title: First synthesis of the two enantiomers of alpha-methyldiphenylalanine [(alphaMe)Dip] by HPLC resolution.
abstract: A strategy for the preparation of enantiomerically pure (R)- and (S)-alpha-methyldiphenylalanine, constrained phenylalanine analogs, is described. A racemic precursor was prepared in high yield from easily available starting products and subjected to HPLC resolution on a noncommercial chiral stationary phase. More than 600 mg of each enantiomer was isolated in optically pure form by using a 150 x 20 mm ID column containing mixed 10-undecenoate/3,5-dimethylphenylcarbamate of cellulose covalently bonded to allylsilica gel and a mixture of n-hexane/2-propanol/acetone as the mobile phase.
authors.affiliation: Departamento de Química Orgánica, ICMA, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain.
authors.forename: Soledad
authors.initials: S
authors.lastname: Royo
authors.forename: Pilar
authors.initials: P
authors.lastname: López
authors.forename: Ana I
authors.initials: AI
authors.lastname: Jiménez
authors.forename: Laureano
authors.initials: L
authors.lastname: Oliveros
authors.forename: Carlos
authors.initials: C
authors.lastname: Cativiela