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(c) Jalil Miah, M. A.; Hudlicky, T.; Reed, J. W. In The Alkaloids; Brossi, A., Ed.; Academic Press: New York, 1998; Vol. 51, pp 199-269.
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4
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53849122002
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and references cited therein. For a recent total synthesis, see
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For a recent total synthesis, see: Hameed, A.; Blake, A. J.; Hayes, C. J. J. Org. Chem. 2008, 78, 8045, and references cited therein.
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5
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0023710154
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For possible transformation from 3 to 1 via an alternative pathway, see relevant total synthesis of cephalotaxine: a
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For possible transformation from 3 to 1 via an alternative pathway, see relevant total synthesis of cephalotaxine: (a) Kuehne, M. E.; Bornmann, W. G.; Parsons, W. R; Spitzer, T. D.; Blount, J. F.; Zubieta, J. J. Org. Chem. 1988, 53, 3439.
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(b) Planas, L.; Perard-Viret, J.; Royer, J. J. Org. Chem. 2004, 69, 3087.
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Ikeda, M.; Hirose, K.; El, Bialy, S. A. A.; Sato, T.; Yakura, T.; Bayoma, S. M. M. Chem. Pharm. Bull. 1998, 46, 1084.
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(f) Ikeda, M.; Hirose, K.; El, Bialy, S. A. A.; Sato, T.; Yakura, T.; Bayoma, S. M. M. Chem. Pharm. Bull. 1998, 46, 1084.
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0016756714
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(h) Semmelhack, M. F.; Chong, B. P.; Stauffer, R. D.; Rogerson, T. D.; Chong, A.; Jones, L. D. J. Am. Chem. Soc. 1975, 97, 2507.
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Yasuda, S.; Yamada, T.; Hanoka, M. Tetrahedron Lett. 1986, 27, 2023.
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64249153728
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3CN, DMSO, rt → reflux (Figure presented)
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3CN, DMSO, rt → reflux (Figure presented)
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19
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64249162877
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2;. Viscous brown jelly was produced during the course of the following reaction (Figure presented)
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2;. Viscous brown jelly was produced during the course of the following reaction (Figure presented)
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20
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24944434374
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For reported acid-lactonization reaction of γ-en-carboxylate, see: a
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For reported acid-lactonization reaction of γ-en-carboxylate, see: (a) Amonkar, C. P.; Tuve, S. G.; Parameswaran, P. S. Synthesis 2005, 14, 2341.
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Amonkar, C.P.1
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26
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1342302796
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Considerable difficulty was encountered in finding conditions suitable for the base-catalvzed aldol condensation of keto-aldehvde intermediate. Among the conditions (K2CO3/MeOH, KOH/MeOH, prolini/EtOH, proline/DMSO) examined, the only effective one was the KOtBu/THF system, which furnished the amino spirocvclopentenone 3a. For information on this svstem, see: Freiria, M, Whitehead, A. J, Tocher, D. A, Motherwell. W. B. Tetrahedron 2004, 60, 2673
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tBu/THF system, which furnished the amino spirocvclopentenone 3a. For information on this svstem, see: Freiria, M.; Whitehead, A. J.; Tocher, D. A.; Motherwell. W. B. Tetrahedron 2004, 60, 2673.
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