title: Derivatization, complexation, and absolute configurational assignment of chiral primary amines: application of exciton-coupled circular dichroism.
abstract: We report here a sensitive method for the determination of the absolute configurations of primary amines using exciton-coupled circular dichroism (ECCD). The method works on a microgram scale by derivatization of chiral amines with quinoline chromophores. Complexation of the chiral ligands with metal ion fixes the geometry of the chromophores, resulting in a twist that is governed by the asymmetric carbon configuration and steric environment of the amine. The absolute configurations of the primary amines can be interpreted from the couplets of the ECCD spectra of the derivatized complexes. Crystal structures, 2D NMR studies, and semiempirical calculations provide structural evidence for our model.
authors.affiliation: Department of Chemistry, New York University, New York, NY 10003, USA.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.forename: Andrea E
authors.initials: AE
authors.lastname: Holmes
authors.forename: Akanksha
authors.initials: A
authors.lastname: Sharma
authors.forename: Neil R
authors.initials: NR
authors.lastname: Brooks
authors.forename: Randy S
authors.initials: RS
authors.lastname: Rarig
authors.forename: Jon
authors.initials: J
authors.lastname: Zubieta
authors.forename: James W
authors.initials: JW
authors.lastname: Canary