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By using MeLi·LiBr for the deprotonation and BuLi for the transmetalation these two steps were decoupled. This results in an increased yield of the desired product of 15%. M. Hoffmann, H. Kessler, Tetrahedron Lett. 1997, 38, 1903-1906.
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31
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0642379574
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note
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In contrast to the previously described procedures, the reaction mixture was quenched with a ammonium chloride solution immediately after the addition of the aldehyde.
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32
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0027433943
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J. A. Stafford, M. F. Brackeen, D. S. Karanewsky, N. L. Valvano, Tetrahedron Lett. 1993, 34, 7873-7876.
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34
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0642318188
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note
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+ + Na].
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35
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0642318189
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note
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The coupling of the proton H-2, which can be easily assigned by DQF-COSY, with the proton H-1 was obtained from the total coupling of H-2 (width of the multiplet of the cross-peak) and the resulting value of about 8 Hz proves the β-configuration at C-1.
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