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26
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34547135879
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note
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Determined by GC analysis.
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27
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34547100707
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note
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In ref. 11, the experimental details were not described and the obtained alkylated piperidine β-amino esters were only partially characterized. Moreover, the optical rotation values have been mistakenly reported as positive, and must be read as negative.
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30
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34547097967
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note
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A similar result was obtained for pyrrolidine homologue alkylation: see ref. 9.
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31
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34547099769
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note
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The procedure was improved by the successful purification of 1 by a very short column filtration on silica gel (AcOEt) with a similar yield (87%).
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32
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85085631771
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note
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2 as the catalyst.
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33
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85085632334
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note
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10
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34
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34547138346
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note
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The reaction was also conducted starting from enantiopure piperidine (4a) to afford pure compound (5a).
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35
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85085632487
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note
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2/C catalyzed hydrogenation (0.15 equiv in weight) of 1 was also carried out with a similar diastereoselectivity, provided that two additions of the catalyst were performed successively (0.05 equiv for 12h and 0.10 equiv for 3h).
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