title: A new amino acid derivative with a masked side-chain aldehyde and its use in peptide synthesis and chemoselective ligation.
abstract: A new amino acid derivative with a diol side-chain, L-2-amino-4,5-dihydroxy-pentanoic acid (Adi), has been prepared from L-allylglycine by suitable protection, for use in peptide synthesis, as Fmoc-L-Adi(Trt)2. This building block enables the introduction of a side-chain aldehyde at any position in a given peptide sequence without use of specialized side-chain protection schemes. The aldehyde is revealed by mild oxidation with sodium periodate, circumventing the problematic release of reactive peptidic aldehydes in TFA solution. Peptides with aldehyde side-chains are useful for chemo-selective ligation, reacting selectively with oxyamines to yield oxime links, while all other peptide functions can be left unprotected. The utility of the new building block has been demonstrated by the synthesis of peptide dimers and a cyclo-peptide.
authors.affiliation: Novo Nordisk A/S, Bagsvaerd, Denmark.
authors.forename: J C
authors.initials: JC
authors.lastname: Spetzler
authors.forename: T
authors.initials: T
authors.lastname: Hoeg-Jensen
mesh_terms: D000447:Aldehydes / Q000737:chemistry; D000595:Amino Acid Sequence; D000596:Amino Acids / Q000138:chemical synthesis* / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D019281:Dimerization; D007202:Indicators and Reagents; D015394:Molecular Structure; D010455:Peptides / Q000138:chemical synthesis* / Q000737:chemistry; D010456:Peptides, Cyclic / Q000138:chemical synthesis / Q000737:chemistry; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: C451744:2-amino-4,5-dihydroxypentanoic acid; D000447:Aldehydes; D000596:Amino Acids; D007202:Indicators and Reagents; D010455:Peptides; D010456:Peptides, Cyclic