1: With sodium methylate in methanol 0.5 h; Reflux; 2: With sodium tetrahydroborate in methanol T=20°C; 0.25 h; Reflux;

1.1: caesium carbonate / N,N-dimethyl-formamide / 3 h / 60 °C 2.1: sodium methylate / methanol / 0.5 h / Reflux 2.2: 0.25 h / 20 °C / Reflux View Scheme