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6. For 3-aza-5-hexenyl radical cyclization see: Della, E. W.; Knill, A. M. J. Org. Chem. 1996, 61, 7529. Dittami, J. P.; Ramanathan, H. Tetrahedron Lett. 1988, 29, 45. Knight, J.; Parsons, P. J.; Southgate, R. J. Chem. Soc. Chem. Commun. 1986, 78. Padwa, A.; Nimmesgern, H.; Wong, G. S. K. Tetrahedron Lett. 1985, 26, 957.
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7. For 4-aza-5-hexenyl radical cyclization see: Lee, E.; Kang, T. S.; Joo, B. J.; Tae, J. S.; Li, K. S.; Chung, C. K. Tetrahedron Lett. 1995, 36, 417. Ziegler, F. E.; Jeroncic, L. O. J. Org. Chem. 1991, 56, 3479. Beckwith, A. L. J.; Westwood, S. W. Tetrahedron 1989 45, 5269.
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7. For 4-aza-5-hexenyl radical cyclization see: Lee, E.; Kang, T. S.; Joo, B. J.; Tae, J. S.; Li, K. S.; Chung, C. K. Tetrahedron Lett. 1995, 36, 417. Ziegler, F. E.; Jeroncic, L. O. J. Org. Chem. 1991, 56, 3479. Beckwith, A. L. J.; Westwood, S. W. Tetrahedron 1989 45, 5269.
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7. For 4-aza-5-hexenyl radical cyclization see: Lee, E.; Kang, T. S.; Joo, B. J.; Tae, J. S.; Li, K. S.; Chung, C. K. Tetrahedron Lett. 1995, 36, 417. Ziegler, F. E.; Jeroncic, L. O. J. Org. Chem. 1991, 56, 3479. Beckwith, A. L. J.; Westwood, S. W. Tetrahedron 1989 45, 5269.
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8. For 5-aza-5-hexenyl radical cyclization see: Bowman, W. R.; Stephenson, P. T.; Terrett, N. K.; Young, A. R. Tetrahedron 1995, 51, 7959. Tomaszewski, M. J.; Warkentin, J. Tetrahedron Lett. 1992, 33, 2123.
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8. For 5-aza-5-hexenyl radical cyclization see: Bowman, W. R.; Stephenson, P. T.; Terrett, N. K.; Young, A. R. Tetrahedron 1995, 51, 7959. Tomaszewski, M. J.; Warkentin, J. Tetrahedron Lett. 1992, 33, 2123.
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9. For 6-aza-5-hexenyl radical cyclization see: Bowman, W. R.; Stephenson, P. T.; Young, A. R. Tetrahedron Lett. 1995 36, 5623. Sturino, C. F.; Fallis, A. G. J. Org. Chem. 1994, 59, 6514.
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0010690401
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14. Compound 4d has previously been prepared by reductive 3-aza-5-hexenyl radical cyclization. However, we were unable to confirm the assignment of the major isomer as trans-4d. Watanabe, Y., Ueno, Y.; Tanaka, C.; Okawara, M.; Endo, T. Tetrahedron Lett. 1987, 28, 3953.
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