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For an alternate synthesis of β-amino acids using oxazolidinones see: E. Arvanitis, H. Ernst, A. A. Ludwig, A. J. Robinson and P. B. Wyatt, J. Chem. Soc., Perkin Trans. 1, 1998, 521; also
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For other selected methods for the synthesis of substituted succinates see: (a) C.-B. Xue, X. He, J. Roderick, W. F. DeGrado, R. J. Cherney, K. D. Hardman, D. J. Nelson, R. A. Copeland, B. D. Jatfee and C. P. Decicco, J. Med. Chem., 1998, 41, 1745;
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The use of diphenylphosphoryl azide for the Curtius rearrangement gave lower yields and product purification was also difficult.
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33645943490
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The diastereomers were purified by silica gel column chromatography. The two diastereomers from compound 7e were inseparable on column chromatography.
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The diastereomers were purified by silica gel column chromatography. The two diastereomers from compound 7e were inseparable on column chromatography.
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33645905816
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The absolute stereochemistry of the alkylation product 7a was established by removal of both carboxy protecting groups to yield benzyl succinic acid and comparison of its sign of rotation with that reported in the literature (see Experimental section).
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The absolute stereochemistry of the alkylation product 7a was established by removal of both carboxy protecting groups to yield benzyl succinic acid and comparison of its sign of rotation with that reported in the literature (see Experimental section).
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26 + 5.33 (c 1.0, MeOH).
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26 + 5.33 (c 1.0, MeOH).
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75
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33645905516
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The acid 12e was purified to a single diastereomer by crystallization.
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The acid 12e was purified to a single diastereomer by crystallization.
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