title: Aminations of guanosine and deoxyguanosine with hydroxylamine-O-sulfonic acid and 2,4-dinitrophenoxyamine. Dependence on the reaction medium.
abstract: Amination of guanosine (Guo) with 2,4-dinitrophenoxyamine in aqueous DMF gave 7-amino-Guo, which was readily converted to 8,5'-O-cyclo-Guo, and 8-hydroxy-Guo. Deoxyguanosine (dG) gave only deglycosylated 7-amino-G under the same reaction condition. Aminations of Guo and dG with hydroxylamine-O-sulfonic acid above pH 9 gave the corresponding 1-amino derivatives, whereas those in acidic media at pH 2-4 gave 8-amino-Guo and 7-amino-G as the main products, respectively. Amination of Guo in neutral media gave 1-amino-Guo and decomposed products of 7-amino-Guo. The mechanisms of these amination reactions are described.
mesh_terms: D003849:Deoxyguanosine / Q000031:analogs & derivatives*; D006151:Guanosine / Q000031:analogs & derivatives*; D006863:Hydrogen-Ion Concentration; D006898:Hydroxylamines; D007202:Indicators and Reagents; D007700:Kinetics; D013329:Structure-Activity Relationship
chemical_list: D006898:Hydroxylamines; D007202:Indicators and Reagents; D006151:Guanosine; C008042:hydroxylamine-O-sulfonic acid; D003849:Deoxyguanosine; C050904:O-(2,4-dinitrophenyl)hydroxylamine