title: Improved scalable syntheses of mono- and bis-urethane derivatives of ornithine.
abstract: In the search for a practical route to ornithine bisurethane derivatives useful for peptide synthesis, we elaborated the simple and efficient (86% yield) synthesis of N(epsilon)-tert-butoxycarbonyl-L-ornithine copper(II) complex (1). This served as substrate for obtaining N(epsilon)-tert-butoxycarbonyl-L-ornithine (2), N(alpha)-benzyloxycarbonyl-N(epsilon)-tert-butoxycarbonyl-L-ornithine (3) and N(alpha)-(9-fluorenyl)methoxycarbonyl-N(epsilon)-tert-butoxycarbonyl-L-ornithine (4). These were synthesized in 94-95% yields and with a purity above 99%.
authors.affiliation: Laboratory of Chemistry, Technical University of Opole, Poland.
authors.forename: S
authors.initials: S
authors.lastname: Wiejak
authors.forename: E
authors.initials: E
authors.lastname: Masiukiewicz
authors.forename: B
authors.initials: B
authors.lastname: Rzeszotarsk
mesh_terms: D002152:Calorimetry, Differential Scanning; D002851:Chromatography, High Pressure Liquid; D003300:Copper; D007202:Indicators and Reagents; D009952:Ornithine / Q000031:analogs & derivatives* / Q000138:chemical synthesis; D014520:Urethane / Q000031:analogs & derivatives* / Q000138:chemical synthesis
chemical_list: D007202:Indicators and Reagents; D014520:Urethane; D003300:Copper; D009952:Ornithine