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Precursor 9 was obtained after silylation (91%) of the corresponding meso alcohol, obtained after complete equatorial alkylation of the symmetric ketone (85%), see: Polo, C.; Ramos, V.; Torroba, T.; Rodriguez, M. L.; Bossis, R.; Marcaccini, S.; Pepino, R. Heterocycles 1991, 32, 1757-1762.
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Crystallographic data for 4b have been deposited at the Cambridge Crystallographic Data Centre (File CCDC 145900).
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46
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85037508848
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3 solvent of a NMR tube) and rearranged to acyclic substrate 16. (equation presented)
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