trifluoroacetic acid in 1,2-dichloro-ethane 2.5 h; Heating;

1: 1) n-BuLi / 1) THF, hexane, -15 deg C, 5 min, 2) THF, -40 deg C, 1h 2: 60 percent / trifluoroacetic acid / 1,2-dichloro-ethane / 2.5 h / Heating View Scheme

sodium hydroxide in methanol 2 h; Heating;