1: 88 percent / Et3N / CH2Cl2 / 14 h / Ambient temperature 2: 1) NaOEt, 2) 10percent HCl / 1) ethanol, 2 h, reflux, 2) 0.5 h, RT 3: 60 percent / NaH / tetrahydrofuran / 12 h / Ambient temperature View Scheme