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Beilstein J. Org. Chem. 2017, 13, 2316–2325, doi:10.3762/bjoc.13.228
Graphical Abstract
Figure 1: Examples of conformationally biased amino acids [1-10]. Compound 6 is a target of this work.
Scheme 1: The first synthetic approach.
Scheme 2: The second synthetic approach.
Scheme 3: The third synthetic approach.
Scheme 4: The fourth synthetic approach (partially reproduced from ref. [17]).
Figure 2: Selected J values and the inferred molecular conformations of 6a and 6b.