trifluoroacetic acid in methanol; water

1: 78 percent / barium oxide, barium hydroxide octahydrate / dimethylformamide / 16 h 2: 80.65 percent / trifluoroacetic acid / methanol; H2O View Scheme

1: 1. BF3*Et2O 2. trimethylsilyl trifluoromethanesulfonate / 1. CH2Cl2, room temperature 2. 1,2-dichloroethane 2: NaOCH3 / methanol 3: 3 g / p-TosOH / acetone / 1 h / Heating 4: barium hydroxide, barium oxide / dimethylformamide 5: 1.89 g / amberlyst 15 (H+) / methanol; H2O / 6 h / Ambient temperature View Scheme

1: 4.6 g / pyridine 2: 1. BF3*Et2O 2. trimethylsilyl trifluoromethanesulfonate / 1. CH2Cl2, room temperature 2. 1,2-dichloroethane 3: NaOCH3 / methanol 4: 3 g / p-TosOH / acetone / 1 h / Heating 5: barium hydroxide, barium oxide / dimethylformamide 6: 1.89 g / amberlyst 15 (H+) / methanol; H2O / 6 h / Ambient temperature View Scheme

1: NaOCH3 / methanol 2: 3 g / p-TosOH / acetone / 1 h / Heating 3: barium hydroxide, barium oxide / dimethylformamide 4: 1.89 g / amberlyst 15 (H+) / methanol; H2O / 6 h / Ambient temperature View Scheme

1: 3 g / p-TosOH / acetone / 1 h / Heating 2: barium hydroxide, barium oxide / dimethylformamide 3: 1.89 g / amberlyst 15 (H+) / methanol; H2O / 6 h / Ambient temperature View Scheme

1: 78 percent / barium oxide, barium hydroxide octahydrate / dimethylformamide / 16 h 2: 80.65 percent / trifluoroacetic acid / methanol; H2O View Scheme

tetra-(n-butyl)ammonium iodide; di(n-butyl)tin oxide in benzene 24 h; Heating;