1: 72 percent / MeONa / methanol / 0.5 h / Heating 2: 30 percent / TsOH / benzene / 3.5 h / Heating 3: 53 percent / n-butyllithium / hexane; tetrahydrofuran / 0.17 h / -78 °C 4: 82 percent / dimethylformamide / 4 h / 100 °C 5: 93 percent / 2 N HCl / acetone / 2 h / 60 °C / via hydrochloride 6: 23 mg / MCPBA / CH2Cl2 / 0.17 h / 0 °C View Scheme