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. Author manuscript; available in PMC: 2009 Dec 5.
Published in final edited form as: J Org Chem. 2008 Dec 5;73(23):9228–9234. doi: 10.1021/jo8012429

Table 2.

Relevant Literature Examples

Anti Compound Parent AA δHa (JAX) δHb (JBX) Syn Compound δHa (JAX) δHb (JBX) Ref
25a Leucine 2.34 (7.9) 2.27 (3.4) 25b 2.48 (2.9) 2.29 (10.0) 28
26a Valine NA NA 26b 2.58 (2.9) 2.47 (9.1) 29
27a Valine NA NA 27b 2.64 (2.1) 2.32 (10.6) 28
28a Isoleucine NA NA 27b 2.60 (2.7) 2.48 (9.1) 30
29a Isoleucine NA NA 29b 2.60 (2.7) 2.42 (8.7) 30
30a Phenylalanine 2.40 (9.5) 2.04 (2.4) 30b 2.63 (2.5) 2.22 (10.1) 28
31a Phenylalanine 2.59 (9.9) 2.37 (2.6) 31b NA NA 31
32a Phenylalanine 2.57 (10.3) 2.38 (3.0) 32b NA NA 31
33a Phenylalanine 2.54 (9.8) 2.28 (3.1) 33b NA NA 32
34a Phenylalanine 2.38 (9.0) 2.19 (4.0) 34b NA NA 32
35a Phenylalanine 2.55 (9.5) 2.32 (3.0) 35b NA NA 32
36a Isoleucine NA NA 36b 3.25 (1)a 2.44 (8.1) 8
37a Isoleucine NA NA 37b 3.25 (2.7) 2.48 (7.5) 8
38a Hydroxyglutamic acid 2.62 (8.8) 2.54 (5.0) 38b 2.74 (3.7) 2.69 (10.5) 33
39a Hydroxyglutamic acid 2.65 (9.2) 2.55 (4.6) 39b NA NA 33
40a Hydroxyglutamic acid NA NA 40b 2.62, m 33
41a Phenylalanine NA NA 41b 2.65 (3.6) 2.57 (5.6) 34
42a (DMSO) Tryptophan NA NA 42b 2.35 (3.7) 2.28 (9.1) 35
43a (DMSO) Tyrosine NA NA 41b 2.38 (3.7) 2.29 (9.5) 36
44a (MeOH) Leucine 2.36 (7.2) 2.27 (6.7) NA NA NA 37
a

broad proton signal with no discernable coupling to Hx that for illustrative purposes is considered approximately a 1 Hz coupling.