title: Separation, conformation in solution and absolute configuration of ethopropazine enantiomers.
abstract: Enantiomers of ethopropazine x HCl (10-(2-diethylaminopropyl)phenothiazine hydrochloride) were prepared by fractional crystallization of diastereomeric dibenzoyltartaric acid salts, and their optical purity (enantiomeric excess, ee) determined by HPLC on Chiralcel OJ column. With a solvent mixture n-hexane/t-butanol/triethylamine (100:3:0.5) as eluent a very good enantioseparation (alpha = 1.68) for racemic ethopropazine was obtained. Enantiomeric purity for (-)-enantiomer was 99.1% and for (+)-enantiomer 97.9%. Combined data from NMR and CD spectra of both enantiomers, along with previously reported X-ray structure analyses of racemic ethopropazine, revealed skewed conformation of tricyclic system in solution, and (S)-configuration on the stereogenic center for (-)-enantiomer, and (R)-configuration for (+)-enantiomer.
authors.affiliation: Institute for Medical Research and Occupational Health, Zagreb, Croatia.
authors.forename: Goran
authors.initials: G
authors.lastname: Sinko
authors.forename: Predrag
authors.initials: P
authors.lastname: Novak
authors.forename: Dinko
authors.initials: D
authors.lastname: Ziher
authors.forename: Vladimir
authors.initials: V
authors.lastname: Vinković
authors.forename: Vitomir
authors.initials: V
authors.lastname: Sunjić
authors.forename: Vera
authors.initials: V
authors.lastname: Simeon-Rudolf
mesh_terms: D014150:Antipsychotic Agents / Q000737:chemistry / Q000302:isolation & purification*; D002851:Chromatography, High Pressure Liquid; D002942:Circular Dichroism; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D009904:Optical Rotation; D010640:Phenothiazines / Q000737:chemistry / Q000302:isolation & purification*; D013237:Stereoisomerism
chemical_list: D014150:Antipsychotic Agents; D010640:Phenothiazines; C084820:profenamine