1: 90 percent / pyridine / CH2Cl2 / 0.17 h / 0 °C 2: 80 percent / tetrahydrofuran / 1 h / Ambient temperature 3: 91 percent / K2CO3 / methanol / 2 h / Ambient temperature 4: 80 percent / H2 / 20percent Pd(OH)2 on charcoal / ethanol View Scheme