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0011807527
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note
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4 and concentrated in vacuo. Purification by flush column chromatography (hexane:ethyl acetate = 5:1 as an eluent) gave ethyl 2-hydroxy-3-phenyl-3-(4-methoxyphenylamino)-propionate (29.9 mg, 80%) as a colorless oil.
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22
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0011847270
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note
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4 indicated the stereochemistry.
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23
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0011905301
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note
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1H NMR (NOESY) after transforming into the corresponding imidazolidinone as in the following typical example, in which the anti-isomer showed correlation, whereas the syn-analogue did a very weak correlation:
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