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0012976174
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note
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The reason for low enantioselectivities in the case of N-halosuccinimide is not clear. The coordination of N-halosuccinimide and/or produced succinimide to zinc in 4 might change the ideal structure of the intermediate to lower the enatioselectivities.
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0012934975
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note
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If the intermediate 3 was produced completely by the reaction of alkylzinc moiety in 2 with aldoxime, the kind of alkyl group in dialkylzinc would not influence the chemical yield and enantio-selectivity. The fact that those were altered depending on the used dialkylzinc might indicate the incompletion of the reaction of methyl- and ethylzinc moiety in 2 with aldoxime.
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20
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0013011934
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Recently we found a concentration effect for the 1,3-dipolar cycloaddition of a nitrone to give the corresponding isoxazolidines with higher enantioselectivity in higher chemical yield: D. Xia, Y. Ukaji, S. Fujinami, and K. Inomata, Chem. Lett., 2002, 302.
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Chem. Lett.
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0012928203
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note
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3. Purification by column chromatography on silica gel afforded 2-isoxazoline 5a (227 mg, 76%) in 93% ee.
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