References and Notes
1. For recent excellent reviews on the clerodane diterpenoids and related compounds including marine natural products, see: (a) Faulkner, D. J. Nat. Prod. Rep. 2002, 19, 1. (b) Capon, R. J. Eur. J. Org. Chem. 2001, 633. (c) Tokoroyama, T. Synthesis 2000, 611. (d) Capon, R. J. In Studies in Natural Products Chemistry; Atta-ur-Rahman., Ed.; Elsevier Science B.V.: Amsterdam, 1995; Vol. 15, p 289. 2. Djura, P.; Stierle, D. B.; Sullivan, B.; Faulkner, D. J.; Arnold, E.; Clardy, J. J. Org. Chem. 1980, 45, 1435. 3. Ciminiello, P.; Dell'Aversano, C.; Fattorusso, E.; Magno, S.; Pansini, M. J. Nat. Prod. 2000, 63, 263. 4. Longley, R. E.; McConnell, O. J.; Essich, E.; Harmody, D. J. Nat. Prod. 1993, 56, 915. 5. Wright, A. E.; Cross, S. S.; Burres, N. S.; Koehn, F. (Harbor Branch Oceanographics Institution, Inc., USA). PCT WO 9112250 A1, August 22, 1991. 6. It was reported that aureol (1) was isolated in 0.036% yield (dry weight) from the marine sponge Smenospongia aurea, see ref. 2. 7. Letcher, R. M.; Yue, T. Y.; Chiu, K. F.; Kelkar, A. S.; Cheung, K. K. J. Chem. Soc., Perkin Trans. 1 1998, 3267. 8. Schmitz, F. J.; Lakshmi, V.; Powell, D. R.; van der Helm, D. J. Org. Chem. 1984, 49, 241. 9. Carte, B.; Rose, C. B.; Faulkner, D. J. J. Org. Chem. 1985, 50, 2785. 10. (a) Urban, S.; Capon, R. J. Aust. J. Chem. 1994, 47, 1023. (b) Urban, S.; Capon, R. J. J. Nat. Prod. 1992, 55, 1638. (c) Capon, R. J. J. Nat. Prod. 1990, 53, 753. 11. In 2001, Waldmann and co-workers reported an analogous rearrangement reaction in their total synthesis of nakijiquinones, novel marine sesquiterpene quinones. In this work, the rearrangement products related to 1 and 3 were regarded as undesired and useless products; therefore, detailed information regarding the stereoselectivity, yield, and reaction conditions for this rearrangement was not given. See: Stahl, P.; Kissau, L.; Mazitschek, R.; Huwe, A.; Furet, P.; Giannis, A.; Waldmann, H. J. Am. Chem. Soc. 2001, 123, 11586. 12. Lakshmi, V.; Gunasekera, S. P.; Schmitz, F. J.; Ji, X., van der Helm, D. J. Org. Chem. 1990, 55, 4709. 13. Nakamura, M.; Suzuki, A.; Nakatani, M.; Fuchikami, T.; Inoue, M.; Katoh, T. Tetrahedron Lett. 2002, 43, 6929. 14. (a) Katoh, T.; Nakatani, M.; Shikita, S.; Sampe, R.; Ishiwata, A.; Ohmori, O.; Nakamura, M.; Terashima, S. Org. Lett. 2001, 3, 2701. (b) Kawano, H.; Itoh, M.; Katoh, T.; Terashima, S. Tetrahedron Lett. 1997, 38, 7769. 15. Takai, K.; Hotta, Y.; Oshima, K.; Nozaki, H. Bull. Chem. Soc. Jpn. 1980, 53, 1698. 16. Piers, E.; Breau, M. L.; Han, Y.; Plourde, G. L.; Yeh, W.-L. J. Chem. Soc., Perkin Trans. 1 1995, 963. 17. (a) Suzuki, A.; Nakatani, M.; Nakamura, M.; Kawaguchi, K.; Inoue, M.; Katoh, T. Synlett 2003, 329. (b) Nakatani, M.; Nakamura, M.; Suzuki, A.; Inoue, M.; Katoh, T. Org. Lett. 2002,
