Polyfunctional isocytosine derivatives: II. Regioselectivity of methylation of 2-(2-hydroxyethylamino)-6-methylpyrimidin-4(3H)-one in different media
摘要:
High regioselectivity in the methylation of 2-(2-hydroxyethylamino)-6-methylpyrimidin-4(3H)C, one at the N-3 atom in water and ethanol in the presence of inorganic bases is determined by participation of the oxygen atom in hydrogen bonding and its coordination to metal cation, respectively. In going to aprotic dimethylformamide which is capable of solvating cations, the regioselectivity decreases, and a mixture of N-3- and O-methyl isomers is formed.