, 6233. (g) Zhang, F. Y.; Yip, C.-W.; Cao, R.; Chan, A. S. C. Tetrahedron: Asymmetry 1997, 8, 585. (h) Zhang, F. Y.; Chan, A. S. C. ibid. 1997, 8, 3651. Cernerud, M.; Skrinning, A.; Bergere, I.; Moberg, C. ibid. 1997, 8, 3437.
13. For more related ligands: (a) Ito, K.; Kimura, Y.; Okamura, H.; Katsuki, T. Synlett 1992, 573. (b) Soai, K.; Hirose, Y.; Ohno, Y. Tetrahedron: Asymmetry 1993, 4, 1473. (c) Dreisbach, C.; Kragl, U.; Wandrey, C. Synthesis 1994, 911. (d) Waldman, H.; Weigerding, M.; Dreisbach, C.; Wandrey, C. Helv. Chim. Acta 1994, 77, 2111. (e) Langer, F.; Schwink, L.; Devasagayaraj, A.; Chavant, P.-Y.; Knochel, P. J. Org. Chem. 1996, 61, 8229. (f) Nakai, T.; Mori, M. Tetrahedron Lett. 1997, 38, 6233. (g) Zhang, F. Y.; Yip, C.-W.; Cao, R.; Chan, A. S. C. Tetrahedron: Asymmetry 1997, 8, 585. (h) Zhang, F. Y.; Chan, A. S. C. ibid. 1997, 8, 3651. Cernerud, M.; Skrinning, A.; Bergere, I.; Moberg, C. ibid. 1997, 8, 3437.
14. For more related ligands: (a) Ito, K.; Kimura, Y.; Okamura, H.; Katsuki, T. Synlett 1992, 573. (b) Soai, K.; Hirose, Y.; Ohno, Y. Tetrahedron: Asymmetry 1993, 4, 1473. (c) Dreisbach, C.; Kragl, U.; Wandrey, C. Synthesis 1994, 911. (d) Waldman, H.; Weigerding, M.; Dreisbach, C.; Wandrey, C. Helv. Chim. Acta 1994, 77, 2111. (e) Langer, F.; Schwink, L.; Devasagayaraj, A.; Chavant, P.-Y.; Knochel, P. J. Org. Chem. 1996, 61, 8229. (f) Nakai, T.; Mori, M. Tetrahedron Lett. 1997, 38, 6233. (g) Zhang, F. Y.; Yip, C.-W.; Cao, R.; Chan, A. S. C. Tetrahedron: Asymmetry 1997, 8, 585. (h) Zhang, F. Y.; Chan, A. S. C. ibid. 1997, 8, 3651. Cernerud, M.; Skrinning, A.; Bergere, I.; Moberg, C. ibid. 1997, 8, 3437.
15. For more related ligands: (a) Ito, K.; Kimura, Y.; Okamura, H.; Katsuki, T. Synlett 1992, 573. (b) Soai, K.; Hirose, Y.; Ohno, Y. Tetrahedron: Asymmetry 1993, 4, 1473. (c) Dreisbach, C.; Kragl, U.; Wandrey, C. Synthesis 1994, 911. (d) Waldman, H.; Weigerding, M.; Dreisbach, C.; Wandrey, C. Helv. Chim. Acta 1994, 77, 2111. (e) Langer, F.; Schwink, L.; Devasagayaraj, A.; Chavant, P.-Y.; Knochel, P. J. Org. Chem. 1996, 61, 8229. (f) Nakai, T.; Mori, M. Tetrahedron Lett. 1997, 38, 6233. (g) Zhang, F. Y.; Yip, C.-W.; Cao, R.; Chan, A. S. C. Tetrahedron: Asymmetry 1997, 8, 585. (h) Zhang, F. Y.; Chan, A. S. C. ibid. 1997, 8, 3651. Cernerud, M.; Skrinning, A.; Bergere, I.; Moberg, C. ibid. 1997, 8, 3437.
16. For more related ligands: (a) Ito, K.; Kimura, Y.; Okamura, H.; Katsuki, T. Synlett 1992, 573. (b) Soai, K.; Hirose, Y.; Ohno, Y. Tetrahedron: Asymmetry 1993, 4, 1473. (c) Dreisbach, C.; Kragl, U.; Wandrey, C. Synthesis 1994, 911. (d) Waldman, H.; Weigerding, M.; Dreisbach, C.; Wandrey, C. Helv. Chim. Acta 1994, 77, 2111. (e) Langer, F.; Schwink, L.; Devasagayaraj, A.; Chavant, P.-Y.; Knochel, P. J. Org. Chem. 1996, 61, 8229. (f) Nakai, T.; Mori, M. Tetrahedron Lett. 1997, 38, 6233. (g) Zhang, F. Y.; Yip, C.-W.; Cao, R.; Chan, A. S. C. Tetrahedron: Asymmetry 1997, 8, 585. (h) Zhang, F. Y.; Chan, A. S. C. ibid. 1997, 8, 3651. Cernerud, M.; Skrinning, A.; Bergere, I.; Moberg, C. ibid. 1997, 8, 3437.
