1: 3-(methoxymethyloxy)pyridine With n-butyllithium; N,N,N',N,-tetramethylethylenediamine in tetrahydrofuran; diethyl ether T=-78°C; 2 h; 2: formic acid methyl ester in tetrahydrofuran; diethyl ether T=-78 - 20°C; 8 h; Acidic aqueous solution;

1: 3-(methoxymethyloxy)pyridine With n-butyllithium; N,N,N',N,-tetramethylethylenediamine in diethyl ether; hexane T=-70°C; 3 h; Cooling with 2-propanol/dry ice bath; 2: N,N-dimethyl-formamide in diethyl ether; hexane T=-70 - 20°C; 3: With citric acid in diethyl ether; hexane; water T=0°C; 2 h;