sodium chlorite; sodium dihydrogenphosphate; water in tert-butyl alcohol T=0 - 25°C;

tetrahydrofuran; diethyl ether

hydrogenchloride

1: 2,4-dimethoxy-pyrimidine-5-carboxylic acid With 1,1'-carbonyldiimidazole in N,N-dimethyl-formamide T=0 - 20°C; 5 h; 2: With triethylamine; 1,1'-carbonyldiimidazole in N,N-dimethyl-formamide 3: methanol 2 h; Heating / reflux;