Synthesis of constrained α-amino acid derivatives via ring-closing olefin metathesis

Bioorganic and Medicinal Chemistry Letters

Volumn 8, Issue 3, 1998, Pages 257-260

  Kotha, Sambasivarao ^a   Sreenivasachary, Nampally ^a  

^a INDIAN INSTITUTE OF TECHNOLOGY BOMBAY   (India)

Author keywords

[No Author keywords available]

Indexed keywords

AMINO ACID DERIVATIVE;

ARTICLE; CHEMICAL MODIFICATION; DRUG SYNTHESIS; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; REACTION ANALYSIS;

ALKENES; AMINO ACIDS; CATALYSIS; MAGNETIC RESONANCE SPECTROSCOPY; MOLECULAR STRUCTURE;

EID: 0032477847     PISSN: 0960894X     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0960-894X(98)00002-X     Document Type: Article

References (57)

1. 1. For some recent examples of unusual α-amino acids preparation, see:
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19. 2. Hruby, V.J. Biopolymers 1993, 33, 1073; Hermkens, P. H. H.; Ottenheijm, H. C. J.; van der Werf-Pieters, J. M. L.; Broekkamp, C. L. E.; de Boer, T.; van Nispen. J. W. Recl. Trav. Chim. Pays-Bas 1993, 112, 95; Adang, A. E. P.; Hermkens, P. H. H.; Linders, J. T. M.; Ottenheijm, H. C. J.; van Staveren, C. J. Recl. Trav. Chim. Pays-Bas 1994, 113, 63; Heimgartner, H. Angew. Chem., Int. Ed. Engl. 1991, 30, 238; Balaram, P. Curr. Opin. Struct. Biol. 1992, 2, 845; Toniolo, C.; Benedetti, E. ISI Atlas of Science Biochemistry 1988, 225; Degrado, W. F. Adv. Protein. Chem. 1988, 39; Griffiths, E. C. In A Textbook of Drug Design and Development; Krogsgaard-Larsen, P.; Bundgaard, H., Eds.; Horwood Academic, Chur, 1991, Chapter 14; Obrecht, D.; Altorfer, M.; Lehmann, C.; Schonholzer, P.; Muller, K.; J. Org. Chem. 1996, 61, 4080; Liskamp, R. M. J. Recl Trav. Chim. Pays-Bas 1994, 113, 1.
20. 2. Hruby, V.J. Biopolymers 1993, 33, 1073; Hermkens, P. H. H.; Ottenheijm, H. C. J.; van der Werf-Pieters, J. M. L.; Broekkamp, C. L. E.; de Boer, T.; van Nispen. J. W. Recl. Trav. Chim. Pays-Bas 1993, 112, 95; Adang, A. E. P.; Hermkens, P. H. H.; Linders, J. T. M.; Ottenheijm, H. C. J.; van Staveren, C. J. Recl. Trav. Chim. Pays-Bas 1994, 113, 63; Heimgartner, H. Angew. Chem., Int. Ed. Engl. 1991, 30, 238; Balaram, P. Curr. Opin. Struct. Biol. 1992, 2, 845; Toniolo, C.; Benedetti, E. ISI Atlas of Science Biochemistry 1988, 225; Degrado, W. F. Adv. Protein. Chem. 1988, 39; Griffiths, E. C. In A Textbook of Drug Design and Development; Krogsgaard-Larsen, P.; Bundgaard, H., Eds.; Horwood Academic, Chur, 1991, Chapter 14; Obrecht, D.; Altorfer, M.; Lehmann, C.; Schonholzer, P.; Muller, K.; J. Org. Chem. 1996, 61, 4080; Liskamp, R. M. J. Recl Trav. Chim. Pays-Bas 1994, 113, 1.
