1: 74 percent / 10percent aq. NaHCO3 / 6 h / 4 °C 2: 70 percent / Amberlite IR-120 H.C.P. resin (H+) / 24 h / Heating View Scheme

1.1: 75 percent / triethylamine / CHCl3 / 20 °C 2.1: 67 percent / TsOH / 40 h / Heating 3.1: thionyl chloride / CHCl3 / 48 h / Heating 3.2: 1 N HCl / methanol / 2 h / Heating 3.3: 49 percent / sodium hydrogen carbonate / methanol / 48 h / 20 °C 4.1: 80 percent / K2CO3 / methanol; H2O / 12 h / 25 °C View Scheme