1: 1M NaOH / methanol / 0.08 h 2: 1.) CH2Cl2, N,N-dimethylformamide dimethylacetal, reflux, 12 h, 2.) acetic anhydride, reflux, 1 h 3: 88 percent / Na, NH3 / diethyl ether / 0.5 h / -78 °C View Scheme