21. 2. Hruby, V.J. Biopolymers 1993, 33, 1073; Hermkens, P. H. H.; Ottenheijm, H. C. J.; van der Werf-Pieters, J. M. L.; Broekkamp, C. L. E.; de Boer, T.; van Nispen. J. W. Recl. Trav. Chim. Pays-Bas 1993, 112, 95; Adang, A. E. P.; Hermkens, P. H. H.; Linders, J. T. M.; Ottenheijm, H. C. J.; van Staveren, C. J. Recl. Trav. Chim. Pays-Bas 1994, 113, 63; Heimgartner, H. Angew. Chem., Int. Ed. Engl. 1991, 30, 238; Balaram, P. Curr. Opin. Struct. Biol. 1992, 2, 845; Toniolo, C.; Benedetti, E. ISI Atlas of Science Biochemistry 1988, 225; Degrado, W. F. Adv. Protein. Chem. 1988, 39; Griffiths, E. C. In A Textbook of Drug Design and Development; Krogsgaard-Larsen, P.; Bundgaard, H., Eds.; Horwood Academic, Chur, 1991, Chapter 14; Obrecht, D.; Altorfer, M.; Lehmann, C.; Schonholzer, P.; Muller, K.; J. Org. Chem. 1996, 61, 4080; Liskamp, R. M. J. Recl Trav. Chim. Pays-Bas 1994, 113, 1.
22. 2. Hruby, V.J. Biopolymers 1993, 33, 1073; Hermkens, P. H. H.; Ottenheijm, H. C. J.; van der Werf-Pieters, J. M. L.; Broekkamp, C. L. E.; de Boer, T.; van Nispen. J. W. Recl. Trav. Chim. Pays-Bas 1993, 112, 95; Adang, A. E. P.; Hermkens, P. H. H.; Linders, J. T. M.; Ottenheijm, H. C. J.; van Staveren, C. J. Recl. Trav. Chim. Pays-Bas 1994, 113, 63; Heimgartner, H. Angew. Chem., Int. Ed. Engl. 1991, 30, 238; Balaram, P. Curr. Opin. Struct. Biol. 1992, 2, 845; Toniolo, C.; Benedetti, E. ISI Atlas of Science Biochemistry 1988, 225; Degrado, W. F. Adv. Protein. Chem. 1988, 39; Griffiths, E. C. In A Textbook of Drug Design and Development; Krogsgaard-Larsen, P.; Bundgaard, H., Eds.; Horwood Academic, Chur, 1991, Chapter 14; Obrecht, D.; Altorfer, M.; Lehmann, C.; Schonholzer, P.; Muller, K.; J. Org. Chem. 1996, 61, 4080; Liskamp, R. M. J. Recl Trav. Chim. Pays-Bas 1994, 113, 1.
23. 2. Hruby, V.J. Biopolymers 1993, 33, 1073; Hermkens, P. H. H.; Ottenheijm, H. C. J.; van der Werf-Pieters, J. M. L.; Broekkamp, C. L. E.; de Boer, T.; van Nispen. J. W. Recl. Trav. Chim. Pays-Bas 1993, 112, 95; Adang, A. E. P.; Hermkens, P. H. H.; Linders, J. T. M.; Ottenheijm, H. C. J.; van Staveren, C. J. Recl. Trav. Chim. Pays-Bas 1994, 113, 63; Heimgartner, H. Angew. Chem., Int. Ed. Engl. 1991, 30, 238; Balaram, P. Curr. Opin. Struct. Biol. 1992, 2, 845; Toniolo, C.; Benedetti, E. ISI Atlas of Science Biochemistry 1988, 225; Degrado, W. F. Adv. Protein. Chem. 1988, 39; Griffiths, E. C. In A Textbook of Drug Design and Development; Krogsgaard-Larsen, P.; Bundgaard, H., Eds.; Horwood Academic, Chur, 1991, Chapter 14; Obrecht, D.; Altorfer, M.; Lehmann, C.; Schonholzer, P.; Muller, K.; J. Org. Chem. 1996, 61, 4080; Liskamp, R. M. J. Recl Trav. Chim. Pays-Bas 1994, 113, 1.
24. 2. Hruby, V.J. Biopolymers 1993, 33, 1073; Hermkens, P. H. H.; Ottenheijm, H. C. J.; van der Werf-Pieters, J. M. L.; Broekkamp, C. L. E.; de Boer, T.; van Nispen. J. W. Recl. Trav. Chim. Pays-Bas 1993, 112, 95; Adang, A. E. P.; Hermkens, P. H. H.; Linders, J. T. M.; Ottenheijm, H. C. J.; van Staveren, C. J. Recl. Trav. Chim. Pays-Bas 1994, 113, 63; Heimgartner, H. Angew. Chem., Int. Ed. Engl. 1991, 30, 238; Balaram, P. Curr. Opin. Struct. Biol. 1992, 2, 845; Toniolo, C.; Benedetti, E. ISI Atlas of Science Biochemistry 1988, 225; Degrado, W. F. Adv. Protein. Chem. 1988, 39; Griffiths, E. C. In A Textbook of Drug Design and Development; Krogsgaard-Larsen, P.; Bundgaard, H., Eds.; Horwood Academic, Chur, 1991, Chapter 14; Obrecht, D.; Altorfer, M.; Lehmann, C.; Schonholzer, P.; Muller, K.; J. Org. Chem. 1996, 61, 4080; Liskamp, R. M. J. Recl Trav. Chim. Pays-Bas 1994, 113, 1.
