in trifluoroacetic acid 0 deg C, 30 min, then reflux 70 h; Title compound not separated from byproducts;

1: 95 percent / triethylamine / hexane / ice-water bath, then room temperature, 1 h 2: 1) 30 percent (CF3CO)2O; 2) KOH / 1) CF3COOH, 56 deg C, 75 h; 2) MeOH, room temperature View Scheme

potassium hydroxide 1) CF3COOH, 0 deg C, 30 min, then reflux 70 h; 2) MeOH, room temperature; Yield given. Multistep reaction. Yields of byproduct given;