1: 76 percent / Li2CO3 / dimethylformamide / 3 h / 140 °C 2: 60 percent / xylene; propan-2-ol / 4 h / Ambient temperature; Irradiation 3: 1) LDA, 2) HMPA / 1) THF, hexane, -78 deg C, 1 h, 2) THF, a) -78 deg C, 1 h, b) -35 deg C, 45 min 4: 1M aq.NaOH / aq. ethanol / 0.75 h / Heating 5: Et3N / tetrahydrofuran / 3 h / 0 °C 6: 0.25 M aq.NaOH / 30 h / 50 °C 7: 80 percent / 30percent H2O2 / tetrahydrofuran / 1 h / Ambient temperature View Scheme