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26
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9644263297
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note
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2 at-30 °C. The starting aldehydes I (n = 0, 1, 2, 3) have been reported in the literature,
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27
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3142725214
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(i) For aldehydes I, n = 0, see: Geyde, R. N.; Aura, P. C.; Deck, K. Can. J. Chem. 1971, 49, 1764.
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(1971)
Can. J. Chem.
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Geyde, R.N.1
Aura, P.C.2
Deck, K.3
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28
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0029044475
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(ii) For aldehyde I, n = 1, see: Fernández-Mateos, A.; Lopéz Barba, A. J. Org. Chem. 1995, 60, 3580.
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J. Org. Chem.
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Fernández-Mateos, A.1
Lopéz Barba, A.2
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29
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0001350277
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(iii) For aldehyde I, n = 2, see: Fernández-Mateos, A.; Pascual Coca, G.; Rubio González, R.; Tapia Hernández, C. J. Org. Chem. 1996, 61, 9097.
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J. Org. Chem.
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Fernández-Mateos, A.1
Pascual Coca, G.2
Rubio González, R.3
Tapia Hernández, C.4
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30
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9644264781
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note
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4 (60%) in THF. All compounds synthesized are racemic, although only one enantiomer is depicted (Figure 3).
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31
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9644290187
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note
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(b) The epoxyketones 6-9 were obtained by a three-step sequence from the aldehydes I, n = 0, 1, 2, 3:
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32
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9644271776
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note
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i) Grignard reaction with vinyl magnesium bromide,
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33
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9644308657
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note
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ii) oxidation with Dess-Martin reagent,
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34
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9644259835
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note
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and iii) epoxidation with mCPBA.
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35
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84986694101
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(c) The structure of epoxyketones 6-10, in which the oxiranic oxygen and the side chain is cis, is based on spectroscopic data and comparison with the epoxy compound described by K. Mori et al., whose structure was determined by X-ray. See: Mori, K.; Aki, S.; Kido, M. Liebigs Ann. Chem. 1993, 83. Equation Presented
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(1993)
Liebigs Ann. Chem.
, pp. 83
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Mori, K.1
Aki, S.2
Kido, M.3
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36
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9644265998
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note
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2O. After removal of the solvent, the crude product was purified by flash chromatography. All homolytic cleavages were absolutely selective and always afforded the tertiary radical.
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37
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9644271775
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note
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+]: 280.2038. Found: 280.2033.
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38
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0037060957
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Moisan, L.; Hardouin, C.; Rousseau, B.; Doris, E. Tetrahedron Lett. 2001, 43, 2013.
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(2001)
Tetrahedron Lett.
, vol.43
, pp. 2013
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Moisan, L.1
Hardouin, C.2
Rousseau, B.3
Doris, E.4
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39
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9644304907
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note
-
The diastereomer the 6 afforded exclusively bicyclic diol 6a′ in 70% yield (Scheme 6). Equation Presentation
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