1: ethyl acetate 2: 1) SOCl2 / 1) CHCl3, 45 deg C, 5 h, 2) CHCl3, reflux, 48 h 3: 80 percent / 1N HCl / methanol / 2 h / Heating View Scheme

1: ethyl acetate 2: 1) SOCl2 / 1) CHCl3, 45 deg C, 5 h, 2) CHCl3, reflux, 48 h 3: 80 percent / 1N HCl / methanol / 2 h / Heating 4: 80 percent / aq. K2CO3 / methanol / 12 h / 23 °C View Scheme