25. 2. Hruby, V.J. Biopolymers 1993, 33, 1073; Hermkens, P. H. H.; Ottenheijm, H. C. J.; van der Werf-Pieters, J. M. L.; Broekkamp, C. L. E.; de Boer, T.; van Nispen. J. W. Recl. Trav. Chim. Pays-Bas 1993, 112, 95; Adang, A. E. P.; Hermkens, P. H. H.; Linders, J. T. M.; Ottenheijm, H. C. J.; van Staveren, C. J. Recl. Trav. Chim. Pays-Bas 1994, 113, 63; Heimgartner, H. Angew. Chem., Int. Ed. Engl. 1991, 30, 238; Balaram, P. Curr. Opin. Struct. Biol. 1992, 2, 845; Toniolo, C.; Benedetti, E. ISI Atlas of Science Biochemistry 1988, 225; Degrado, W. F. Adv. Protein. Chem. 1988, 39; Griffiths, E. C. In A Textbook of Drug Design and Development; Krogsgaard-Larsen, P.; Bundgaard, H., Eds.; Horwood Academic, Chur, 1991, Chapter 14; Obrecht, D.; Altorfer, M.; Lehmann, C.; Schonholzer, P.; Muller, K.; J. Org. Chem. 1996, 61, 4080; Liskamp, R. M. J. Recl Trav. Chim. Pays-Bas 1994, 113, 1.
26. 3. Duthaler, R. O. Tetrahedron 1994, 50, 1539; Coopla, G. M.; Schuster, M. F. Asymmetric Synthesis using Amino Acids, John Wiley, New York, 1987; Monaghan, D. T.; Bridges, R. J.; Cotman, C. W. Annu. Rev. Pharmacol. Toxicol. 1989, 29, 365.; Johnson, G.; Bigge, C. F. Annu. Reports. Med. Chem. 1991, 26, 11; Williams, R. M. Synthesis of Optically Active a-Amino Acids, Pergamon Press, Oxford, 1989.
27. 3. Duthaler, R. O. Tetrahedron 1994, 50, 1539; Coopla, G. M.; Schuster, M. F. Asymmetric Synthesis using Amino Acids, John Wiley, New York, 1987; Monaghan, D. T.; Bridges, R. J.; Cotman, C. W. Annu. Rev. Pharmacol. Toxicol. 1989, 29, 365.; Johnson, G.; Bigge, C. F. Annu. Reports. Med. Chem. 1991, 26, 11; Williams, R. M. Synthesis of Optically Active a-Amino Acids, Pergamon Press, Oxford, 1989.
28. 3. Duthaler, R. O. Tetrahedron 1994, 50, 1539; Coopla, G. M.; Schuster, M. F. Asymmetric Synthesis using Amino Acids, John Wiley, New York, 1987; Monaghan, D. T.; Bridges, R. J.; Cotman, C. W. Annu. Rev. Pharmacol. Toxicol. 1989, 29, 365.; Johnson, G.; Bigge, C. F. Annu. Reports. Med. Chem. 1991, 26, 11; Williams, R. M. Synthesis of Optically Active a-Amino Acids, Pergamon Press, Oxford, 1989.
29. 3. Duthaler, R. O. Tetrahedron 1994, 50, 1539; Coopla, G. M.; Schuster, M. F. Asymmetric Synthesis using Amino Acids, John Wiley, New York, 1987; Monaghan, D. T.; Bridges, R. J.; Cotman, C. W. Annu. Rev. Pharmacol. Toxicol. 1989, 29, 365.; Johnson, G.; Bigge, C. F. Annu. Reports. Med. Chem. 1991, 26, 11; Williams, R. M. Synthesis of Optically Active a-Amino Acids, Pergamon Press, Oxford, 1989.
