1. For a recent review on the preparation and properties of azepines: Proctor, G. R.; Redpath, J. In The Chemistry of Heterocyclic Compounds; Taylor, E. C., Ed. Monocyclic azepines. Wiley-Interscience Publication: Chichester, 1996; Vol. 56.
2. (a) Noguchi, M.; Yamada, H.; Takamura, S.; Uchida, T.; Hironaka, M.; Kakehi, A.; Yamamoto, H. Eur. J. Org. Chem. 2000, 1489–1496.
3. (b) Noguchi, M.; Yamada, H.; Takamura, S.; Okada, K.; Kakehi, A.; Yamamoto, H. Tetrahedron 2000, 56, 1299–1307 and references cited therein.
4. Fuji, T.; Ohba, M.; Sakari, M.; Matsubara, S. Chem. Pharm. Bull. 1990, 38, 2702–2706 and references cited therein.
5. Preparation and physical properties of vinamidine derivatives including 10a: Kamimura, A.; Sato, E.; Kanayama, D.; Noguchi, M., unpublished data.