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CCDC 614698 and CCDC 614700 (3 and 15b) contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/ data_request/cif.
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33750619660
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note
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Enolate formation and subsequent elimination results in the formation of N-tosylsulfonamide, which then underwent conjugate addition to the vinyl sulfonium salt. Following a 1,3-proton shift and subsequent ring closure, the tosyl aziridine was obtained in 45 % yield. (Chemical Equation Presented)
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27
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0000635013
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For recent reviews, see: (Eds.: E. N. Jacobsen, A. Pfaltz, H. Yamamoto), Springer, Berlin
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35
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33750617999
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note
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Attempts to improve the diastereoselectivity through the reaction of aminal 14 with the chiral vinyl sulfonium salt 6 did not result in the formation of the desired aziridine 15. Enolization α to the imine 14 and subsequent conjugate addition of the enolate to the chiral vinyl sulfonium salt 6 gave an ylide, which underwent 1,3-proton shift and ring closure to form the α-cyclopropylimine 18. (Chemical Equation Presented)
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36
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0038644039
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For the shortest previously reported route to balanol (ten linear steps), see: a) A. Fürstner, O. R. Thiel, J. Org. Chem. 2000, 65, 1738-1742; Leading references to other total syntheses of balanol are contained therein.
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Fürstner, A.1
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