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2942626370
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note
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The stereochemical assignment at C14 was also based on extensive literature precedent (see for example refs 3a and 3c).
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46
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2942624661
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note
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3 gave lower yields.
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47
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2942589439
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note
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The loss of isomer 15 with respect to 14 is probably due to the instability of the corresponding epoxide.
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48
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2942619245
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note
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N2′ displacement by organocopper reagents is well documented, to our knowledge the ring-opening of vinyl oxiranes by alcohols in the presence of Lewis acid according to such a process is unprecedented.
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50
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2942566795
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note
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Attempts to achieve direct palladium- or rhodium-mediated allylic cleavage were unsuccessful. Details will be given in the full account of this work.
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51
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note
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The full description of the X-ray structure of 19 has been deposited with the Cambridge Crystallographic Data Centre, UK.
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52
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33644528891
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Dess, D. B.; Martin, J. C. J. Org. Chem. 1983, 48, 4155. Meyer, S. D.; Schreiber, S. L. J. Org. Chem. 1994, 59, 7549.
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note
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The spectra of 18, 20, and 2 were compared with the copies of NMR spectra published as Supporting Information by Snider and co-workers (ref 3c).
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