title: Peptides by extension at the N- or C-terminii of lysine.
abstract: Dipeptides 3a-g, (3a + 3a'), (3d + 3d'), (3l + 3l')a and tripeptides 6a-e, (6b + 6b'), (6e + 6e') incorporating Z(epsilon)-Lys were prepared in high yields (70-95%) and enantiopurity (> or =97%) in partially aqueous acetonitrile solution by coupling using (i) Z(epsilon)-Lys with N-(Z- and Fmoc-aminoacyl)benzotriazoles 1a-g, (ii) Z(epsilon)-Lys with N-Z-dipeptidoylbenzotriazoles 5a-c, and (iii) N-Fmoc(alpha)-Z(epsilon)-l-Lys-Bt 1h and amino acids 2a,c-e. Unnatural dipeptides 3h-j, (3h + 3h') and tripeptides 6f were similarly prepared from Z(alpha)-Lys. Retention of chirality was demonstrated by parallel experiments involving l-Ala, dl-Ala, l-Met, and dl-Met by NMR and HPLC analysis.
authors.affiliation: Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, FL 32611-7200, USA. katritzky@chem.ufl.edu
authors.forename: Alan R
authors.initials: AR
authors.lastname: Katritzky
authors.forename: Geeta
authors.initials: G
authors.lastname: Meher
authors.forename: Parul
authors.initials: P
authors.lastname: Angrish
mesh_terms: D000097:Acetonitriles / Q000737:chemistry; D004151:Dipeptides / Q000138:chemical synthesis* / Q000737:chemistry; D008239:Lysine / Q000737:chemistry*; D009842:Oligopeptides / Q000138:chemical synthesis* / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D000097:Acetonitriles; D004151:Dipeptides; D009842:Oligopeptides; D012996:Solutions; D008239:Lysine; C032159:acetonitrile