potassium carbonate in methanol 2 h; Ambient temperature;

1: 1.) a) C2H5Br, Mg, 2.) Et3N / 1.) a) Et2O, from RT to reflux, 30 min, b) reflux, 1 h, 2.) THF, reflux, overnight 2: 99 percent / aq. K2CO3 / methanol / 2 h / Ambient temperature View Scheme