30. 3. Duthaler, R. O. Tetrahedron 1994, 50, 1539; Coopla, G. M.; Schuster, M. F. Asymmetric Synthesis using Amino Acids, John Wiley, New York, 1987; Monaghan, D. T.; Bridges, R. J.; Cotman, C. W. Annu. Rev. Pharmacol. Toxicol. 1989, 29, 365.; Johnson, G.; Bigge, C. F. Annu. Reports. Med. Chem. 1991, 26, 11; Williams, R. M. Synthesis of Optically Active a-Amino Acids, Pergamon Press, Oxford, 1989.
31. 4. Kotha, S.; Brahmachary, E. Tetrahedron Lett. 1997, 38, 3561.
32. 5. Mazaleyrat, J-P.; Gaucher, A.; Goubard, Y.; Savrda, J.; Wakselman, M. Tetrahedron Lett. 1997, 38, 2091.
33. 6. Portion of this work was presented at (i) Indo-Gennan Symposium: Organic Synthesis-Growing Interface with Adjacent Sciences, Hyderabad, Indian Institute of Chemical Technology, September 27-28, 1996: Kotha, S.; Brahmachary, E.; Sreenivasachary, N., Synthesis of Unnatural α -Amino Acids, Abstract No: P-16; (ii) Group Monitoring Workshop on DST-Funded Projects in Organic Chemistry, Bangalore, Indian Institute of Science, March 28, 1997, Kotha, S.; Development of New Methodologies for the Synthesis of Unusual α-Amino Acids, (iii) 6th National Organic Symposium Trust Meeting, Lonavala, April 20-23,1997: Kotha, S.; Brahmachary, E.; Sreenivasachary, N.; Chakraborthy, K.; Giridharan, G., Synthesis of Non-Coded α-Amino Acids via Building Block Approach.
34. 6. Portion of this work was presented at (i) Indo-Gennan Symposium: Organic Synthesis-Growing Interface with Adjacent Sciences, Hyderabad, Indian Institute of Chemical Technology, September 27-28, 1996: Kotha, S.; Brahmachary, E.; Sreenivasachary, N., Synthesis of Unnatural α -Amino Acids, Abstract No: P-16; (ii) Group Monitoring Workshop on DST-Funded Projects in Organic Chemistry, Bangalore, Indian Institute of Science, March 28, 1997, Kotha, S.; Development of New Methodologies for the Synthesis of Unusual α-Amino Acids, (iii) 6th National Organic Symposium Trust Meeting, Lonavala, April 20-23,1997: Kotha, S.; Brahmachary, E.; Sreenivasachary, N.; Chakraborthy, K.; Giridharan, G., Synthesis of Non-Coded α-Amino Acids via Building Block Approach.
35. 6. Portion of this work was presented at (i) Indo-Gennan Symposium: Organic Synthesis-Growing Interface with Adjacent Sciences, Hyderabad, Indian Institute of Chemical Technology, September 27-28, 1996: Kotha, S.; Brahmachary, E.; Sreenivasachary, N., Synthesis of Unnatural α -Amino Acids, Abstract No: P-16; (ii) Group Monitoring Workshop on DST-Funded Projects in Organic Chemistry, Bangalore, Indian Institute of Science, March 28, 1997, Kotha, S.; Development of New Methodologies for the Synthesis of Unusual α-Amino Acids, (iii) 6th National Organic Symposium Trust Meeting, Lonavala, April 20-23,1997: Kotha, S.; Brahmachary, E.; Sreenivasachary, N.; Chakraborthy, K.; Giridharan, G., Synthesis of Non-Coded α-Amino Acids via Building Block Approach.
36. 7. Grubbs, R. H.; Miller, S. J.; Fu, G. C. Acc. Chem. Res. 1995, 28, 446; Schmalz, H. G. Angew. Chem., Int. Ed. Engl. 1996, 34, 1833; Furstner, A.; Langemann, K. Synthesis 1997, 792.
