title: Substituent effects on the enantioselective retention of anti-HIV 5-aryl-delta 2-1,2,4-oxadiazolines on R,R-DACH-DNB chiral stationary phase.
abstract: A series of racemic 3-phenyl-4-(1-adamantyl)-5-X-phenyl- delta 2-1,2,4-oxadiazo lines (PAdOx) were directly resolved by HPLC using a Pirkle-type stationary phase containing N,N'-(3,5-dinitrobenzoyl)-1(R),2(R)-diaminocyclohexane as chiral selector. The more retained enantiomers have S configuration, as demonstrated by X-ray crystallography and circular dichroism measurements. The influence of aromatic ring substituents on enantioselective retention was quantitatively assessed by traditional linear free energy-related (LFER) equations and comparative molecular field analysis (CoMFA). In good agreement with previous findings, the results from this study indicate that the increase in retention (k') is favoured mainly by the phi-basicity and the hydrophilicity of solute, whereas enantioselectivity (alpha) can be satisfactorily modeled by electronic and bulk parameters or CoMFA descriptors. The LFER equations and CoMFA models gave helpful insights into chiral recognition mechanisms.
authors.affiliation: Dipartimento Farmaco-Chimico, Università di Bari, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Altomare
authors.forename: S
authors.initials: S
authors.lastname: Cellamare
authors.forename: A
authors.initials: A
authors.lastname: Carotti
authors.forename: M L
authors.initials: ML
authors.lastname: Barreca
authors.forename: A
authors.initials: A
authors.lastname: Chimirri
authors.forename: A M
authors.initials: AM
authors.lastname: Monforte
authors.forename: F
authors.initials: F
authors.lastname: Gasparrini
authors.forename: C
authors.initials: C
authors.lastname: Villani
authors.forename: M
authors.initials: M
authors.lastname: Cirilli
authors.forename: F
authors.initials: F
authors.lastname: Mazza
mesh_terms: D019380:Anti-HIV Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000302:isolation & purification*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D018360:Crystallography, X-Ray; D003514:Cyclohexylamines; D015394:Molecular Structure; D009579:Nitrobenzoates; D010069:Oxadiazoles / Q000138:chemical synthesis / Q000737:chemistry / Q000302:isolation & purification*; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D019380:Anti-HIV Agents; D003514:Cyclohexylamines; D009579:Nitrobenzoates; D010069:Oxadiazoles; C094607:N,N'-(3,5-dinitrobenzoyl)-1,2-diaminocyclohexane