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25
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85031228466
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note
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We thank Shiratori Pharmaceutical Co., Ltd. for a gift of DMC.
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26
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85031233629
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note
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Iminophosphorane 3 was isolable after flash chromatography on silica gel column; however, it was hygroscopic and hydrolyzed gradually to the starting amide 2.
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27
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85031219936
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note
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These new compounds had satisfactory spectral and analytical data for the given structures. The assigned stereochemistry was based on the fact that no racemization was found to occur during the condensation with use of DEPC (ref. 11) and the intramolecular aza-Wittig reaction (ref. 5).
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28
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85031232692
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note
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3, s).
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29
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85031222373
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note
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3, 200MHz) signal at δ 9.73 (1H, NHCO, br).
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30
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85031227990
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note
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2, respectively.
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