37. 7. Grubbs, R. H.; Miller, S. J.; Fu, G. C. Acc. Chem. Res. 1995, 28, 446; Schmalz, H. G. Angew. Chem., Int. Ed. Engl. 1996, 34, 1833; Furstner, A.; Langemann, K. Synthesis 1997, 792.
38. 7. Grubbs, R. H.; Miller, S. J.; Fu, G. C. Acc. Chem. Res. 1995, 28, 446; Schmalz, H. G. Angew. Chem., Int. Ed. Engl. 1996, 34, 1833; Furstner, A.; Langemann, K. Synthesis 1997, 792.
39. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
40. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
41. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
42. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
43. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
44. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
45. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
46. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
47. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
48. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
49. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
50. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
51. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
52. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
53. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
54. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
55. 8. For some recent references related to ring-closing metathesis reaction see: Clark, J. S.; Kettle, J. G. Tetrahedron Lett. 1997, 38, 127; Rutjes, F. P. J.; Schoemaker, H. E. Tetahedron Lett. 1997, 38, 677; Shoo, Y. -S.; Lee, T. R. Tetrahedron Lett. 1997, 38, 1283; Chang, S.; Grubbs, R. H. Tetrahedron Lett. 1997, 38, 4757; Dias, E. L.; Nguyen, S. T.; Grubbs, R. H. J. Am. Chem. Soc. 1997, 119, 3887; Snapper, M. L.; Tallarico, J. A.; Randall, M. L. J. Am. Chem. Soc., 1997, 119, 1478; Taylor, R. E.; Haley, J. D. Tetrahedron Lett. 1997, 38, 2061; Dyatkin, A. B. Tetrahedron Lett. 1997, 38, 2065; Boger, D. L.; Chai, W.; Ozer, R. S.; Anderson, C. -M. Bioorganic & Med. Chem. Lett. 1997, 7, 463; Delgado, M.; Martin, J. D.; Tetrahedron Lett. 1997, 6299; Barrett, A. G. M; Baugh, S. P. D.; Braddock, D. C.; Flack, K.; Gibson, V. C.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 1375; Schneider, M. F.; Lucas, N.; Velder, J.; Blechert, S. Angew. Chem., Int. Ed. Engl. 1997, 36, 257; Brummer, O.; Ruckert, A.; Blechert, S. Chem. Eur. J. 1997, 3, 441; Feng, J.; Schuster, M.; Blechert, S. Synlett 1997, 129.; Peters, J. -U.; Blechert, S. Synlett 1997, 348; Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 1101; Barrett, A. G. M.; Baugh, S. P. D.; Gibson, V. C.; Giles, M. R.; Marshall, E. L.; Procopiou, P. A. J. Chem. Soc., Chem. Commun. 1997, 155.
56. 9. Schollkopf, U.; Hoppe, D.; Jentsch, R. Angew. Chem., Int. Ed. Engl. 1971, 10, 331; Hoppe, D. Angew. Chem., Int. Ed. Engl. 1974, 13, 789.
57. 9. Schollkopf, U.; Hoppe, D.; Jentsch, R. Angew. Chem., Int. Ed. Engl. 1971, 10, 331; Hoppe, D. Angew. Chem., Int. Ed. Engl. 1974, 13, 789.