title: 2,4-Dimethyl-5(4H)-oxazolone as reagent for activation and coupling of N-substituted aspartic acid.
abstract: Reaction of the title oxazolone with N-benzyloxycarbonyl-L-aspartic acid in dichloromethane followed by addition of phenylalanine methyl ester.HCl and N-methylmorpholine gave a 90% yield of a mixture of alpha- and beta-isomers of Z-aspartylphenylalanine methyl esters in a 7:3 ratio. Reaction of the oxazolone with N-acetyl-L-aspartic acid anhydride gave a 75% yield of crystalline N-acetyl-L-aspartic acid anhydride. tert-Butoxycarbonylaspartic and Z-glutamic acids also underwent activation to give the anhydrides.
authors.affiliation: Department of Biochemistry, University of Ottawa, Ontario, Canada.
authors.forename: N L
authors.initials: NL
authors.lastname: Benoiton
authors.forename: F M
authors.initials: FM
authors.lastname: Chen
mesh_terms: D001224:Aspartic Acid / Q000737:chemistry*; D007202:Indicators and Reagents; D010081:Oxazolone / Q000031:analogs & derivatives* / Q000737:chemistry
chemical_list: C090715:2,4-dimethyl-5(4H)-oxazolone; D007202:Indicators and Reagents; D010081:Oxazolone; D001224:Aspartic Acid