17. For more related ligands: (a) Ito, K.; Kimura, Y.; Okamura, H.; Katsuki, T. Synlett 1992, 573. (b) Soai, K.; Hirose, Y.; Ohno, Y. Tetrahedron: Asymmetry 1993, 4, 1473. (c) Dreisbach, C.; Kragl, U.; Wandrey, C. Synthesis 1994, 911. (d) Waldman, H.; Weigerding, M.; Dreisbach, C.; Wandrey, C. Helv. Chim. Acta 1994, 77, 2111. (e) Langer, F.; Schwink, L.; Devasagayaraj, A.; Chavant, P.-Y.; Knochel, P. J. Org. Chem. 1996, 61, 8229. (f) Nakai, T.; Mori, M. Tetrahedron Lett. 1997, 38, 6233. (g) Zhang, F. Y.; Yip, C.-W.; Cao, R.; Chan, A. S. C. Tetrahedron: Asymmetry 1997, 8, 585. (h) Zhang, F. Y.; Chan, A. S. C. ibid. 1997, 8, 3651. Cernerud, M.; Skrinning, A.; Bergere, I.; Moberg, C. ibid. 1997, 8, 3437.
18. For reviews see: (a) Noyori, R.; Kitamura, M. Angew. Chem., Int. Ed. Engl. 1991, 30, 49. (b) Soai, K.; Niwa, S. Chem. Rev. 1992, 92, 833.
19. For reviews see: (a) Noyori, R.; Kitamura, M. Angew. Chem., Int. Ed. Engl. 1991, 30, 49. (b) Soai, K.; Niwa, S. Chem. Rev. 1992, 92, 833.
20. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
21. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
22. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
23. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
24. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
25. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
26. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
27. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
28. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
29. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
30. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
31. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
32. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
33. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
34. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
35. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
36. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
37. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
38. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
39. For more recent related works: (a) Bolm, C.; Fernandez, K. M.; Seger, A.; Raabe, G. Synlett 1997, 1051. (b) Asami, M.; Inoue, S. Bull. Chem. Soc. Jpn. 1997, 70, 1687. (c) Kitajima, H.; Ito, K.; Katsuki, T.; Aoki, Y. Bull. Chem. Soc. Jpn. 1997, 70, 207. (d) Hu, Q.-S.; Huang, W.-S.; Pu, L. J. Am. Chem. Soc. 1997, 119, 12454. (e) Nakano, H.; Iwasa, K.; Hongo, H. Heterocycles 1997, 44, 435. (f) Vidalferran, A.; Moyano, A.; Pericas, M. A.; Riera, A. J. Org. Chem. 1997, 62, 4970. (g) Prasad, K. R. K.; Joshi, N. N. J. Org. Chem. 1997, 62, 3770. (h) Williams, D. R.; Fromhold, M. G. Synlett 1997, 523. (i) Fulton, D. A.; Gibson, C. L. Tetrahedron Lett. 1997, 38, 2019. (j) Wilken, J.; Groger, H.; Kossenjans, M.; Martens, J. Tetrahedron: Asymmetry 1997, 8, 2761. (k) Chelucci, G.; Pinna, G. A.; Saba, A. ibid. 1997, 8, 2571. (l) Beliczey, J.; Giffels, G.; Kragl, U.; Wandrey, C. ibid. 1997, 8, 1529. (m) Cicchi, S.; Crea, S.; Goti, A.; Brandi, A. ibid. 1997, 8, 293. (n) Goralski, C. T.; Chrisman, W.; Hasha, D. L.; Nicholson, L. W.; Rudolf, P. R.; Zakett, D.; Singaram, B. ibid. 1997, 8, 3863. (o) Pu, L.; Hu, Q. S.; Huang, W.-S. J. Org. Chem. 1998, 63, 1364. (p) Brunel, J. M.; Constantieux, T.; Legrand, O.; Buono, G. Tetrahedron Lett. 1998, 39, 2961. (q) Anderson, J. C.; Harding, M. Chem. Commun. 1998, 393. (r) Cho, B. T.; Chun, Y. S. Tetrahedron: Asymmetry 1998, 9, 1489. (s) Bringmann, G.; Breuning, M. ibid. 1998, 9, 667. (t) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651.
40. Kitamura, M.; Suga, S.; Kawai, K.; Noyori, R. J. Am. Chem. Soc. 1986, 108, 6071.
41. Diethylzinc (neat) is a flammable and moisture-sensitive liquid, which must be handled with care to avoid a fire upon exposure to air.
42. Soai, K.; Nishi, M.; Ito, Y. Chem. Lett. 1987, 2405.
43. Watanabe, M.; Araki, S.; Butsugan, Y.; Uemura, M. J. Org. Chem. 1991, 56, 2218.