Abstract
Fmoc-N-Protected β-amino acids of (S)-configuration bearing the side chains of Ala, Val, Leu, and Phe in the 3- and 2-position have been prepared. Manual solid-phase synthesis (ortho-chlorotrityl-chloride resin) of the β-heptapeptides H-β3-HVal-β3-HAla-β3-HLeu-β3-HPhe-β3-HVal-β3-HAla-β3-HLeu-OH and H-β2-HVal-β2-HAla-β2-HLeu-β2-HPhe-β2-HVal-β2-HAla-β2-HLeu-OH, and, for comparison, of the corresponding α-heptapeptide H-Val-Ala-Leu-Phe-Val-Ala-Leu-OH was achieved under standard conditions (HPLC/NMR identification). With H-β3-HVal-β3-HAla-β3-HLeu-β3-HPhe-β3-HVal-β3-HAla-β3-HLeu-OH, the yield and purity of the crude product are similar to those of H-Val-Ala-Leu-Phe-Val-Ala-Leu-OH, while the β2 synthesis needs to be optimized. CD measurements show that the β-peptides have helical secondary structures in MeOH, while the α-peptide does not.
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