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29
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0037756368
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note
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3; however, the reaction was capricious due to problems associated with precipitation of Pd-metal.
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-
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30
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0034815578
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For a preliminary report ofthis work see: Hedley, S. J.; Moran, W. J.; Prenzel, A. H. G. P.; Price, D. A.; Harrity, J. P. A. Synlett 2001, 1596.
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31
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0038432849
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note
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As judged by chiral HPLC analysis of 10 and 14. The enantiomeric purity of compounds 8, 12, and 18 was inferred from these data.
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-
-
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32
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0034629504
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For a recent example see: Wu, J.; Hou, X.-L.; Dai, L.-X. J. Org. Chem. 2000, 65, 1344.
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33
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0029989537
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Aziridines bearing SES, Boc, Cbz, and Dpp N-substituents do not undergo cycloaddition and are recovered from the reaction mixture unchanged. In contrast, the more highly activated Ns-protected aziridines furnish a complex mixture of products possibly because of competing addition of the Pd-TMM complex to the aromatic ring: Holzapfel, C. W.; van der Merwe, T. Tetrahedron Lett. 1996, 37, 2307.
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33751499952
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(a) Evans, D. A.; Faul, M. M.; Bilodeau, M. T. J. Org. Chem. 1991, 56, 6744.
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Evans, D.A.1
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36
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11644312278
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37
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0029891381
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Only the major diastereomer is shown in each case in Scheme 7. The stereochemical assignment of cis- and trans-46 was not carried out due to the poor levels of selectivity observed in this case. The major epoxide diastereomer 43a was assigned based on the characteristic long-range coupling observed with one of the epoxide CH2 protons and a ring methylene proton (J = 1.5 Hz): Vedejs, E.; Dent, W. H., III; Kendall, J. T.; Oliver, P. A. J. Am. Chem. Soc. 1996, 118, 3556. Assignment of 44 is based on 2D ROESY, which is provided in the Supporting Information. Assignment of the major diastereomer of 45 is based on the coupling constants of the protons at C-5 and C-6, see Supporting Information for more details.
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Dent W.H. III2
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Oliver, P.A.4
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