1: KOCl / dioxane / 1) 4 deg C, 1h, 2) RT 2: tetrahydrofuran / 48 h 3: 1) 0.10M HCl, 2) 2.0M NaOH / 1) CH3CN, RT, 18h, 2) 70 deg C, 15 min View Scheme