1: 70 percent / K2CO3 / 3.5 h / 50 °C 2: 1.) aq. NaOH, 2.) acetic anhydride / 1.) MeOH, 3 d, 2.) reflux, 2 h 3: 75 percent / 72 h 4: 62 percent / CF3COOH / various solvent(s) / 1 h 5: 25percent aq. NH4OH / 1 h View Scheme

1: 75 percent / 72 h 2: 62 percent / CF3COOH / various solvent(s) / 1 h 3: 25percent aq. NH4OH / 1 h View Scheme

1: 1.) aq. NaOH, 2.) acetic anhydride / 1.) MeOH, 3 d, 2.) reflux, 2 h 2: 75 percent / 72 h 3: 62 percent / CF3COOH / various solvent(s) / 1 h 4: 25percent aq. NH4OH / 1 h View Scheme

1: 62 percent / CF3COOH / various solvent(s) / 1 h 2: 25percent aq. NH4OH / 1 h View Scheme

ammonium hydroxide 1 h;