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28
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0002764629
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the authors suggest a two-step mechanism including a reverse Cope elimination
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For cyclization of other α-allenylhydroxylamines to 3,6-dihydro-1,2-oxazine derivatives, see: E. Dumez, J.-P. Dulcére, Chem. Commun. 1998, 479-480; the authors suggest a two-step mechanism including a reverse Cope elimination.
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0027994561
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Synthesis: A. Dondoni, S. Franco, F. Junquera, F. L. Merchán, P. Merino, T. Tejero, Synth. Commun. 1994, 24, 2537-2550.
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Tejero, T.6
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30
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0344184922
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note
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2Ph), 54.4 (q, OMe), 26.4, 25.4 (2 q, Me).
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31
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0344184923
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note
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The byproduct may be formed by a retro-cne type reaction of the primary adduct. In several examples benzaldehyde oxime could be detected, which probably arises from nitrosomethylbenzene.
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32
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0001101886
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Under these conditions compound 10a was converted into 11a with a synlanti ratio of approximately 70:30. For the discussion of the influence of protecting groups on the diastercoselectivity of serine derived nitrones see: P. Merino, S. Franco, F. L. Merchan, T. Tejero, J. Org. Chem. 1998, 63, 5627-5630.
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J. Org. Chem.
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Merino, P.1
Franco, S.2
Merchan, F.L.3
Tejero, T.4
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33
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0344616476
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note
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The assignment is now proved by an X-ray crystal structure analysis of a subsequent product of anti-6b.
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