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16044367169
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note
-
The absolute configuration of the β-amino esters 2b,c,d,f,i,k,m was ascertained by comparison of spectroscopic data of confrontable β-amino esters of known configuration.
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16044364584
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note
-
The conformations were fully explored and minimized using the MM+ force field of the Hyper Chem package, from Hyper Cube Inc., Waterloo, Ontario, Canada.
-
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57
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16044369225
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Kagan, H. B., Ed.; Georg Thieme Publishers: Stuttgart
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Generally, the α- and β-amino acids rotate polarized light in the same direction of the relative methyl or ethyl esters: (a) Jacques, J.; Gros, C.; Bourcier, S. In Stereochemistry; Kagan, H. B., Ed.; Georg Thieme Publishers: Stuttgart, 1977; Vol. 4, p 107. (b) Yamada, T.; Kuwata, S.; Watanabe, H. Tetrahedron Lett. 1978, 1813.
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0006599511
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Generally, the α- and β-amino acids rotate polarized light in the same direction of the relative methyl or ethyl esters: (a) Jacques, J.; Gros, C.; Bourcier, S. In Stereochemistry; Kagan, H. B., Ed.; Georg Thieme Publishers: Stuttgart, 1977; Vol. 4, p 107. (b) Yamada, T.; Kuwata, S.; Watanabe, H. Tetrahedron Lett. 1978, 1813.
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-
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16044369504
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note
-
The β-amino esters 3a,b,d,e, as N-1-naphthoyl derivatives, were analyzed on a S,S-Whelk 01 column (purchased from Regis Chemical Co., Morton Grove, IL), 250 × 4.6 mm i.d., hexane-isopropanol 70:30 (v/v) as eluent, UV 254 nm detector. Elution order: L before D.
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