title: Synthesis of the fully protected phosphoramidite of the benzene-DNA adduct, N2-(4-Hydroxyphenyl)-2'-deoxyguanosine and incorporation of the later into DNA oligomers.
abstract: N(2)- (4-Hydroxyphenyl)-2'-deoxyguanosine-5'-O-DMT-3'-phosphoramidite has been synthesized and used to incorporate the N(2)-(4-hydroxyphenyl)-2'-dG (N(2)-4-HOPh-dG) into DNA, using solid-state synthesis technology. The key step to obtaining the xenonucleoside is a palladium (Xantphos-chelated) catalyzed N(2)-arylation (Buchwald-Hartwig reaction) of a fully protected 2'-deoxyguanosine derivative by 4-isobutyryloxybromobenzene. The reaction proceeded in good yield and the adduct was converted to the required 5'-O-DMT-3'-O-phosphoramidite by standard methods. The latter was used to synthesize oligodeoxynucleotides in which the N(2)-4-HOPh-dG adduct was incorporated site-specifically. The oligomers were purified by reverse-phase HPLC. Enzymatic hydrolysis and HPLC analysis confirmed the presence of this adduct in the oligomers.
authors.affiliation: Monogram Biosciences Inc, South San Francisco, California, USA.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Chenna
authors.forename: Ramesh C
authors.initials: RC
authors.lastname: Gupta
authors.forename: Radha R
authors.initials: RR
authors.lastname: Bonala
authors.forename: Francis
authors.initials: F
authors.lastname: Johnson
authors.forename: Bo
authors.initials: B
authors.lastname: Hang
mesh_terms: D001554:Benzene / Q000737:chemistry*; D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D018736:DNA Adducts / Q000737:chemistry*; D008956:Models, Chemical; D015394:Molecular Structure; D009838:Oligodeoxyribonucleotides / Q000737:chemistry*; D009943:Organophosphorus Compounds / Q000138:chemical synthesis*; D010165:Palladium / Q000737:chemistry
chemical_list: D018736:DNA Adducts; D009838:Oligodeoxyribonucleotides; D009943:Organophosphorus Compounds; C434331:phosphoramidite; D010165:Palladium; D001554:Benzene