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;

methanediazonium ion Yield given. Multistep reaction;

2,2,6,6-tetramethylpiperidinyl-lithium 1.) ether, 0 deg C, 10 min 2.) ether, r.t.; Yield given. Multistep reaction;