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Beilstein J. Org. Chem. 2011, 7, 1304–1309, doi:10.3762/bjoc.7.152
Graphical Abstract
Figure 1: 2-Aminoisobutyric acid (Aib).
Scheme 1: Alkylation of L-alanine.
Scheme 2: Determining enantiomeric purity and absolute configuration of 6*.
Figure 2: Portion of 13C NMR spectrum of 7 showing 2.1:1 ratio of diastereoisomeric isotopomers.
Figure 3: Portion of 13C NMR spectrum of 8 showing location of 13C label in the less shielded methyl group.
Figure 4: Portion of 1H NMR spectrum of 8 showing greater 1JHC coupling in the less shielded methyl group.