1: 30 percent / pyridine / 1 h / Ambient temperature 2: 70 percent / K2CO3 / acetone 3: 26 percent / aq. NaOH / methanol / 24 h / Ambient temperature 4: 78 percent / H2O; methanol / 5 h / 60 °C View Scheme

1: 43 percent / aq. NaOH / methanol / 24 h / Ambient temperature 2: 80 percent / H2O; methanol / 5 h / 60 °C View Scheme