TY - JOUR
T1 - Dimeric Building Blocks for Solid-Phase Synthesis of α-Peptide-β-Peptoid Chimeras
AU - Seigan, Gitte Bonke
AU - Vedel, Line
AU - Matthias, Witt,
AU - Jaroszewski, Jerzy W.
AU - Olsen, Christian Adam
AU - Franzyk, Henrik
PY - 2008
Y1 - 2008
N2 - Recently, a novel type of antimicrobial and proteolytically stable peptidomimetic oligomers having an α-peptide-β-peptoid chimeric backbone was reported. The present paper describes efficient protocols for the preparation of a wide range of dimeric building blocks, displaying different types of side-chains, for use in solid-phase synthesis (SPS) of libraries of this type of oligomers. The β-peptoid monomers were obtained by microwave-assisted aza-Michael additions to acrylic esters. Subsequent solution-phase peptide coupling with suitably protected α-amino acids afforded dimeric intermediates. Even sluggish peptide couplings, involving sterically hindered N-alkyl-β-alanines or amino acids with bulky side-chains, gave high yields on multigram-scale when using microwave (MW) irradiation. Protecting group and side-chain manipulations were performed as one-pot solution-phase procedures to afford ten different building blocks in good to excellent yields. Finally, the efficiency of SPS oligomerization of a representative dimer was demonstrated by preparing 10- to 16-residue homomers and by the assembly of four different building blocks to give a diversely functionalized octamer.
AB - Recently, a novel type of antimicrobial and proteolytically stable peptidomimetic oligomers having an α-peptide-β-peptoid chimeric backbone was reported. The present paper describes efficient protocols for the preparation of a wide range of dimeric building blocks, displaying different types of side-chains, for use in solid-phase synthesis (SPS) of libraries of this type of oligomers. The β-peptoid monomers were obtained by microwave-assisted aza-Michael additions to acrylic esters. Subsequent solution-phase peptide coupling with suitably protected α-amino acids afforded dimeric intermediates. Even sluggish peptide couplings, involving sterically hindered N-alkyl-β-alanines or amino acids with bulky side-chains, gave high yields on multigram-scale when using microwave (MW) irradiation. Protecting group and side-chain manipulations were performed as one-pot solution-phase procedures to afford ten different building blocks in good to excellent yields. Finally, the efficiency of SPS oligomerization of a representative dimer was demonstrated by preparing 10- to 16-residue homomers and by the assembly of four different building blocks to give a diversely functionalized octamer.
KW - Former Faculty of Pharmaceutical Sciences
U2 - 10.1055/s-2008-1067171
DO - 10.1055/s-2008-1067171
M3 - Journal article
SN - 0039-7881
VL - 2008
SP - 2381
EP - 2390
JO - Synthesis
JF - Synthesis
IS - 15
ER -