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for an elegant synthesis of Vineomycinone B2 via the formation of a C ring by a Bradsher-type [4+2]-heterocycloaddition, see: V. Bollitt, C. Mioskowski, R. O. Kollah, S. Manna, D. Rajapaksa, J. R. Falck, J. Am. Chem. Soc. 2001, 123, 6937-6938.
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c) for an elegant synthesis of Vineomycinone B2 via the formation of a C ring by a Bradsher-type [4+2]-heterocycloaddition, see: V. Bollitt, C. Mioskowski, R. O. Kollah, S. Manna, D. Rajapaksa, J. R. Falck, J. Am. Chem. Soc. 2001, 123, 6937-6938.
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58649093787
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For a relevant approach to C-glycosylanthraquinone based on a 1,3-dipolar cycloaddition, see: F. M. Hausser, X. Hu, Org. Lett. 2002, 4, 977-978.
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58649121334
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The correct NMR analysis of compound 12 requires the use of deuterated chloroform stabilized on silver.
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The correct NMR analysis of compound 12 requires the use of deuterated chloroform stabilized on silver.
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28
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58649085309
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In this paper, adducts have been designed as endo or exo, whatever the mechanism concerted or not, For SnCl4-catalyzed reactions, a nonconcerted mechanism is presumed
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4-catalyzed reactions, a nonconcerted mechanism is presumed.
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30
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58649110464
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Global efficiency in the formation of adduct 14c appeared to be very dependent on the quality of the tin chloride used. Thus, yields can be severely limited by acid-catalyzed hydrolysis of enol ether 8, which produces a ketone that is barely separable from the adduct exo- 14c
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Global efficiency in the formation of adduct 14c appeared to be very dependent on the quality of the tin chloride used. Thus, yields can be severely limited by acid-catalyzed hydrolysis of enol ether 8, which produces a ketone that is barely separable from the adduct exo- 14c.
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31
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4-promoted cycloreversion of 14b at room temperature cannot be totally excluded.
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4-promoted cycloreversion of 14b at room temperature cannot be totally excluded.
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32
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58649098001
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Spartan, Wavefunction Inc., Irvine, CA 92612, U.S.A.
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Spartan, Wavefunction Inc., Irvine, CA 92612, U.S.A.
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36
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33847802730
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3 could be a more appropriate reagent for oxidation under the milder conditions of the putative borane.
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3 could be a more appropriate reagent for oxidation under the milder conditions of the putative borane.
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37
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37049104121
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