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We gratefully acknowledge Professor R. Cambie for communications pertaining to the hamigerans.
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Nicolaou, K. C.; Gray, D.; Tae, J. Angew Chem., Int. Ed. 2001, 40, 3675-3678; Nicolaou, K. C.; Gray, D.; Tae, J. Angew Chem., Int. Ed. 2001, 40, 3679-3683. For a recent elegant total synthesis of hamigeran B, see: Clive, D. L. J.; Wang, J. Angew Chem., Int. Ed. 2003, 42, 3406-3409.
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We suspect that a trace contaminant in the commercial formulation of methyl crotonate might be catalyzing rapid decomposition of the dienophile upon photochemical irradiation in this reaction.
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We gratefully acknowledge Professor D. Buisson for his generous and timely gift of several fungal and yeast strains used in these experiments.
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Lipkowitz, K., Boyd, D., Eds.; VCH: New York
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The hamigeran diastereoisomeric pairs were modeled with Accelrys Insight II, 1998. Molecular dynamics calculations were performed with Accelrys Discover v. 2.98 on a cluster of SGI Origin servers running Irix 6.5. The relative energies of the diastereoisomeric were computed with the class II pairwise force field cff91 v. 2.0 (see: Dinur, U.; Hagler A. In Reviews in Computational Chemistry; Lipkowitz, K., Boyd, D., Eds.; VCH: New York, 1991; Vol. 2, p 527), with library parameters for bond, valence, torsion, and out-of-plane terms. A total of 1000 structures were generated within 300 ps at 800 K. They were annealed to 300 K in 5 ps. The structures were further minimized to convergence using a conjugate gradient algorithm, and the lowest energy structure cluster was selected as the preferred structure. We thank Dr. C. N. C. Boddy for performing these calculations.
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