potassium carbonate in N,N-dimethyl-formamide T=85 - 90°C; Etherification; 33 h;

1.1: NaNO2 / 1-methyl-pyrrolidin-2-one / 0.67 h / 165 - 170 °C 1.2: 52 percent / potassium carbonate / 1-methyl-pyrrolidin-2-one / 0.75 h / 150 - 160 °C 2.1: 42.1 percent / K2CO3 / dimethylformamide / 33 h / 85 - 90 °C View Scheme