title: Fluorogenic derivatization of aryl halides based on the formation of biphenyl by Suzuki coupling reaction with phenylboronic acid.
abstract: The fluorogenic derivatization method for aryl halide was developed for the first time. This method was based on the formation of fluorescent biphenyl structure by Suzuki coupling reaction between aryl halides and non-fluorescent phenylboronic acid (PBA). We measured the fluorescence spectra of the products obtained by the reaction of p-substituted aryl bromides (i.e., 4-bromobenzonitrile, 4-bromoanisole, 4-bromobenzoic acid ethyl ester and 4-bromotoluene) with PBA in the presence of palladium (II) acetate as a catalyst. The significant fluorescence at excitation maximum wavelength of 275-290 nm and emission maximum wavelength of 315-350 nm was detected in all the tested aryl bromides. This result demonstrated that non-fluorescent aryl bromides could be converted to the fluorescent biphenyl derivatives by the coupling reaction with non-fluorescent PBA. We tried to determine these aryl bromides by HPLC-fluorescence detection with pre-column derivatization. The aryl bromide derivatives were detected on the chromatogram within 30 min without any interfering peak derived from the reagent blank. The detection limits (S/N=3) for aryl bromides were 13-157 fmol/injection.
authors.affiliation: Graduate School of Biomedical Sciences, Course of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.
authors.forename: Naoya
authors.initials: N
authors.lastname: Kishikawa
authors.forename: Kimiko
authors.initials: K
authors.lastname: Kubo
authors.forename: Sherin Farouk
authors.initials: SF
authors.lastname: Hammad
authors.forename: Mokhtar Mohamed
authors.initials: MM
authors.lastname: Mabrouk
authors.forename: Ahmed
authors.initials: A
authors.lastname: Habib
authors.forename: Hamed
authors.initials: H
authors.lastname: Elfatatry
authors.forename: Kaname
authors.initials: K
authors.lastname: Ohyama
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Nakashima
authors.forename: Naotaka
authors.initials: N
authors.lastname: Kuroda
mesh_terms: D001555:Benzene Derivatives / Q000737:chemistry*; D001713:Biphenyl Compounds / Q000737:chemistry*; D001897:Boronic Acids / Q000737:chemistry*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D001555:Benzene Derivatives; D001713:Biphenyl Compounds; D001897:Boronic Acids; D005456:Fluorescent Dyes; C010574:biphenyl; C010686:benzeneboronic acid