in dichloromethane 48 h; Ambient temperature;

1: 62 percent / H2O / acetone / 24 h / Ambient temperature 2: SOCl2, 2,6-lutidine / benzene / 5 h / Ambient temperature 3: 68.9 percent / CH2Cl2 / 48 h / Ambient temperature View Scheme

1: SOCl2, 2,6-lutidine / benzene / 5 h / Ambient temperature 2: 68.9 percent / CH2Cl2 / 48 h / Ambient temperature View Scheme

sodium carbonate; trifluoroacetic anhydride 1) CH2Cl2, r.t., 5 h; Yield given. Multistep reaction;