title: Characterization of novel nucleoside analogs by electrospray ionization mass spectra.
abstract: In this paper, we synthesized a novel nucleoside analog by coupling thymine with dimethyl dicarboxylate biphenyl (DDB). The structure of the target compound was determined using 1H nuclear magnetic resonance (NMR) and electrospray ionization tandem mass spectrometry (ESI-MS/MS). The fragmentation pathways were studied in details through ESI-MS/MS. By comparing with unsubstituted nucleosides, such as AZT, MCI, d4T and DDI, it was found that the nucleoside analog coupled with DDB would not yield the daughter ions corresponding to the fragments of the nucleoside base and arabinofuranose analogs, but would lose a neutral molecule HF and DDB easily. However, the unsubstituted nucleosides could lightly yield the fragment ions of the nucleoside base and sugar ring. Hence, electrospray ionization mass spectrometry combined with tandem mass spectrometry (MS/MS) provides a convenient method to recognize the substituted and unsubstituted nucleosides.
authors.affiliation: The Key Laboratory for Chemical Biology of Fujian Province, Department of Chemistry, Xiamen University, Xiamen, 361005, PR China.
authors.forename: Liu
authors.initials: L
authors.lastname: Yan
authors.forename: Chen
authors.initials: C
authors.lastname: Xiao-Lan
authors.forename: He
authors.initials: H
authors.lastname: Juan
authors.forename: Hou
authors.initials: H
authors.lastname: Jian-Bo
authors.forename: Qu
authors.initials: Q
authors.lastname: Ling-Bo
authors.forename: Zhao
authors.initials: Z
authors.lastname: Yu-Fen
mesh_terms: D004149:Dioxoles / Q000737:chemistry; D011741:Pyrimidine Nucleosides / Q000138:chemical synthesis / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D004149:Dioxoles; D011741:Pyrimidine Nucleosides; C041398:7,7'-dimethoxy-(4,4'-bi-1,3-benzodioxole)-5,5'-dicarboxylic acid dimethyl ester