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2842540027
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note
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3, PPTS, MeOH] followed by cyclisation, resulted in a poor overall yield of 1a (25%).
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28
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2842556686
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note
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2Me), followed by a three-step procedure leading to the required bicyclic oxazolidmone.
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30
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2842551128
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note
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The geometries of the initial states were optimised by using the Davidson-Fletcher-Powell algorithm (FLEPO procedure), minimising the energy with respect to all internal coordinates. Approximate transition states were obtained from the energy profiles in a reaction path (the reaction coordinates being the distance between the carbon atom of C=N and the reactive terminal carbon atom of the allylsilane), then the transition states were optimised by minimising the energy gradient (NLLSQ procedure).
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31
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0842341771
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2842607804
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note
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[24c] The optical rotation of naturally occuring sample of xenovenine has not been determined so far because of its scarcity.
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40
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2842594457
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note
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Compound 1a was equally prepared by refluxing 5 in MeOH in 39% yield. The spectral data of 1'a were deduced by difference with those of 1a.
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42
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0003591694
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Chemical Crystallography Laboratory, Oxford, UK
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43
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2842593355
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note
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Crystallographic data (excluding structure factors) for the structures reported in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication no CCDC-101210. Copies of the data can be obtained free of charge on application to CCDC, 12 Union Road, Cambridge CB2 1EZ. UK [fax: int. code + 44-(1223)336-033, e-mail: deposit@ccdc.cam.ac.uk].
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