title: Determination of the absolute configuration of a chiral oxadiazol-3-one calcium channel blocker, resolved using chiral chromatography, via concerted density functional theory calculations of its vibrational circular dichroism, electronic circular dichroism, and optical rotation.
abstract: The chiral oxadiazol-3-one 2 has recently been shown to exhibit myocardial calcium entry channel blocking activity, substantially higher than that of diltiazem. To determine the enantioselectivity of this activity, the enantiomers of 2 have been resolved using chiral chromatography. The absolute configuration (AC) of 2 has been determined by comparison of density functional theory (DFT) calculations of its vibrational circular dichroism (VCD) spectrum, electronic circular dichroism (ECD) spectrum, and optical rotation (OR) to experimental VCD, ECD, and OR data. All three chiroptical properties yield identical ACs; the AC of 2 is unambiguously determined to be S(+)/R(-).
authors.affiliation: Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482, USA. pstephen@usc.edu
authors.forename: P J
authors.initials: PJ
authors.lastname: Stephens
authors.forename: F J
authors.initials: FJ
authors.lastname: Devlin
authors.forename: F
authors.initials: F
authors.lastname: Gasparrini
authors.forename: A
authors.initials: A
authors.lastname: Ciogli
authors.forename: D
authors.initials: D
authors.lastname: Spinelli
authors.forename: B
authors.initials: B
authors.lastname: Cosimelli
mesh_terms: D002121:Calcium Channel Blockers / Q000737:chemistry*; D002845:Chromatography; D002942:Circular Dichroism; D004583:Electrons; D008958:Models, Molecular; D008968:Molecular Conformation; D009904:Optical Rotation; D010069:Oxadiazoles / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013237:Stereoisomerism; D014732:Vibration
chemical_list: D002121:Calcium Channel Blockers; D010069:Oxadiazoles; C522526:oxadiazol-3-one